{"id":12350,"date":"2026-02-03T05:47:49","date_gmt":"2026-02-03T05:47:49","guid":{"rendered":"https:\/\/withcode.tech\/media\/?p=12350"},"modified":"2026-04-02T05:10:17","modified_gmt":"2026-04-02T05:10:17","slug":"webp_avif","status":"publish","type":"post","link":"https:\/\/withcode.tech\/media\/webp_avif\/","title":{"rendered":"WebP\/AVIF\u975e\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u5b9f\u88c5\uff5cpicture\u8981\u7d20\u3067\u753b\u50cf\u6700\u9069\u5316\u3092\u5fb9\u5e95\u89e3\u8aac"},"content":{"rendered":"<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.40.37.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u535a\u58eb\u3001\u6700\u8fd1WebP\u3084AVIF\u3063\u3066\u3044\u3046\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u3088\u304f\u805e\u304f\u3093\u3067\u3059\u3051\u3069\u3001\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u3067\u898b\u3089\u308c\u306a\u304f\u306a\u3063\u305f\u308a\u3057\u306a\u3044\u3093\u3067\u3057\u3087\u3046\u304b\uff1f<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u3088\u30fc\u304f\u805e\u304f\u3093\u3060\u305e\u3002WebP\u3084AVIF\u306f\u6b21\u4e16\u4ee3\u306e\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u3001\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u5927\u5e45\u306b\u524a\u6e1b\u3067\u304d\u308b\u3093\u3058\u3083\u3002\u3067\u3082\u78ba\u304b\u306b\u3001\u3059\u3079\u3066\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u3093\u3058\u3083\u3088\u3002\u3060\u304b\u3089\u3053\u305d\u3001\u4eca\u56de\u306f\u300c\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u300d\u3068\u3044\u3046\u6280\u8853\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u89e3\u8aac\u3059\u308b\u305e\u3044\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u305d\u3046\u3044\u3046\u65b9\u6cd5\u304c\u3042\u308b\u3093\u3067\u3059\u306d\uff01\u306f\u3044\uff01\u3088\u308d\u3057\u304f\u304a\u9858\u3044\u3057\u307e\u3059\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<p>Web\u30b5\u30a4\u30c8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6539\u5584\u306b\u304a\u3044\u3066\u3001\u753b\u50cf\u306e\u6700\u9069\u5316\u306f\u975e\u5e38\u306b\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u7279\u306b\u3001\u6b21\u4e16\u4ee3\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u3042\u308bWebP\u3084AVIF\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3057\u304b\u3057\u3001\u3053\u308c\u3089\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306f\u3059\u3079\u3066\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u305d\u3053\u3067\u91cd\u8981\u306b\u306a\u308b\u306e\u304c\u300c\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\uff08\u4ee3\u66ff\u8868\u793a\uff09\u300d\u306e\u5b9f\u88c5\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u672c\u8a18\u4e8b\u3067\u306f\u3001<strong><span 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class=\"is-style-icon_info\"><strong>\u4e2d\u7530\u3055\u3093<\/strong><br>\u90fd\u5185\u306e\u4f01\u696d\u306710\u5e74\u50cd\u304f\u3082\u3001\u91d1\u92ad\u9762\u30fb\u50cd\u304d\u65b9\u306b\u4e0d\u6e80\u3092\u6301\u3061\u3001\u526f\u696d\u3084\u8ee2\u8077\u3092\u8003\u3048\u308b\u3088\u3046\u306b\u306a\u308b\u3002\u300c\u5728\u5b85\u3067\u7a3c\u3052\u308b\u3088\u3046\u306b\u306a\u308a\u305f\u3044\u300d\u3068\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u306b\u306a\u308b\u3053\u3068\u3092\u6c7a\u610f\u3002\u77ed\u671f\u96c6\u4e2d\u3067\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u5b66\u7fd2\u306b\u30d5\u30eb\u30b3\u30df\u30c3\u30c8\u3057\u305f\u7d50\u679c\u3001\u5fa9\u8077\u5f8c3\u30f6\u6708\u3067\u9000\u793e\u2192\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u3068\u3057\u3066\u6d3b\u52d5\u3092\u958b\u59cb\u3059\u308b\u3002\u73fe\u5728\u306f\u3001\u5b50\u80b2\u3066\u306b\u53c2\u52a0\u3057\u306a\u304c\u3089\u3001\u5728\u5b85\u3067\u6848\u4ef6\u3092\u3053\u306a\u3057\u53ce\u5165\u3092\u5f97\u3089\u308c\u308b\u3088\u3046\u306b\u306a\u308b\u3002<\/p>\n\n\n\n<p>\u8a73\u3057\u304f\u306f<a href=\"https:\/\/withcode.tech\/media\/interview_1\/\" title=\"\">\u3053\u3061\u3089\u306e\u8a18\u4e8b<\/a>\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n<div class=\"swell-block-postLink\">\t\t\t<div class=\"p-blogCard -internal\" data-type=\"type1\" data-onclick=\"clickLink\">\n\t\t\t\t<div class=\"p-blogCard__inner\">\n\t\t\t\t\t<span class=\"p-blogCard__caption\">\u3042\u308f\u305b\u3066\u8aad\u307f\u305f\u3044<\/span>\n\t\t\t\t\t<div class=\"p-blogCard__thumb c-postThumb\"><figure class=\"c-postThumb__figure\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/02\/\u30a4\u30f3\u30bf\u30d3\u30e5\u30fc-8-300x169.png\" alt=\"\" class=\"c-postThumb__img u-obf-cover\" width=\"320\" height=\"180\"><\/figure><\/div>\t\t\t\t\t<div class=\"p-blogCard__body\">\n\t\t\t\t\t\t<a class=\"p-blogCard__title\" href=\"https:\/\/withcode.tech\/media\/interview_1\/\">\u3010\u526f\u696d\u306e\u65b9\u5fc5\u898b\u3011\u8d85\u30d6\u30e9\u30c3\u30af\u4f01\u696d\u304b\u3089\u72ec\u7acb\uff01Web\u5236\u4f5c\u306e\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u3067\u6d3b\u8e8d\u3067\u304d\u3066\u3044\u308b\u79d8\u8a23\u3068\u306f\uff1f<\/a>\n\t\t\t\t\t\t<span class=\"p-blogCard__excerpt\">\u30da\u30f3\u535a\u58eb\uff01\u30b9\u30af\u30fc\u30eb\u306e\u5352\u696d\u751f\u3067\u30d5\u30ea\u30fc\u30e9\u30f3\u30b9\u306b\u306a\u3063\u305f\u65b9\u304c\u3044\u308b\u3063\u3066\u805e\u3044\u305f\u3093\u3067\u3059\u3051\u3069\u307b\u3093\u3068\u3067\u3059\u304b\uff1f \u3046\u3080\u3001\u5143\u3005\u306f\u8d85\u30d6\u30e9\u30c3\u30af\u4f01\u696d\u3067\u50cd\u304d\u306a\u304c\u3089\u3001\u526f\u696d\u3067\u5b66\u7fd2\u3092\u7d9a\u3051\u3066\u304a\u3063\u305f\u53d7&#8230;<\/span>\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\n<p class=\"has-text-align-left 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target=\"_blank\" rel=\"noopener noreferrer\">\u8429\u539f\u5de5\u696d\u682a\u5f0f\u4f1a\u793e \u69d8<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n<div class=\"swell-block-postLink\">\t\t\t<div class=\"p-blogCard -external\" data-type=\"type3\" data-onclick=\"clickLink\">\n\t\t\t\t<div class=\"p-blogCard__inner\">\n\t\t\t\t\t<span class=\"p-blogCard__caption\">\u696d\u52d9\u52b9\u7387\u5316\u3092\u76ee\u7684\u306b\u3057\u305f\u30dd\u30fc\u30bf\u30eb\u30b5\u30a4\u30c8\u5236\u4f5c<\/span>\n\t\t\t\t\t<div class=\"p-blogCard__thumb c-postThumb\"><figure class=\"c-postThumb__figure\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-29-14.56.10.jpg\" alt=\"\" class=\"c-postThumb__img u-obf-cover\" width=\"320\" height=\"180\"><\/figure><\/div>\t\t\t\t\t<div class=\"p-blogCard__body\">\n\t\t\t\t\t\t<a class=\"p-blogCard__title\" href=\"https:\/\/withcode.tech\/works\/kke_smilesupport\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u682a\u5f0f\u4f1a\u793eKKE\u30b9\u30de\u30a4\u30eb\u30b5\u30dd\u30fc\u30c8 \u69d8<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n<div class=\"swell-block-postLink\">\t\t\t<div class=\"p-blogCard -external\" data-type=\"type3\" data-onclick=\"clickLink\">\n\t\t\t\t<div class=\"p-blogCard__inner\">\n\t\t\t\t\t<span class=\"p-blogCard__caption\">\u65b0\u30b5\u30fc\u30d3\u30b9\u306e\u96c6\u5ba2\u3092\u76ee\u7684\u306b\u3057\u305fLP\u5236\u4f5c<\/span>\n\t\t\t\t\t<div class=\"p-blogCard__thumb c-postThumb\"><figure class=\"c-postThumb__figure\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-29-14.58.59.jpg\" alt=\"\" class=\"c-postThumb__img u-obf-cover\" width=\"320\" height=\"180\"><\/figure><\/div>\t\t\t\t\t<div class=\"p-blogCard__body\">\n\t\t\t\t\t\t<a class=\"p-blogCard__title\" href=\"https:\/\/withcode.tech\/works\/lifeones-solutions\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u30e9\u30a4\u30d5\u30ef\u30f3\u30ba\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u30ba\u682a\u5f0f\u4f1a\u793e \u69d8<\/a>\n\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">WebP\/AVIF\u3068\u306f\uff1f\u6b21\u4e16\u4ee3\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006671.jpg\" alt=\"\" class=\"wp-image-13267\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006671.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006671-768x512.jpg 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u307e\u305a\u306f\u3001WebP\u3068AVIF\u3068\u3044\u3046\u6b21\u4e16\u4ee3\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u3064\u3044\u3066\u7406\u89e3\u3057\u3088\u3046\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">WebP\uff08\u30a6\u30a7\u30c3\u30d4\u30fc\uff09\u3068\u306f<\/h3>\n\n\n\n<p>WebP\u306f\u3001Google\u304c2010\u5e74\u306b\u958b\u767a\u3057\u305f\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u3059\u3002\u5f93\u6765\u306eJPEG\u3084PNG\u3068\u6bd4\u8f03\u3057\u3066\u3001<strong><span class=\"swl-marker mark_yellow\">\u540c\u3058\u54c1\u8cea\u3067\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u309225-35%\u524a\u6e1b<\/span><\/strong>\u3067\u304d\u308b\u3068\u3044\u3046\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>WebP\u306f\u4ee5\u4e0b\u306e\u7279\u5fb4\u3092\u6301\u3063\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u975e\u53ef\u9006\u5727\u7e2e\u3068\u53ef\u9006\u5727\u7e2e\u306e\u4e21\u65b9\u306b\u5bfe\u5fdc<\/strong>\uff1aJPEG\u306e\u3088\u3046\u306a\u975e\u53ef\u9006\u5727\u7e2e\u3068\u3001PNG\u306e\u3088\u3046\u306a\u53ef\u9006\u5727\u7e2e\u306e\u4e21\u65b9\u3092\u30b5\u30dd\u30fc\u30c8<\/li>\n\n\n\n<li><strong>\u900f\u904e\uff08\u30a2\u30eb\u30d5\u30a1\u30c1\u30e3\u30f3\u30cd\u30eb\uff09\u306b\u5bfe\u5fdc<\/strong>\uff1aPNG\u306e\u3088\u3046\u306b\u80cc\u666f\u900f\u904e\u304c\u53ef\u80fd<\/li>\n\n\n\n<li><strong>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306b\u5bfe\u5fdc<\/strong>\uff1aGIF\u306e\u3088\u3046\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u753b\u50cf\u3082\u4f5c\u6210\u53ef\u80fd<\/li>\n\n\n\n<li><strong>\u5e83\u3044\u30d6\u30e9\u30a6\u30b6\u5bfe\u5fdc<\/strong>\uff1a\u4e3b\u8981\u30d6\u30e9\u30a6\u30b6\u306e\u307b\u3068\u3093\u3069\u3067\u5bfe\u5fdc\u6e08\u307f\uff082020\u5e74\u4ee5\u964d\uff09<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">AVIF\uff08\u30a8\u30fc\u30d6\u30a4\u30a2\u30a4\u30a8\u30d5\uff09\u3068\u306f<\/h3>\n\n\n\n<p>AVIF\u306f\u3001Alliance for Open Media\u304c\u958b\u767a\u3057\u305f\u6bd4\u8f03\u7684\u65b0\u3057\u3044\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u3059\uff082019\u5e74\u30ea\u30ea\u30fc\u30b9\uff09\u3002WebP\u3088\u308a\u3082\u3055\u3089\u306b\u9ad8\u3044\u5727\u7e2e\u7387\u3092\u5b9f\u73fe\u3057\u3001<strong><span class=\"swl-marker mark_yellow\">WebP\u3068\u6bd4\u8f03\u3057\u3066\u3082\u7d0420-30%\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u524a\u6e1b<\/span><\/strong>\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<p>AVIF\u306e\u7279\u5fb4\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u512a\u308c\u305f\u5727\u7e2e\u7387<\/strong>\uff1a\u73fe\u5728\u6700\u3082\u52b9\u7387\u7684\u306a\u753b\u50cf\u5727\u7e2e\u3092\u5b9f\u73fe<\/li>\n\n\n\n<li><strong>\u9ad8\u753b\u8cea<\/strong>\uff1a\u5c0f\u3055\u3044\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3067\u3082\u9ad8\u3044\u753b\u8cea\u3092\u7dad\u6301<\/li>\n\n\n\n<li><strong>HDR\u5bfe\u5fdc<\/strong>\uff1a\u30cf\u30a4\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u30ec\u30f3\u30b8\uff08HDR\uff09\u306b\u3082\u5bfe\u5fdc<\/li>\n\n\n\n<li><strong>\u900f\u904e\u30fb\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u5bfe\u5fdc<\/strong>\uff1aWebP\u3068\u540c\u69d8\u306e\u6a5f\u80fd\u3092\u30b5\u30dd\u30fc\u30c8<\/li>\n\n\n\n<li><strong>\u30d6\u30e9\u30a6\u30b6\u5bfe\u5fdc\u304c\u9650\u5b9a\u7684<\/strong>\uff1a\u6bd4\u8f03\u7684\u65b0\u3057\u3044\u305f\u3081\u3001\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u306f\u9650\u3089\u308c\u308b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u5f93\u6765\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3068\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u6bd4\u8f03<\/h3>\n\n\n\n<p>\u540c\u3058\u753b\u8cea\u306e\u753b\u50cf\u3092\u7570\u306a\u308b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u4fdd\u5b58\u3057\u305f\u5834\u5408\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/th><th>\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba<\/th><th>\u524a\u6e1b\u7387<\/th><th>\u753b\u8cea<\/th><\/tr><\/thead><tbody><tr><td>JPEG\uff08\u30d9\u30fc\u30b9\u30e9\u30a4\u30f3\uff09<\/td><td>100KB<\/td><td>&#8211;<\/td><td>\u9ad8<\/td><\/tr><tr><td>PNG<\/td><td>150KB<\/td><td>+50%<\/td><td>\u6700\u9ad8\uff08\u53ef\u9006\uff09<\/td><\/tr><tr><td>WebP<\/td><td>70KB<\/td><td>-30%<\/td><td>\u9ad8<\/td><\/tr><tr><td>AVIF<\/td><td>50KB<\/td><td>-50%<\/td><td>\u9ad8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u3053\u306e\u8868\u304b\u3089\u308f\u304b\u308b\u3088\u3046\u306b\u3001<strong><span class=\"swl-marker mark_yellow\">AVIF\u3092\u4f7f\u7528\u3059\u308c\u3070\u3001\u5f93\u6765\u306eJPEG\u3068\u6bd4\u8f03\u3057\u3066\u7d04\u534a\u5206\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3067\u540c\u7b49\u306e\u753b\u8cea\u3092\u5b9f\u73fe<\/span><\/strong>\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">WebP\/AVIF\u3092\u4f7f\u7528\u3059\u308b\u30e1\u30ea\u30c3\u30c8<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006672.jpg\" alt=\"\" class=\"wp-image-13268\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006672.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006672-768x512.jpg 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.00.55.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>WebP\/AVIF\u3092\u4f7f\u7528\u3059\u308b\u30e1\u30ea\u30c3\u30c8\u3063\u3066\u4f55\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.12.07.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u826f\u3044\u8cea\u554f\u3058\u3083\uff01\u3053\u3053\u3067\u306f\u3001WebP\/AVIF\u3092\u4f7f\u7528\u3059\u308b\u30e1\u30ea\u30c3\u30c8\u306b\u3064\u3044\u3066\u89e3\u8aac\u3059\u308b\u305e\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">1. \u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u306e\u5927\u5e45\u306a\u6539\u5584<\/h3>\n\n\n\n<p>\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u304c\u5c0f\u3055\u304f\u306a\u308b\u3053\u3068\u3067\u3001\u30da\u30fc\u30b8\u5168\u4f53\u306e\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c\u77ed\u7e2e\u3055\u308c\u307e\u3059\u3002\u7279\u306b\u30e2\u30d0\u30a4\u30eb\u74b0\u5883\u3084\u901a\u4fe1\u901f\u5ea6\u304c\u9045\u3044\u74b0\u5883\u3067\u306f\u3001\u305d\u306e\u52b9\u679c\u304c\u9855\u8457\u306b\u73fe\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5b9f\u969b\u306e\u52b9\u679c\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u753b\u50cf\u7dcf\u5bb9\u91cf\u304c10MB\u306e\u30da\u30fc\u30b8\u306e\u5834\u5408\u3001WebP\u306b\u5909\u63db\u3059\u308b\u3068\u7d047MB\u306b\u524a\u6e1b<\/li>\n\n\n\n<li>AVIF\u3092\u4f7f\u7528\u3059\u308c\u3070\u3055\u3089\u306b\u7d045MB\u307e\u3067\u524a\u6e1b\u53ef\u80fd<\/li>\n\n\n\n<li>4G\u56de\u7dda\uff0810Mbps\uff09\u306e\u5834\u5408\u3001\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c8\u79d2\u304b\u30894\u79d2\u306b\u77ed\u7e2e<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. Core Web Vitals\u306e\u6539\u5584<\/h3>\n\n\n\n<p>Google\u304c\u91cd\u8996\u3059\u308bCore Web Vitals\uff08\u30b3\u30a2\u30a6\u30a7\u30d6\u30d0\u30a4\u30bf\u30eb\uff09\u306e\u6307\u6a19\u3001\u7279\u306b<strong><span class=\"swl-marker mark_yellow\">LCP\uff08Largest Contentful Paint\uff09\u306e\u6539\u5584<\/span><\/strong>\u306b\u76f4\u63a5\u8ca2\u732e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>LCP\u3068\u306f\u3001\u30da\u30fc\u30b8\u306e\u4e3b\u8981\u30b3\u30f3\u30c6\u30f3\u30c4\uff08\u591a\u304f\u306e\u5834\u5408\u3001\u5927\u304d\u306a\u753b\u50cf\uff09\u304c\u8868\u793a\u3055\u308c\u308b\u307e\u3067\u306e\u6642\u9593\u3092\u6e2c\u5b9a\u3059\u308b\u6307\u6a19\u3067\u3059\u3002\u6b21\u4e16\u4ee3\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c\u77ed\u7e2e\u3055\u308c\u308b<\/li>\n\n\n\n<li>LCP\u30b9\u30b3\u30a2\u304c\u6539\u5584\u3055\u308c\u308b<\/li>\n\n\n\n<li>SEO\u8a55\u4fa1\u304c\u5411\u4e0a\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u5e2f\u57df\u5e45\u3068\u30b5\u30fc\u30d0\u30fc\u30b3\u30b9\u30c8\u306e\u524a\u6e1b<\/h3>\n\n\n\n<p>\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u304c\u5c0f\u3055\u304f\u306a\u308b\u3053\u3068\u3067\u3001\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306e\u8ee2\u9001\u30c7\u30fc\u30bf\u91cf\u304c\u524a\u6e1b\u3055\u308c\u3001\u4ee5\u4e0b\u306e\u30e1\u30ea\u30c3\u30c8\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u30b5\u30fc\u30d0\u30fc\u8ca0\u8377\u306e\u8efd\u6e1b<\/strong>\uff1a\u8ee2\u9001\u30c7\u30fc\u30bf\u91cf\u304c\u6e1b\u308b\u3053\u3068\u3067\u30b5\u30fc\u30d0\u30fc\u3078\u306e\u8ca0\u62c5\u304c\u8efd\u6e1b<\/li>\n\n\n\n<li><strong>CDN\u8cbb\u7528\u306e\u524a\u6e1b<\/strong>\uff1a\u8ee2\u9001\u30c7\u30fc\u30bf\u91cf\u306b\u5fdc\u3058\u305f\u8ab2\u91d1\u306e\u5834\u5408\u3001\u30b3\u30b9\u30c8\u524a\u6e1b\u306b\u3064\u306a\u304c\u308b<\/li>\n\n\n\n<li><strong>\u30e6\u30fc\u30b6\u30fc\u306e\u30c7\u30fc\u30bf\u901a\u4fe1\u91cf\u524a\u6e1b<\/strong>\uff1a\u30e2\u30d0\u30a4\u30eb\u30e6\u30fc\u30b6\u30fc\u306e\u30c7\u30fc\u30bf\u4f7f\u7528\u91cf\u3092\u6291\u3048\u308b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. \u30e6\u30fc\u30b6\u30fc\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u306e\u5411\u4e0a<\/h3>\n\n\n\n<p>\u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u304c\u901f\u3044\u30b5\u30a4\u30c8\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u6e80\u8db3\u5ea6\u304c\u9ad8\u304f\u306a\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u76f4\u5e30\u7387\u306e\u4f4e\u4e0b<\/strong>\uff1a\u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u304c\u9045\u3044\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u96e2\u8131\u3057\u3084\u3059\u3044<\/li>\n\n\n\n<li><strong>\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u7387\u306e\u5411\u4e0a<\/strong>\uff1a\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u304c1\u79d2\u6539\u5584\u3059\u308b\u3068\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u7387\u304c\u7d047%\u5411\u4e0a\u3059\u308b\u3068\u3044\u3046\u30c7\u30fc\u30bf\u3082<\/li>\n\n\n\n<li><strong>SEO\u30e9\u30f3\u30ad\u30f3\u30b0\u306e\u5411\u4e0a<\/strong>\uff1aGoogle\u306f\u30da\u30fc\u30b8\u901f\u5ea6\u3092\u691c\u7d22\u30e9\u30f3\u30ad\u30f3\u30b0\u306e\u8981\u56e0\u3068\u3057\u3066\u3044\u308b<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d6\u30e9\u30a6\u30b6\u5bfe\u5fdc\u72b6\u6cc1\u3068\u8ab2\u984c<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006673.jpg\" alt=\"\" class=\"wp-image-13270\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006673.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006673-768x512.jpg 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.13.05.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u6b21\u4e16\u4ee3\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u6700\u5927\u306e\u8ab2\u984c\u306f\u3001\u3059\u3079\u3066\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u3068\u3044\u3046\u70b9\u3058\u3083\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">WebP\u306e\u30d6\u30e9\u30a6\u30b6\u5bfe\u5fdc\u72b6\u6cc1<\/h3>\n\n\n\n<p>WebP\u306f\u6bd4\u8f03\u7684\u5e83\u304f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\uff082026\u5e742\u6708\u6642\u70b9\uff09\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Chrome<\/strong>\uff1a\u30d0\u30fc\u30b8\u30e7\u30f332\u4ee5\u964d\uff082014\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Firefox<\/strong>\uff1a\u30d0\u30fc\u30b8\u30e7\u30f365\u4ee5\u964d\uff082019\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Edge<\/strong>\uff1a\u30d0\u30fc\u30b8\u30e7\u30f318\u4ee5\u964d\uff082018\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Safari<\/strong>\uff1a\u30d0\u30fc\u30b8\u30e7\u30f314\u4ee5\u964d\uff082020\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Opera<\/strong>\uff1a\u30d0\u30fc\u30b8\u30e7\u30f319\u4ee5\u964d\uff082014\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Safari iOS<\/strong>\uff1aiOS 14\u4ee5\u964d\uff082020\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Internet Explorer<\/strong>\uff1a\u975e\u5bfe\u5fdc <\/li>\n<\/ul>\n\n\n\n<p>\u4e16\u754c\u306e\u30d6\u30e9\u30a6\u30b6\u30b7\u30a7\u30a2\u3067\u898b\u308b\u3068\u3001<strong><span class=\"swl-marker mark_yellow\">\u7d0498.4%\u306e\u30e6\u30fc\u30b6\u30fc\u304cWebP\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u30d6\u30e9\u30a6\u30b6<\/span><\/strong>\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">AVIF\u306e\u30d6\u30e9\u30a6\u30b6\u5bfe\u5fdc\u72b6\u6cc1<\/h3>\n\n\n\n<p>AVIF\u306f\u6bd4\u8f03\u7684\u65b0\u3057\u3044\u305f\u3081\u3001\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u306f\u9650\u3089\u308c\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Chrome<\/strong>\uff1a\u30d0\u30fc\u30b8\u30e7\u30f385\u4ee5\u964d\uff082020\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Firefox<\/strong>\uff1a\u30d0\u30fc\u30b8\u30e7\u30f393\u4ee5\u964d\uff082021\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Edge<\/strong>\uff1a\u30d0\u30fc\u30b8\u30e7\u30f3121\u4ee5\u964d\uff082024\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Safari<\/strong>\uff1a\u30d0\u30fc\u30b8\u30e7\u30f316.1\u4ee5\u964d\uff082022\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Opera<\/strong>\uff1a\u30d0\u30fc\u30b8\u30e7\u30f371\u4ee5\u964d\uff082020\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Safari iOS<\/strong>\uff1aiOS 16\u4ee5\u964d\uff082022\u5e74\u301c\uff09<\/li>\n\n\n\n<li><strong>Internet Explorer<\/strong>\uff1a\u975e\u5bfe\u5fdc <\/li>\n<\/ul>\n\n\n\n<p>\u4e16\u754c\u306e\u30d6\u30e9\u30a6\u30b6\u30b7\u30a7\u30a2\u3067\u898b\u308b\u3068\u3001<strong><span class=\"swl-marker mark_yellow\">\u7d0480-85%\u306e\u30e6\u30fc\u30b6\u30fc\u304cAVIF\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u30d6\u30e9\u30a6\u30b6<\/span><\/strong>\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u306a\u305c\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u5fc5\u8981\u306a\u306e\u304b\uff1f<\/h3>\n\n\n\n<p>\u4e0a\u8a18\u306e\u5bfe\u5fdc\u72b6\u6cc1\u304b\u3089\u3001\u4ee5\u4e0b\u306e\u8ab2\u984c\u304c\u898b\u3048\u3066\u304d\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u914d\u616e<\/strong>\uff1aInternet Explorer\u3084Safari 13\u4ee5\u524d\u306e\u30e6\u30fc\u30b6\u30fc\u306f\u3001WebP\u3092\u8868\u793a\u3067\u304d\u307e\u305b\u3093<\/li>\n\n\n\n<li><strong>AVIF\u306e\u5bfe\u5fdc\u7387<\/strong>\uff1a\u7d0415-20%\u306e\u30e6\u30fc\u30b6\u30fc\u306fAVIF\u3092\u8868\u793a\u3067\u304d\u307e\u305b\u3093<\/li>\n\n\n\n<li><strong>\u4f01\u696d\u5411\u3051\u30b5\u30a4\u30c8\u306e\u8003\u616e<\/strong>\uff1a\u4f01\u696d\u306b\u3088\u3063\u3066\u306f\u53e4\u3044\u30d6\u30e9\u30a6\u30b6\u306e\u4f7f\u7528\u3092\u5f37\u5236\u3055\u308c\u3066\u3044\u308b\u30b1\u30fc\u30b9\u3082\u3042\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u305d\u306e\u305f\u3081\u3001<strong><span class=\"swl-marker mark_yellow\">\u3059\u3079\u3066\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u6700\u9069\u306a\u4f53\u9a13\u3092\u63d0\u4f9b\u3059\u308b\u305f\u3081\u306b\u3001\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u5b9f\u88c5\u304c\u5fc5\u9808<\/span><\/strong>\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.06.05.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u306a\u308b\u307b\u3069\uff01\u3059\u3079\u3066\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u308f\u3051\u3058\u3083\u306a\u3044\u304b\u3089\u3001\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u30d6\u30e9\u30a6\u30b6\u7528\u306b\u4ee3\u308f\u308a\u306e\u753b\u50cf\u3092\u7528\u610f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3093\u3067\u3059\u306d\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u305d\u306e\u901a\u308a\u3058\u3083\uff01\u305d\u308c\u304c\u300c\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u300d\u3068\u3044\u3046\u8003\u3048\u65b9\u306a\u3093\u3058\u3083\u3088\u3002\u6b21\u306f\u3001\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304f\u305e\u3044\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">picture\u8981\u7d20\u3092\u4f7f\u3063\u305f\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u5b9f\u88c5\u3010\u57fa\u672c\u7de8\u3011<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006674.jpg\" alt=\"\" class=\"wp-image-13271\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006674.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006674-768x512.jpg 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u5b9f\u88c5\u65b9\u6cd5\u3092\u6559\u3048\u3066\u304f\u3060\u3055\u3044\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.12.07.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u3046\u3080\u3002\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u5b9f\u88c5\u306e\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u3067\u52b9\u679c\u7684\u306a\u65b9\u6cd5\u306f\u3001HTML5\u306e<strong>picture\u8981\u7d20<\/strong>\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3058\u3083\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">picture\u8981\u7d20\u3068\u306f\uff1f<\/h3>\n\n\n\n<p>picture\u8981\u7d20\u306f\u3001\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u753b\u50cf\u3092\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306eHTML5\u306e\u8981\u7d20\u3067\u3059\u3002\u8907\u6570\u306e\u753b\u50cf\u30bd\u30fc\u30b9\u3092\u6307\u5b9a\u3057\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u81ea\u52d5\u7684\u306b\u6700\u9069\u306a\u753b\u50cf\u3092\u9078\u629e\u3057\u3066\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>picture\u8981\u7d20\u306e\u69cb\u6210\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>&lt;picture&gt;<\/strong>\uff1a\u30b3\u30f3\u30c6\u30ca\u8981\u7d20<\/li>\n\n\n\n<li><strong>&lt;source&gt;<\/strong>\uff1a\u8907\u6570\u306e\u753b\u50cf\u30bd\u30fc\u30b9\u3092\u6307\u5b9a\uff08type\u5c5e\u6027\u3067MIME\u30bf\u30a4\u30d7\u3092\u6307\u5b9a\uff09<\/li>\n\n\n\n<li><strong>&lt;img&gt;<\/strong>\uff1a\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u7528\u306e\u753b\u50cf\uff08\u5fc5\u9808\uff09<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u5b9f\u88c5\u4f8b<\/h3>\n\n\n\n<p>WebP\u3068JPEG\u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u5b9f\u88c5\u3059\u308b\u57fa\u672c\u7684\u306a\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;picture&gt;\n  &lt;!-- WebP\u5f62\u5f0f\u306e\u753b\u50cf --&gt;\n  &lt;source srcset=&quot;image.webp&quot; type=&quot;image\/webp&quot;&gt;\n  &lt;!-- \u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u7528JPEG\u753b\u50cf --&gt;\n  &lt;img src=&quot;image.jpg&quot; alt=&quot;\u753b\u50cf\u306e\u8aac\u660e&quot; loading=&quot;lazy&quot;&gt;\n&lt;\/picture&gt;<\/code><\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u30b3\u30fc\u30c9\u89e3\u8aac<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>&lt;picture&gt;\u8981\u7d20<\/strong>\uff1a\u8907\u6570\u306e\u753b\u50cf\u30bd\u30fc\u30b9\u3092\u30b0\u30eb\u30fc\u30d7\u5316\u3057\u307e\u3059<\/li>\n\n\n\n<li><strong>&lt;source srcset=&#8221;image.webp&#8221; type=&#8221;image\/webp&#8221;&gt;<\/strong>\uff1a\n<ul>\n<li><code>srcset<\/code>\u5c5e\u6027\u3067WebP\u5f62\u5f0f\u306e\u753b\u50cf\u30d1\u30b9\u3092\u6307\u5b9a<\/li>\n<li><code>type=\"image\/webp\"<\/code>\u3067MIME\u30bf\u30a4\u30d7\u3092\u660e\u793a<\/li>\n<li>\u30d6\u30e9\u30a6\u30b6\u304cWebP\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u3053\u306e\u753b\u50cf\u304c\u4f7f\u7528\u3055\u308c\u308b<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>&lt;img src=&#8221;image.jpg&#8221;&gt;<\/strong>\uff1a\n<ul>\n<li>WebP\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u30d6\u30e9\u30a6\u30b6\u3067\u8868\u793a\u3055\u308c\u308b\u753b\u50cf<\/li>\n<li><code>alt<\/code>\u5c5e\u6027\u3067\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u3092\u78ba\u4fdd<\/li>\n<li><code>loading=\"lazy\"<\/code>\u3067\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u6709\u52b9\u5316\uff08\u30aa\u30d7\u30b7\u30e7\u30f3\uff09<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">AVIF + WebP + JPEG\u306e\u591a\u6bb5\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af<\/h3>\n\n\n\n<p>\u3055\u3089\u306b\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306b\u3001AVIF\u3001WebP\u3001JPEG\u306e3\u6bb5\u968e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u5b9f\u88c5\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;picture&gt;\n  &lt;!-- AVIF\u5f62\u5f0f\u306e\u753b\u50cf\uff08\u6700\u512a\u5148\uff09 --&gt;\n  &lt;source srcset=&quot;image.avif&quot; type=&quot;image\/avif&quot;&gt;\n  &lt;!-- WebP\u5f62\u5f0f\u306e\u753b\u50cf\uff08\u7b2c2\u5019\u88dc\uff09 --&gt;\n  &lt;source srcset=&quot;image.webp&quot; type=&quot;image\/webp&quot;&gt;\n  &lt;!-- JPEG\u5f62\u5f0f\u306e\u753b\u50cf\uff08\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\uff09 --&gt;\n  &lt;img src=&quot;image.jpg&quot; alt=&quot;\u753b\u50cf\u306e\u8aac\u660e&quot; loading=&quot;lazy&quot; width=&quot;800&quot; height=&quot;600&quot;&gt;\n&lt;\/picture&gt;<\/code><\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8<\/h4>\n\n\n\n<p class=\"is-style-big_icon_point\"><strong>source\u8981\u7d20\u306e\u9806\u5e8f\u304c\u91cd\u8981\uff1a<\/strong><br>1. \u6700\u3082\u52b9\u7387\u7684\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff08AVIF\uff09\u3092\u6700\u521d\u306b\u8a18\u8ff0<br>2. \u6b21\u306b\u52b9\u7387\u7684\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff08WebP\uff09\u3092\u8a18\u8ff0<br>3. \u6700\u5f8c\u306b\u4e92\u63db\u6027\u306e\u9ad8\u3044\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\uff08JPEG\/PNG\uff09\u3092\u8a18\u8ff0<\/p>\n\n\n\n<p>\u30d6\u30e9\u30a6\u30b6\u306f\u4e0a\u304b\u3089\u9806\u306b\u78ba\u8a8d\u3057\u3001<strong><span class=\"swl-marker mark_yellow\">\u6700\u521d\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u5f62\u5f0f\u306e\u753b\u50cf\u3092\u8868\u793a<\/span><\/strong>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u52d5\u4f5c\u306e\u4ed5\u7d44\u307f<\/h3>\n\n\n\n<p>\u30d6\u30e9\u30a6\u30b6\u306f\u4ee5\u4e0b\u306e\u30ed\u30b8\u30c3\u30af\u3067\u753b\u50cf\u3092\u9078\u629e\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Chrome 85+\u306e\u5834\u5408<\/strong>\uff1a\n<ul>\n<li>AVIF\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u305f\u3081\u3001<code>image.avif<\/code>\u3092\u8aad\u307f\u8fbc\u3080<\/li>\n<li>\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\uff1a\u7d0450KB<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Safari 14-16\u306e\u5834\u5408<\/strong>\uff1a\n<ul>\n<li>AVIF\u306b\u975e\u5bfe\u5fdc\u3001WebP\u306b\u5bfe\u5fdc<\/li>\n<li><code>image.webp<\/code>\u3092\u8aad\u307f\u8fbc\u3080<\/li>\n<li>\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\uff1a\u7d0470KB<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Internet Explorer 11\u306e\u5834\u5408<\/strong>\uff1a\n<ul>\n<li>AVIF\u3001WebP\u4e21\u65b9\u306b\u975e\u5bfe\u5fdc<\/li>\n<li><code>image.jpg<\/code>\u3092\u8aad\u307f\u8fbc\u3080<\/li>\n<li>\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\uff1a\u7d04100KB<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001<strong><span class=\"swl-marker mark_yellow\">\u5404\u30d6\u30e9\u30a6\u30b6\u3067\u6700\u9069\u306a\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u304c\u81ea\u52d5\u7684\u306b\u9078\u629e\u3055\u308c\u3001\u3059\u3079\u3066\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u753b\u50cf\u304c\u8868\u793a\u3055\u308c\u308b<\/span><\/strong>\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u753b\u50cf\u3068\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u7d44\u307f\u5408\u308f\u305b\u3010\u5fdc\u7528\u7de8\u3011<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006675-1.jpg\" alt=\"\" class=\"wp-image-13273\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006675-1.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006675-1-768x512.jpg 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>picture\u8981\u7d20\u306e\u5fdc\u7528\u65b9\u6cd5\u3082\u6559\u3048\u3066\u304f\u3060\u3055\u3044\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.08.37.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u826f\u3044\u5fc3\u304c\u3051\u3058\u3083\uff01picture\u8981\u7d20\u306f\u3001\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3060\u3051\u3067\u306a\u304f\u3001\u753b\u9762\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u305f\u753b\u50cf\u306e\u51fa\u3057\u5206\u3051\u306b\u3082\u4f7f\u7528\u3067\u304d\u308b\u305e\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u753b\u9762\u30b5\u30a4\u30ba\u3068\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u4e21\u65b9\u306b\u5bfe\u5fdc\u3059\u308b\u5b9f\u88c5<\/h3>\n\n\n\n<p>\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u3068\u30e2\u30d0\u30a4\u30eb\u3067\u7570\u306a\u308b\u753b\u50cf\u3092\u8868\u793a\u3057\u3064\u3064\u3001\u5404\u30c7\u30d0\u30a4\u30b9\u3067\u6700\u9069\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u63d0\u4f9b\u3059\u308b\u5b9f\u88c5\u4f8b\u3067\u3059\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;picture&gt;\n  &lt;!-- \u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u5411\u3051\uff081024px\u4ee5\u4e0a\uff09 --&gt;\n  &lt;source\n    media=&quot;(min-width: 1024px)&quot;\n    srcset=&quot;hero-desktop.avif&quot;\n    type=&quot;image\/avif&quot;&gt;\n  &lt;source\n    media=&quot;(min-width: 1024px)&quot;\n    srcset=&quot;hero-desktop.webp&quot;\n    type=&quot;image\/webp&quot;&gt;\n  &lt;source\n    media=&quot;(min-width: 1024px)&quot;\n    srcset=&quot;hero-desktop.jpg&quot;\n    type=&quot;image\/jpeg&quot;&gt;\n  &lt;!-- \u30bf\u30d6\u30ec\u30c3\u30c8\u5411\u3051\uff08768px\u4ee5\u4e0a\uff09 --&gt;\n  &lt;source\n    media=&quot;(min-width: 768px)&quot;\n    srcset=&quot;hero-tablet.avif&quot;\n    type=&quot;image\/avif&quot;&gt;\n  &lt;source\n    media=&quot;(min-width: 768px)&quot;\n    srcset=&quot;hero-tablet.webp&quot;\n    type=&quot;image\/webp&quot;&gt;\n  &lt;source\n    media=&quot;(min-width: 768px)&quot;\n    srcset=&quot;hero-tablet.jpg&quot;\n    type=&quot;image\/jpeg&quot;&gt;\n  &lt;!-- \u30e2\u30d0\u30a4\u30eb\u5411\u3051\uff08\u30c7\u30d5\u30a9\u30eb\u30c8\uff09 --&gt;\n  &lt;source srcset=&quot;hero-mobile.avif&quot; type=&quot;image\/avif&quot;&gt;\n  &lt;source srcset=&quot;hero-mobile.webp&quot; type=&quot;image\/webp&quot;&gt;\n  &lt;!-- \u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af --&gt;\n  &lt;img src=&quot;hero-mobile.jpg&quot; alt=&quot;\u30d2\u30fc\u30ed\u30fc\u753b\u50cf&quot; loading=&quot;lazy&quot; width=&quot;1920&quot; height=&quot;1080&quot;&gt;\n&lt;\/picture&gt;<\/code><\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u30b3\u30fc\u30c9\u89e3\u8aac<\/h4>\n\n\n\n<p class=\"is-style-big_icon_check\"><strong>\u30fbmedia\u5c5e\u6027<\/strong>\uff1a\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u6307\u5b9a\u3057\u3001\u753b\u9762\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u3066\u753b\u50cf\u3092\u5207\u308a\u66ff\u3048<br><strong>\u30fb<strong>\u5404\u753b\u9762\u30b5\u30a4\u30ba\u30673\u3064\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u7528\u610f<\/strong>\uff1a<\/strong>AVIF \u2192 WebP \u2192 JPEG \u306e\u512a\u5148\u9806\u4f4d<strong><br>\u30fb\u30d6\u30e9\u30a6\u30b6\u306e\u9078\u629e\u30ed\u30b8\u30c3\u30af<\/strong>\uff1a<br>1. <span style=\"font-size: revert;\">\u307e\u305a\u753b\u9762\u30b5\u30a4\u30ba\u306b\u5408\u81f4\u3059\u308b<\/span><code style=\"letter-spacing: normal;\">media<\/code><span style=\"font-size: revert;\">\u5c5e\u6027\u3092\u6301\u3064source\u8981\u7d20\u3092\u63a2\u3059<\/span><br>2. <span style=\"font-size: revert;\">\u8a72\u5f53\u3059\u308bsource\u8981\u7d20\u306e\u4e2d\u304b\u3089\u3001\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u9078\u629e<\/span><br>3.<span style=\"font-size: revert;\"> \u3069\u308c\u3082\u8a72\u5f53\u3057\u306a\u3044\u5834\u5408\u306fimg\u8981\u7d20\u306esrc\u3092\u4f7f\u7528<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u9ad8\u89e3\u50cf\u5ea6\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\uff08Retina\uff09\u5bfe\u5fdc<\/h3>\n\n\n\n<p>Retina\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\u306a\u3069\u306e\u9ad8\u89e3\u50cf\u5ea6\u753b\u9762\u306b\u3082\u5bfe\u5fdc\u3059\u308b\u5b9f\u88c5\u4f8b\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;picture&gt;\n  &lt;!-- 2x\u89e3\u50cf\u5ea6\uff08Retina\uff09\u5411\u3051AVIF --&gt;\n  &lt;source\n    srcset=&quot;image-1x.avif 1x, image-2x.avif 2x&quot;\n    type=&quot;image\/avif&quot;&gt;\n  &lt;!-- 2x\u89e3\u50cf\u5ea6\uff08Retina\uff09\u5411\u3051WebP --&gt;\n  &lt;source\n    srcset=&quot;image-1x.webp 1x, image-2x.webp 2x&quot;\n    type=&quot;image\/webp&quot;&gt;\n  &lt;!-- \u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\uff08\u89e3\u50cf\u5ea6\u5bfe\u5fdc\uff09 --&gt;\n  &lt;img\n    src=&quot;image-1x.jpg&quot;\n    srcset=&quot;image-1x.jpg 1x, image-2x.jpg 2x&quot;\n    alt=&quot;\u753b\u50cf\u306e\u8aac\u660e&quot;\n    loading=&quot;lazy&quot;&gt;\n&lt;\/picture&gt;<\/code><\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u89e3\u50cf\u5ea6\u5bfe\u5fdc\u306e\u30dd\u30a4\u30f3\u30c8<\/h4>\n\n\n\n<p class=\"is-style-big_icon_point\"><strong>\u30fb1x<\/strong>\uff1a\u901a\u5e38\u306e\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\u7528\uff08\u6a19\u6e96\u89e3\u50cf\u5ea6\uff09<br><strong>\u30fb<strong>2x<\/strong>\uff1a<\/strong>\u9ad8\u89e3\u50cf\u5ea6\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\u7528\uff08Retina\u30014K\u306a\u3069\uff09<strong><br>\u30fb<\/strong>\u30d6\u30e9\u30a6\u30b6\u306f\u81ea\u52d5\u7684\u306b\u30c7\u30d0\u30a4\u30b9\u306e\u89e3\u50cf\u5ea6\u306b\u5fdc\u3058\u305f\u753b\u50cf\u3092\u9078\u629e<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">.htaccess\u3092\u4f7f\u3063\u305f\u30b5\u30fc\u30d0\u30fc\u5074\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3010\u30b5\u30fc\u30d0\u30fc\u8a2d\u5b9a\u7de8\u3011<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006676.jpg\" alt=\"\" class=\"wp-image-13274\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006676.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006676-768x512.jpg 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u4ed6\u306b\u306f\u3069\u3093\u306a\u65b9\u6cd5\u304c\u3042\u308b\u306e\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.09.27.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>Apache\u30b5\u30fc\u30d0\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001.htaccess\u30d5\u30a1\u30a4\u30eb\u3067\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3058\u3083\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">.htaccess\u306b\u3088\u308b\u81ea\u52d5\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u4ed5\u7d44\u307f<\/h3>\n\n\n\n<p>\u3053\u306e\u65b9\u6cd5\u3067\u306f\u3001HTML\u3092\u5909\u66f4\u305b\u305a\u306b\u3001\u30b5\u30fc\u30d0\u30fc\u5074\u3067\u30d6\u30e9\u30a6\u30b6\u306e\u5bfe\u5fdc\u72b6\u6cc1\u3092\u5224\u5b9a\u3057\u3001\u81ea\u52d5\u7684\u306b\u6700\u9069\u306a\u753b\u50cf\u3092\u914d\u4fe1\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-plain\"><code>&lt;IfModule mod_rewrite.c&gt;\n  RewriteEngine On\n  # AVIF\u30b5\u30dd\u30fc\u30c8\u306e\u30c1\u30a7\u30c3\u30af\n  RewriteCond %{HTTP_ACCEPT} image\/avif\n  RewriteCond %{REQUEST_FILENAME} (.*)\\.(jpe?g|png)$\n  RewriteCond %1\\.avif -f\n  RewriteRule ^ %1\\.avif [L]\n  # WebP\u30b5\u30dd\u30fc\u30c8\u306e\u30c1\u30a7\u30c3\u30af\n  RewriteCond %{HTTP_ACCEPT} image\/webp\n  RewriteCond %{REQUEST_FILENAME} (.*)\\.(jpe?g|png)$\n  RewriteCond %1\\.webp -f\n  RewriteRule ^ %1\\.webp [L]\n&lt;\/IfModule&gt;\n&lt;IfModule mod_headers.c&gt;\n  &lt;FilesMatch &quot;\\.(jpe?g|png)$&quot;&gt;\n    Header append Vary Accept\n  &lt;\/FilesMatch&gt;\n&lt;\/IfModule&gt;<\/code><\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u30b3\u30fc\u30c9\u89e3\u8aac<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>mod_rewrite\u306e\u6709\u52b9\u5316<\/strong>\uff1a\n<ul>\n<li>URL\u30ea\u30e9\u30a4\u30c8\u6a5f\u80fd\u3092\u6709\u52b9\u306b\u3059\u308b<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>AVIF\u30b5\u30dd\u30fc\u30c8\u306e\u30c1\u30a7\u30c3\u30af<\/strong>\uff1a\n<ul>\n<li><code>%{HTTP_ACCEPT} image\/avif<\/code>\uff1a\u30d6\u30e9\u30a6\u30b6\u304cAVIF\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u304b\u78ba\u8a8d<\/li>\n<li><code>%1\\.avif -f<\/code>\uff1a\u5bfe\u5fdc\u3059\u308bAVIF\u30d5\u30a1\u30a4\u30eb\u304c\u5b58\u5728\u3059\u308b\u304b\u78ba\u8a8d<\/li>\n<li>\u6761\u4ef6\u304c\u6e80\u305f\u3055\u308c\u308c\u3070\u3001AVIF\u753b\u50cf\u3092\u914d\u4fe1<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>WebP\u30b5\u30dd\u30fc\u30c8\u306e\u30c1\u30a7\u30c3\u30af<\/strong>\uff1a\n<ul>\n<li>AVIF\u304c\u4f7f\u3048\u306a\u3044\u5834\u5408\u3001WebP\u3092\u30c1\u30a7\u30c3\u30af<\/li>\n<li>\u540c\u69d8\u306e\u6761\u4ef6\u3067\u5224\u5b9a\u3057\u3001WebP\u753b\u50cf\u3092\u914d\u4fe1<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Vary\u30d8\u30c3\u30c0\u30fc\u306e\u8ffd\u52a0<\/strong>\uff1a\n<ul>\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u6b63\u3057\u304f\u52d5\u4f5c\u3059\u308b\u3088\u3046\u3001Accept\u30d8\u30c3\u30c0\u30fc\u306b\u57fa\u3065\u3044\u3066\u5909\u5316\u3059\u308b\u3053\u3068\u3092\u660e\u793a<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">.htaccess\u65b9\u5f0f\u306e\u30e1\u30ea\u30c3\u30c8\u3068\u30c7\u30e1\u30ea\u30c3\u30c8<\/h3>\n\n\n\n<p><strong>\u30e1\u30ea\u30c3\u30c8\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HTML\u3092\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u306a\u3044<\/li>\n\n\n\n<li>\u65e2\u5b58\u306eimg\u8981\u7d20\u304c\u305d\u306e\u307e\u307e\u4f7f\u3048\u308b<\/li>\n\n\n\n<li>\u4e00\u5ea6\u8a2d\u5b9a\u3059\u308c\u3070\u3001\u3059\u3079\u3066\u306e\u753b\u50cf\u306b\u9069\u7528\u3055\u308c\u308b<\/li>\n<\/ul>\n\n\n\n<p><strong>\u30c7\u30e1\u30ea\u30c3\u30c8\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Apache\u30b5\u30fc\u30d0\u30fc\u306e\u307f\u5bfe\u5fdc\uff08Nginx\u3067\u306f\u5225\u306e\u8a2d\u5b9a\u304c\u5fc5\u8981\uff09<\/li>\n\n\n\n<li>mod_rewrite\u30e2\u30b8\u30e5\u30fc\u30eb\u304c\u6709\u52b9\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308b<\/li>\n\n\n\n<li>\u30b5\u30fc\u30d0\u30fc\u306e\u8a2d\u5b9a\u5909\u66f4\u6a29\u9650\u304c\u5fc5\u8981<\/li>\n\n\n\n<li>CDN\u4f7f\u7528\u6642\u306f\u52d5\u4f5c\u3057\u306a\u3044\u5834\u5408\u304c\u3042\u308b<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">JavaScript\u3092\u4f7f\u3063\u305f\u52d5\u7684\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3010JavaScript\u7de8\u3011<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006677.jpg\" alt=\"\" class=\"wp-image-13275\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006677.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006677-768x512.jpg 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.12.07.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u4ed6\u306b\u3082JavaScript\u3092\u4f7f\u7528\u3057\u3066\u3001\u30d6\u30e9\u30a6\u30b6\u306e\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u5bfe\u5fdc\u72b6\u6cc1\u3092\u691c\u51fa\u3057\u3001\u52d5\u7684\u306b\u753b\u50cf\u3092\u5207\u308a\u66ff\u3048\u308b\u65b9\u6cd5\u3082\u3042\u308b\u306e\u3058\u3083\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u305d\u3046\u306a\u3093\u3067\u3059\u306d\uff01\u6559\u3048\u3066\u304f\u3060\u3055\u3044\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u5bfe\u5fdc\u691c\u51fa\u30b3\u30fc\u30c9<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ \u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u5bfe\u5fdc\u3092\u691c\u51fa\u3059\u308b\u95a2\u6570\nasync function checkImageFormatSupport() {\n  const formats = {\n    avif: &#39;data:image\/avif;base64,AAAAIGZ0eXBhdmlmAAAAAGF2aWZtaWYxbWlhZk1BMUIAAADybWV0YQAAAAAAAAAoaGRscgAAAAAAAAAAcGljdAAAAAAAAAAAAAAAAGxpYmF2aWYAAAAADnBpdG0AAAAAAAEAAAAeaWxvYwAAAABEAAABAAEAAAABAAABGgAAAB0AAAAoaWluZgAAAAAAAQAAABppbmZlAgAAAAABAABhdjAxQ29sb3IAAAAAamlwcnAAAABLaXBjbwAAABRpc3BlAAAAAAAAAAIAAAACAAAAEHBpeGkAAAAAAwgICAAAAAxhdjFDgQ0MAAAAABNjb2xybmNseAACAAIAAYAAAAAXaXBtYQAAAAAAAAABAAEEAQKDBAAAACVtZGF0EgAKCBgANogQEAwgMg8f8D\/\/\/8WfhwB8+ErK42A=&#39;,\n    webp: &#39;data:image\/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAwA0JaQAA3AA\/vuUAAA=&#39;\n  };\n  const support = {};\n  for (const [format, dataUrl] of Object.entries(formats)) {\n    support[format] = await new Promise((resolve) =&gt; {\n      const img = new Image();\n      img.onload = () =&gt; resolve(true);\n      img.onerror = () =&gt; resolve(false);\n      img.src = dataUrl;\n    });\n  }\n  return support;\n}\n\/\/ \u4f7f\u7528\u4f8b\ncheckImageFormatSupport().then((support) =&gt; {\n  console.log(&#39;AVIF\u5bfe\u5fdc:&#39;, support.avif);\n  console.log(&#39;WebP\u5bfe\u5fdc:&#39;, support.webp);\n  \/\/ HTML\u8981\u7d20\u306b\u30af\u30e9\u30b9\u3092\u8ffd\u52a0\n  if (support.avif) {\n    document.documentElement.classList.add(&#39;avif&#39;);\n  } else if (support.webp) {\n    document.documentElement.classList.add(&#39;webp&#39;);\n  }\n});\n<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">CSS\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u80cc\u666f\u753b\u50cf\u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af<\/h3>\n\n\n\n<p>JavaScript\u3067\u691c\u51fa\u3057\u305f\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u5bfe\u5fdc\u72b6\u6cc1\u3092CSS\u30af\u30e9\u30b9\u3068\u3057\u3066\u8ffd\u52a0\u3057\u3001\u80cc\u666f\u753b\u50cf\u3092\u5207\u308a\u66ff\u3048\u308b\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30c7\u30d5\u30a9\u30eb\u30c8\uff08JPEG\/PNG\uff09 *\/\n.hero-section {\n  background-image: url(&#39;hero.jpg&#39;);\n}\n\/* WebP\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6 *\/\n.webp .hero-section {\n  background-image: url(&#39;hero.webp&#39;);\n}\n\/* AVIF\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6 *\/\n.avif .hero-section {\n  background-image: url(&#39;hero.avif&#39;);\n}<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u5b9f\u88c5<\/h3>\n\n\n\n<p>Intersection Observer API\u3092\u4f7f\u3063\u3066\u3001\u753b\u9762\u306b\u8868\u793a\u3055\u308c\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u6700\u9069\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3080\u5b9f\u88c5\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ \u753b\u50cf\u306e\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3068\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u9078\u629e\nclass AdaptiveImageLoader {\n  constructor() {\n    this.formatSupport = null;\n    this.init();\n  }\n  async init() {\n    \/\/ \u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u5bfe\u5fdc\u3092\u691c\u51fa\n    this.formatSupport = await this.checkFormats();\n    \/\/ Intersection Observer\u3092\u8a2d\u5b9a\n    this.setupObserver();\n  }\n  async checkFormats() {\n    const formats = {\n      avif: &#39;data:image\/avif;base64,AAAAIGZ0eXBhdmlmAAAAAGF2aWZtaWYxbWlhZk1BMUIAAADybWV0YQAAAAAAAAAoaGRscgAAAAAAAAAAcGljdAAAAAAAAAAAAAAAAGxpYmF2aWYAAAAADnBpdG0AAAAAAAEAAAAeaWxvYwAAAABEAAABAAEAAAABAAABGgAAAB0AAAAoaWluZgAAAAAAAQAAABppbmZlAgAAAAABAABhdjAxQ29sb3IAAAAAamlwcnAAAABLaXBjbwAAABRpc3BlAAAAAAAAAAIAAAACAAAAEHBpeGkAAAAAAwgICAAAAAxhdjFDgQ0MAAAAABNjb2xybmNseAACAAIAAYAAAAAXaXBtYQAAAAAAAAABAAEEAQKDBAAAACVtZGF0EgAKCBgANogQEAwgMg8f8D\/\/\/8WfhwB8+ErK42A=&#39;,\n      webp: &#39;data:image\/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAwA0JaQAA3AA\/vuUAAA=&#39;\n    };\n    const support = {};\n    for (const [format, dataUrl] of Object.entries(formats)) {\n      support[format] = await new Promise((resolve) =&gt; {\n        const img = new Image();\n        img.onload = () =&gt; resolve(true);\n        img.onerror = () =&gt; resolve(false);\n        img.src = dataUrl;\n      });\n    }\n    return support;\n  }\n  setupObserver() {\n    const images = document.querySelectorAll(&#39;img[data-src]&#39;);\n    const observer = new IntersectionObserver((entries) =&gt; {\n      entries.forEach((entry) =&gt; {\n        if (entry.isIntersecting) {\n          this.loadImage(entry.target);\n          observer.unobserve(entry.target);\n        }\n      });\n    });\n    images.forEach((img) =&gt; observer.observe(img));\n  }\n  loadImage(img) {\n    const basePath = img.dataset.src;\n    let imagePath;\n    \/\/ \u5bfe\u5fdc\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306b\u5fdc\u3058\u3066\u753b\u50cf\u30d1\u30b9\u3092\u6c7a\u5b9a\n    if (this.formatSupport.avif) {\n      imagePath = basePath.replace(\/\\.(jpg|png)$\/, &#39;.avif&#39;);\n    } else if (this.formatSupport.webp) {\n      imagePath = basePath.replace(\/\\.(jpg|png)$\/, &#39;.webp&#39;);\n    } else {\n      imagePath = basePath;\n    }\n    \/\/ \u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3080\n    img.src = imagePath;\n    img.removeAttribute(&#39;data-src&#39;);\n  }\n}\n\/\/ \u521d\u671f\u5316\nnew AdaptiveImageLoader();<\/code><\/pre><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">HTML\u5074\u306e\u8a18\u8ff0<\/h4>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!-- data-src\u5c5e\u6027\u306b\u5143\u306e\u753b\u50cf\u30d1\u30b9\u3092\u6307\u5b9a --&gt;\n&lt;img data-src=&quot;images\/photo.jpg&quot; alt=&quot;\u5199\u771f&quot; class=&quot;lazy-image&quot;&gt;<\/code><\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d3\u30eb\u30c9\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u305f\u81ea\u52d5\u753b\u50cf\u5909\u63db\u3010\u958b\u767a\u74b0\u5883\u69cb\u7bc9\u7de8\u3011<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006678.jpg\" alt=\"\" class=\"wp-image-13277\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006678.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006678-768x512.jpg 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.40.37.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u753b\u50cf\u3092\u5909\u63db\u3057\u305f\u3044\u306e\u3067\u3059\u304c\u3001\u3059\u3054\u304f\u624b\u9593\u304c\u304b\u304b\u308a\u307e\u3059&#8230;\u3069\u3046\u3059\u308c\u3070\u826f\u3044\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.09.27.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u624b\u52d5\u3067\u8907\u6570\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u753b\u50cf\u3092\u7528\u610f\u3059\u308b\u306e\u306f\u5927\u5909\u3058\u3083\u3002\u30d3\u30eb\u30c9\u30c4\u30fc\u30eb\u3092\u4f7f\u3063\u3066\u81ea\u52d5\u5316\u3059\u308b\u306e\u3058\u3083\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">Webpack\u3067\u306e\u81ea\u52d5\u5909\u63db\u8a2d\u5b9a<\/h3>\n\n\n\n<p>webpack-image-loader\u3068image-webpack-loader\u3092\u4f7f\u3063\u305f\u8a2d\u5b9a\u4f8b\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ webpack.config.js\nconst ImageMinimizerPlugin = require(&#39;image-minimizer-webpack-plugin&#39;);\nmodule.exports = {\n  module: {\n    rules: [\n      {\n        test: \/\\.(jpe?g|png)$\/i,\n        type: &#39;asset\/resource&#39;,\n        generator: {\n          filename: &#39;images\/[name][ext]&#39;\n        }\n      }\n    ]\n  },\n  plugins: [\n    new ImageMinimizerPlugin({\n      generator: [\n        {\n          \/\/ AVIF\u751f\u6210\n          preset: &#39;avif&#39;,\n          implementation: ImageMinimizerPlugin.sharpGenerate,\n          options: {\n            encodeOptions: {\n              avif: {\n                quality: 80\n              }\n            }\n          }\n        },\n        {\n          \/\/ WebP\u751f\u6210\n          preset: &#39;webp&#39;,\n          implementation: ImageMinimizerPlugin.sharpGenerate,\n          options: {\n            encodeOptions: {\n              webp: {\n                quality: 85\n              }\n            }\n          }\n        }\n      ]\n    })\n  ]\n};<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Gulp\u3067\u306e\u81ea\u52d5\u5909\u63db\u30bf\u30b9\u30af<\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ gulpfile.js\nconst gulp = require(&#39;gulp&#39;);\nconst imagemin = require(&#39;gulp-imagemin&#39;);\nconst webp = require(&#39;gulp-webp&#39;);\nconst avif = require(&#39;gulp-avif&#39;);\n\/\/ WebP\u5909\u63db\u30bf\u30b9\u30af\ngulp.task(&#39;webp&#39;, () =&gt; {\n  return gulp.src(&#39;src\/images\/**\/*.{jpg,png}&#39;)\n    .pipe(webp({ quality: 85 }))\n    .pipe(gulp.dest(&#39;dist\/images&#39;));\n});\n\/\/ AVIF\u5909\u63db\u30bf\u30b9\u30af\ngulp.task(&#39;avif&#39;, () =&gt; {\n  return gulp.src(&#39;src\/images\/**\/*.{jpg,png}&#39;)\n    .pipe(avif({ quality: 80 }))\n    .pipe(gulp.dest(&#39;dist\/images&#39;));\n});\n\/\/ \u5143\u753b\u50cf\u306e\u6700\u9069\u5316\ngulp.task(&#39;images&#39;, () =&gt; {\n  return gulp.src(&#39;src\/images\/**\/*.{jpg,png}&#39;)\n    .pipe(imagemin())\n    .pipe(gulp.dest(&#39;dist\/images&#39;));\n});\n\/\/ \u3059\u3079\u3066\u306e\u753b\u50cf\u51e6\u7406\u3092\u5b9f\u884c\ngulp.task(&#39;default&#39;, gulp.parallel(&#39;webp&#39;, &#39;avif&#39;, &#39;images&#39;));<\/code><\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Next.js\u3067\u306e\u81ea\u52d5\u6700\u9069\u5316<\/h3>\n\n\n\n<p>Next.js\u306eImage\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u3001\u81ea\u52d5\u7684\u306b\u6700\u9069\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u753b\u50cf\u3092\u914d\u4fe1\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>\/\/ next.config.js\nmodule.exports = {\n  images: {\n    formats: [&#39;image\/avif&#39;, &#39;image\/webp&#39;],\n    deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],\n    imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],\n  }\n};\n\/\/ React\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\nimport Image from &#39;next\/image&#39;;\nfunction MyComponent() {\n  return (\n    &lt;Image\n      src=&quot;\/images\/photo.jpg&quot;\n      alt=&quot;\u5199\u771f&quot;\n      width={800}\n      height={600}\n      priority={false}\n    \/&gt;\n  );\n}<\/code><\/pre><\/div>\n\n\n\n<p>Next.js\u306f\u81ea\u52d5\u7684\u306b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d6\u30e9\u30a6\u30b6\u5bfe\u5fdc\u306b\u5fdc\u3058\u3066AVIF\/WebP\/JPEG\u3092\u914d\u4fe1<\/li>\n\n\n\n<li>\u30c7\u30d0\u30a4\u30b9\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u305f\u753b\u50cf\u30b5\u30a4\u30ba\u3092\u751f\u6210<\/li>\n\n\n\n<li>\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u5b9f\u88c5<\/li>\n\n\n\n<li>\u753b\u50cf\u3092\u6700\u9069\u5316\u3057\u3066\u30ad\u30e3\u30c3\u30b7\u30e5<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6e2c\u5b9a\u3068\u6700\u9069\u5316<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006679.jpg\" alt=\"\" class=\"wp-image-13278\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006679.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/1000006679-768x512.jpg 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u5b9f\u88c5\u5f8c\u3001\u5b9f\u969b\u306b\u3069\u306e\u7a0b\u5ea6\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u6539\u5584\u3055\u308c\u305f\u304b\u3092\u6e2c\u5b9a\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3058\u3083\uff01\u8a73\u3057\u304f\u89e3\u8aac\u3059\u308b\u304b\u3089\u3088\u30fc\u304f\u805e\u304f\u306e\u3058\u3083\u305e\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u5206\u304b\u308a\u307e\u3057\u305f\uff01\u3088\u308d\u3057\u304f\u304a\u9858\u3044\u3057\u307e\u3059\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<h3 class=\"wp-block-heading\">Chrome DevTools\u3067\u306e\u78ba\u8a8d\u65b9\u6cd5<\/h3>\n\n\n\n<p><a href=\"https:\/\/developer.chrome.com\/docs\/devtools?hl=ja\" title=\"\">Chrome DevTools<\/a>\u306eNetwork\u30bf\u30d6\u3067\u3001\u5b9f\u969b\u306b\u8aad\u307f\u8fbc\u307e\u308c\u3066\u3044\u308b\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Chrome DevTools\u3092\u958b\u304f\uff08F12\u30ad\u30fc\uff09<\/li>\n\n\n\n<li>Network\u30bf\u30d6\u3092\u9078\u629e<\/li>\n\n\n\n<li>Img\u30d5\u30a3\u30eb\u30bf\u30fc\u3092\u9078\u629e<\/li>\n\n\n\n<li>\u30da\u30fc\u30b8\u3092\u30ea\u30ed\u30fc\u30c9<\/li>\n\n\n\n<li>\u8aad\u307f\u8fbc\u307e\u308c\u305f\u753b\u50cf\u306eType\u30ab\u30e9\u30e0\u3067\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u78ba\u8a8d<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image size_s\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1970\" height=\"1372\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.02.43.jpg\" alt=\"\" class=\"wp-image-13360\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.02.43.jpg 1970w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.02.43-768x535.jpg 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.02.43-1536x1070.jpg 1536w\" sizes=\"(max-width: 1970px) 100vw, 1970px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">Lighthouse \u3067\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30b9\u30b3\u30a2\u6e2c\u5b9a<\/h3>\n\n\n\n<p>Lighthouse\u3092\u4f7f\u3063\u3066\u3001\u753b\u50cf\u6700\u9069\u5316\u306e\u52b9\u679c\u3092\u6570\u5024\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Chrome DevTools\u306eLighthouse\u30bf\u30d6\u3092\u958b\u304f<\/li>\n\n\n\n<li>\u300cPerformance\u300d\u3092\u9078\u629e\u3057\u3066\u30ec\u30dd\u30fc\u30c8\u751f\u6210<\/li>\n\n\n\n<li>\u300cOpportunities\u300d\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u753b\u50cf\u95a2\u9023\u306e\u6539\u5584\u63d0\u6848\u3092\u78ba\u8a8d<\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image size_s\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1956\" height=\"1342\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.05.29.png\" alt=\"\" class=\"wp-image-13361\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.05.29.png 1956w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.05.29-768x527.png 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.05.29-1536x1054.png 1536w\" sizes=\"(max-width: 1956px) 100vw, 1956px\" \/><\/figure>\n<\/div>\n\n\n<p>WebP\/AVIF\u3092\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u9805\u76ee\u3067\u30b9\u30b3\u30a2\u304c\u6539\u5584\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Largest Contentful Paint (LCP)<\/strong>\uff1a\u30e1\u30a4\u30f3\u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u6642\u9593\u304c\u77ed\u7e2e<\/li>\n\n\n\n<li><strong>Total Blocking Time (TBT)<\/strong>\uff1a\u753b\u50cf\u51e6\u7406\u306b\u3088\u308b\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0\u6642\u9593\u304c\u6e1b\u5c11<\/li>\n\n\n\n<li><strong>Speed Index<\/strong>\uff1a\u30da\u30fc\u30b8\u306e\u8996\u899a\u7684\u306a\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u304c\u5411\u4e0a<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image size_s\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"2212\" height=\"1274\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.12.30.png\" alt=\"\" class=\"wp-image-13362\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.12.30.png 2212w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.12.30-768x442.png 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.12.30-1536x885.png 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/02\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-03-30-15.12.30-2048x1180.png 2048w\" sizes=\"(max-width: 2212px) 100vw, 2212px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">\u5b9f\u969b\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6539\u5584\u4e8b\u4f8b<\/h3>\n\n\n\n<p>WithCode\u30e1\u30c7\u30a3\u30a2\u30b5\u30a4\u30c8\u3067\u6b21\u4e16\u4ee3\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u5c0e\u5165\u3057\u305f\u969b\u306e\u6539\u5584\u30c7\u30fc\u30bf\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u6307\u6a19<\/th><th>\u5c0e\u5165\u524d<\/th><th>WebP\u5c0e\u5165\u5f8c<\/th><th>AVIF\u5c0e\u5165\u5f8c<\/th><\/tr><\/thead><tbody><tr><td>\u753b\u50cf\u7dcf\u5bb9\u91cf<\/td><td>8.2MB<\/td><td>5.8MB (-29%)<\/td><td>4.1MB (-50%)<\/td><\/tr><tr><td>LCP<\/td><td>3.8\u79d2<\/td><td>2.4\u79d2 (-37%)<\/td><td>1.9\u79d2 (-50%)<\/td><\/tr><tr><td>Lighthouse\u30b9\u30b3\u30a2<\/td><td>72\u70b9<\/td><td>88\u70b9 (+16)<\/td><td>94\u70b9 (+22)<\/td><\/tr><tr><td>\u76f4\u5e30\u7387<\/td><td>45%<\/td><td>38% (-7%)<\/td><td>32% (-13%)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong><span class=\"swl-marker mark_yellow\">AVIF\u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u753b\u50cf\u5bb9\u91cf\u304c\u534a\u5206\u306b\u306a\u308a\u3001LCP\u304c50%\u6539\u5584\u3001Lighthouse\u30b9\u30b3\u30a2\u304c22\u70b9\u5411\u4e0a<\/span><\/strong>\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f\u3068\u6ce8\u610f\u70b9<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-2026\u5e742\u670828\u65e5-16_01_19.jpg\" alt=\"\" class=\"wp-image-12725\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-2026\u5e742\u670828\u65e5-16_01_19.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/01\/ChatGPT-Image-2026\u5e742\u670828\u65e5-16_01_19-768x512.jpg 768w\" sizes=\"(max-width: 1536px) 100vw, 1536px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">Q1: \u3059\u3079\u3066\u306e\u753b\u50cf\u3092WebP\/AVIF\u306b\u5909\u63db\u3059\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p><strong>A:<\/strong> \u57fa\u672c\u7684\u306b\u306f\u63a8\u5968\u3057\u307e\u3059\u304c\u3001\u4ee5\u4e0b\u306e\u5834\u5408\u306f\u4f8b\u5916\u3067\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u975e\u5e38\u306b\u5c0f\u3055\u3044\u753b\u50cf\uff085KB\u4ee5\u4e0b\uff09<\/strong>\uff1a\u5909\u63db\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u30e1\u30ea\u30c3\u30c8\u3092\u4e0a\u56de\u308b\u53ef\u80fd\u6027<\/li>\n\n\n\n<li><strong>\u30a2\u30a4\u30b3\u30f3\u3084\u30ed\u30b4<\/strong>\uff1aSVG\u306e\u65b9\u304c\u9069\u3057\u3066\u3044\u308b\u5834\u5408\u304c\u591a\u3044<\/li>\n\n\n\n<li><strong>\u5370\u5237\u7528\u753b\u50cf<\/strong>\uff1a\u8272\u7a7a\u9593\u306e\u554f\u984c\u3067PNG\u3084TIFF\u304c\u9069\u5207<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Q2: picture\u8981\u7d20\u306fSEO\u306b\u5f71\u97ff\u3057\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p><strong>A:<\/strong> picture\u8981\u7d20\u81ea\u4f53\u306fSEO\u306b\u60aa\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u305b\u3093\u3002\u3080\u3057\u308d\u3001\u4ee5\u4e0b\u306e\u7406\u7531\u3067SEO\u306b\u597d\u5f71\u97ff\u3067\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u304c\u5411\u4e0a\uff08Google\u306e\u30e9\u30f3\u30ad\u30f3\u30b0\u8981\u56e0\uff09<\/li>\n\n\n\n<li>Core Web Vitals\u306e\u6539\u5584<\/li>\n\n\n\n<li>\u30e2\u30d0\u30a4\u30eb\u30e6\u30fc\u30b6\u30fc\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\u306e\u5411\u4e0a<\/li>\n<\/ul>\n\n\n\n<p>\u305f\u3060\u3057\u3001<strong><span class=\"swl-marker mark_yellow\">img\u8981\u7d20\u306ealt\u5c5e\u6027\u306f\u5fc5\u305a\u8a2d\u5b9a<\/span><\/strong>\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306fimg\u8981\u7d20\u306ealt\u3092\u53c2\u7167\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q3: CDN\u3067WebP\/AVIF\u3092\u914d\u4fe1\u3067\u304d\u307e\u3059\u304b\uff1f<\/h3>\n\n\n\n<p><strong>A:<\/strong> \u591a\u304f\u306eCDN\u304cWebP\/AVIF\u306e\u81ea\u52d5\u5909\u63db\u30fb\u914d\u4fe1\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cloudflare<\/strong>\uff1aPolish\u6a5f\u80fd\u3067WebP\/AVIF\u3092\u81ea\u52d5\u914d\u4fe1<\/li>\n\n\n\n<li><strong>Cloudinary<\/strong>\uff1a\u81ea\u52d5\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u9078\u629e\u6a5f\u80fd\uff08f_auto\uff09<\/li>\n\n\n\n<li><strong>Imgix<\/strong>\uff1aauto=format\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u81ea\u52d5\u6700\u9069\u5316<\/li>\n\n\n\n<li><strong>AWS CloudFront + Lambda@Edge<\/strong>\uff1a\u30ab\u30b9\u30bf\u30e0\u30ed\u30b8\u30c3\u30af\u3067\u5b9f\u88c5\u53ef\u80fd<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Q4: \u753b\u50cf\u306e\u54c1\u8cea\u8a2d\u5b9a\u306f\u3069\u3046\u3059\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p><strong>A:<\/strong> \u63a8\u5968\u3055\u308c\u308b\u54c1\u8cea\u8a2d\u5b9a\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>AVIF<\/strong>\uff1aquality 75-85\uff08AVIF\u306f\u9ad8\u5727\u7e2e\u306a\u306e\u3067\u4f4e\u3081\u3067\u3082OK\uff09<\/li>\n\n\n\n<li><strong>WebP<\/strong>\uff1aquality 80-90<\/li>\n\n\n\n<li><strong>JPEG<\/strong>\uff1aquality 85-90\uff08\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u7528\u306a\u306e\u3067\u54c1\u8cea\u91cd\u8996\uff09<\/li>\n<\/ul>\n\n\n\n<p>\u5199\u771f\u306e\u7a2e\u985e\u306b\u3088\u3063\u3066\u8abf\u6574\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u98a8\u666f\u5199\u771f\uff1a\u3084\u3084\u4f4e\u3081\uff0870-80\uff09\u3067\u3082\u8a31\u5bb9<\/li>\n\n\n\n<li>\u4eba\u7269\u5199\u771f\uff1a\u9ad8\u3081\uff0885-90\uff09\u3092\u63a8\u5968<\/li>\n\n\n\n<li>\u88fd\u54c1\u5199\u771f\uff1a\u9ad8\u54c1\u8cea\uff0890-95\uff09\u304c\u671b\u307e\u3057\u3044<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Q5: OGP\u753b\u50cf\u3082WebP\/AVIF\u306b\u3059\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p><strong>A:<\/strong> OGP\uff08Open Graph Protocol\uff09\u753b\u50cf\u306f<strong><span class=\"swl-marker mark_yellow\">JPEG\/PNG\u306e\u307e\u307e\u306b\u3059\u308b\u3053\u3068\u3092\u63a8\u5968<\/span><\/strong>\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u7406\u7531\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u3059\u3079\u3066\u306eSNS\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u304cWebP\/AVIF\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u306a\u3044<\/li>\n\n\n\n<li>Facebook\u3001Twitter\u3001LINE\u306a\u3069\u306f\u5f93\u6765\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u63a8\u5968<\/li>\n\n\n\n<li>\u30b7\u30a7\u30a2\u6642\u306b\u753b\u50cf\u304c\u8868\u793a\u3055\u308c\u306a\u3044\u30ea\u30b9\u30af\u3092\u907f\u3051\u308b\u305f\u3081<\/li>\n<\/ul>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>picture\u8981\u7d20\u3092\u4f7f\u3048\u3070\u3001JavaScript\u306a\u3057\u3067\u7c21\u5358\u306b\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u304c\u5b9f\u88c5\u3067\u304d\u308b\u3093\u3067\u3059\u306d\uff01\u65e9\u901f\u8a66\u3057\u3066\u307f\u307e\u3059\u3002<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u305d\u306e\u610f\u6c17\u3058\u3083\uff01\u753b\u50cf\u6700\u9069\u5316\u306fWeb\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6539\u5584\u306e\u8981\u3058\u3083\u304b\u3089\u306a\u3002\u307e\u305a\u306f1\u3064\u306e\u30da\u30fc\u30b8\u304b\u3089\u8a66\u3057\u3066\u3001\u52b9\u679c\u3092\u78ba\u8a8d\u3057\u3066\u307f\u308b\u3093\u3058\u3083\u305e\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" 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