{"id":5483,"date":"2024-07-23T07:13:01","date_gmt":"2024-07-23T07:13:01","guid":{"rendered":"https:\/\/withcode.tech\/media\/?p=5483"},"modified":"2026-10-19T21:25:32","modified_gmt":"2026-10-19T21:25:32","slug":"image-switching-for-each-device","status":"publish","type":"post","link":"https:\/\/withcode.tech\/media\/image-switching-for-each-device\/","title":{"rendered":"PC\u30fb\u30b9\u30de\u30db\u3067\u753b\u50cf\u3092\u5207\u308a\u66ff\u3048\u308b\u65b9\u6cd5\uff5cCSS\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u5b9f\u4f8b"},"content":{"rendered":"\n<!-- withmedia-ketsuron -->\n<h2 class=\"wp-block-heading\">\u3053\u306e\u8a18\u4e8b\u306e\u7d50\u8ad6<\/h2>\n\n\n<figure class=\"wp-block-image size-large withmedia-access-priority-next3\" data-withmedia-image=\"withmedia-next3-5483-h2-01\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-01.webp\" alt=\"\u3053\u306e\u8a18\u4e8b\u306e\u7d50\u8ad6\" 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class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p><strong>\u30da\u30f3\u535a\u58eb\uff01\u3053\u306e\u524dWeb\u30b5\u30a4\u30c8\u3092\u4f5c\u3063\u305f\u3093\u3067\u3059\u3051\u3069\u3001\u30b9\u30de\u30db\u3067\u898b\u308b\u3068\u30d0\u30ca\u30fc\u304c\u3059\u3054\u304f\u5c0f\u3055\u304f\u306a\u3063\u3066\u3057\u307e\u3063\u3066\u2026\u3002PC\u3068\u30b9\u30de\u30db\u3067\u8868\u793a\u3092\u5207\u308a\u66ff\u3048\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3093\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\u30c8-2025-06-15-15.08.37.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 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wp-block-paragraph\"><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 class=\"wp-block-paragraph\">\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 is-style-balloon_box2 wp-block-paragraph\"><strong>\u4e2d\u7530\u3055\u3093\u306e\u4e3b\u306a\u5236\u4f5c\u5b9f\u7e3e\u306f\u3053\u3061\u3089<\/strong><\/p>\n\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\u898f\u30d7\u30ed\u30c0\u30af\u30c8\u7528\u306e\u5546\u54c1\u7d39\u4ecb\u30da\u30fc\u30b8\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\u30c8-2025-06-29-14.53.45.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\/hagiwara_industries\/\" 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<h2 class=\"wp-block-heading\">\u306a\u305c\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30d0\u30ca\u30fc\u5bfe\u5fdc\u304c\u5fc5\u9808\u306a\u306e\u304b\uff1f<\/h2>\n\n<figure class=\"wp-block-image size-large withmedia-access-priority-next3\" data-withmedia-image=\"withmedia-next3-5483-h2-02\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-02.webp\" alt=\"\u306a\u305c\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30d0\u30ca\u30fc\u5bfe\u5fdc\u304c\u5fc5\u9808\u306a\u306e\u304b\uff1f\" class=\"wp-image-26573\" width=\"1672\" height=\"941\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-02.webp 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-02-768x432.webp 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-02-1536x864.webp 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n\n\n\n\n<p class=\"wp-block-paragraph\">\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30c7\u30b6\u30a4\u30f3\u3068\u306f\u3001Web\u30da\u30fc\u30b8\u304c<strong><span class=\"swl-marker mark_yellow\">PC\u3001\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3001\u30bf\u30d6\u30ec\u30c3\u30c8\u306a\u3069\u7570\u306a\u308b\u30c7\u30d0\u30a4\u30b9\u306e\u753b\u9762\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u3066\u3001\u81ea\u52d5\u7684\u306b\u6700\u9069\u306a\u30ec\u30a4\u30a2\u30a6\u30c8\u306b\u5909\u308f\u308b<\/span><\/strong>\u30c7\u30b6\u30a4\u30f3\u624b\u6cd5\u3067\u3059\u3002\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u3092\u3059\u308b\u3053\u3068\u3067\u4ee5\u4e0b\u306e\u30e1\u30ea\u30c3\u30c8\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-big_icon_point wp-block-paragraph\"><strong>\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u306e\u5411\u4e0a<\/strong><br>\u30c7\u30d0\u30a4\u30b9\u306b\u9069\u3057\u305f\u753b\u50cf\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u3067\u3001\u95b2\u89a7\u4f53\u9a13\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<br><br><strong>\u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u306e\u6700\u9069\u5316<\/strong><br>\u9069\u5207\u306a\u30b5\u30a4\u30ba\u306e\u753b\u50cf\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4e0d\u8981\u306a\u30c7\u30fc\u30bf\u8ee2\u9001\u3092\u6e1b\u3089\u3057\u3001\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u3092\u5411\u4e0a\u3055\u305b\u307e\u3059\u3002<br><br><strong>SEO\u5bfe\u7b56<\/strong><br>Google\u306f\u30e2\u30d0\u30a4\u30eb\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u306a\u30b5\u30a4\u30c8\u3092\u9ad8\u304f\u8a55\u4fa1\u3059\u308b\u305f\u3081\u3001\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u306f\u691c\u7d22\u9806\u4f4d\u306e\u5411\u4e0a\u306b\u3082\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30c7\u30b6\u30a4\u30f3\u306b\u3064\u3044\u3066\u306f\u3001<a href=\"https:\/\/withcode.tech\/media\/how-to-create-responsive-design\/\" target=\"_blank\" rel=\"noopener\" title=\"\u5b9f\u8df5\u30ac\u30a4\u30c9\uff01\u30b9\u30de\u30db\u30fb\u30bf\u30d6\u30ec\u30c3\u30c8\u306b\u5bfe\u5fdc\u3059\u308b\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30c7\u30b6\u30a4\u30f3\u4f5c\u6210\u65b9\u6cd5\">\u3053\u3061\u3089\u306e\u8a18\u4e8b<\/a>\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-wp-embed is-provider-withcode-media wp-block-embed-withcode-media\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/withcode.tech\/media\/how-to-create-responsive-design\/\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">CSS\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u4f7f\u3063\u305f\u5b9f\u88c5\u65b9\u6cd55\u30b9\u30c6\u30c3\u30d7<\/h2>\n\n<figure class=\"wp-block-image size-large withmedia-access-priority-next3\" data-withmedia-image=\"withmedia-next3-5483-h2-03\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-03.webp\" alt=\"CSS\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u4f7f\u3063\u305f\u5b9f\u88c5\u65b9\u6cd55\u30b9\u30c6\u30c3\u30d7\" class=\"wp-image-26574\" width=\"1672\" height=\"941\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-03.webp 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-03-768x432.webp 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-03-1536x864.webp 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n\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\/\u30a2\u30bb\u30c3\u30c8-6@4x-2.png\" 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>\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30c7\u30b6\u30a4\u30f3\u3092\u610f\u8b58\u3057\u3001\u30c7\u30d0\u30a4\u30b9\u3054\u3068\u306b\u9069\u5207\u306a\u753b\u50cf\u3092\u914d\u7f6e\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u3088\u308a\u898b\u3084\u3059\u3044\u753b\u9762\u8868\u793a\u3092\u5b9f\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u3053\u3053\u3067\u306f\u3001\u305d\u306e\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u3066\u3044\u304f\u305e\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\">1. CSS\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u305f\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u65b9\u6cd5\u306f\u3001PC\uff08\u30d1\u30bd\u30b3\u30f3\uff09\u3068SP\uff08\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\uff09\u7528\u306e\u7570\u306a\u308b\u753b\u50cf\u3092\u7528\u610f\u3057\u3001CSS\u3067\u5207\u308a\u66ff\u3048\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">HTML\u69cb\u9020<\/h4>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;div class=&quot;banner&quot;&gt;\n  &lt;img src=&quot;banner-pc.jpg&quot; alt=&quot;PC\u7528\u30d0\u30ca\u30fc&quot; class=&quot;banner-pc&quot;&gt;\n  &lt;img src=&quot;banner-sp.jpg&quot; alt=&quot;SP\u7528\u30d0\u30ca\u30fc&quot; class=&quot;banner-sp&quot;&gt;\n&lt;\/div&gt;<\/code><\/pre><\/div>\n\n\n\n<h5 class=\"wp-block-heading has-medium-font-size\"><strong>\u89e3\u8aac<\/strong><\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>2\u3064\u306e<code>&lt;img&gt;<\/code>\u8981\u7d20\u3092\u7528\u610f\u3057\u3001\u305d\u308c\u305e\u308c\u306bPC\u7528\u3068SP\u7528\u306e\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li>\u4e21\u65b9\u306e\u753b\u50cf\u3092\u5e38\u306bHTML\u306b\u914d\u7f6e\u3057\u3066\u304a\u304d\u3001CSS\u3067\u8868\u793a\/\u975e\u8868\u793a\u3092\u5236\u5fa1\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">CSS\u5b9f\u88c5<\/h4>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5171\u901a\u30b9\u30bf\u30a4\u30eb *\/\n.banner {\n  width: 100%;\n  max-width: 1200px;\n  margin: 0 auto;\n}\n\n.banner img {\n  width: 100%;\n  height: auto;\n}\n\n\/* \u30c7\u30d5\u30a9\u30eb\u30c8\u3067PC\u7528\u753b\u50cf\u3092\u8868\u793a\u3001SP\u7528\u753b\u50cf\u3092\u975e\u8868\u793a *\/\n.banner-pc {\n  display: block;\n}\n\n.banner-sp {\n  display: none;\n}\n\n\/* \u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u5411\u3051\u306e\u30b9\u30bf\u30a4\u30eb *\/\n@media screen and (max-width: 767px) {\n  .banner-pc {\n    display: none;\n  }\n\n  .banner-sp {\n    display: block;\n  }\n}<\/code><\/pre><\/div>\n\n\n\n<h5 class=\"wp-block-heading has-medium-font-size\"><strong>\u89e3\u8aac<\/strong><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">1. \u30c7\u30d5\u30a9\u30eb\u30c8\u8a2d\u5b9a\uff08PC\u5411\u3051\uff09<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>.banner-pc { display: block; }<\/code>: PC\u7528\u753b\u50cf\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><code>.banner-sp { display: none; }<\/code>: SP\u7528\u753b\u50cf\u3092\u975e\u8868\u793a\u306b\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">2. \u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u5411\u3051\u306e\u8a2d\u5b9a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>@media screen and (max-width: 767px) { ... }<\/code>: \u753b\u9762\u5e45\u304c767px\u4ee5\u4e0b\u306e\u5834\u5408\u306b\u9069\u7528\u3055\u308c\u308b\u30b9\u30bf\u30a4\u30eb\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u3001\u30c7\u30d0\u30a4\u30b9\u3054\u3068\u306eCSS\u5b9a\u7fa9\u3092<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/CSS\/CSS_media_queries\/Using_media_queries\" target=\"_blank\" rel=\"noopener\" title=\"\">\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea<\/a>\u3068\u8a00\u3044\u307e\u3059\u3002<\/li>\n\n\n\n<li><code>.banner-pc { display: none; }<\/code>: PC\u7528\u753b\u50cf\u3092\u975e\u8868\u793a\u306b\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><code>.banner-sp { display: block; }<\/code>: SP\u7528\u753b\u50cf\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u5b9f\u88c5\u306b\u3088\u308a\u3001\u4ee5\u4e0b\u306e\u52d5\u4f5c\u304c\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u753b\u9762\u5e45\u304c768px\u4ee5\u4e0a\u306e\u5834\u5408\u3001PC\u7528\u306e\u753b\u50cf\u306e\u307f\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"2560\" height=\"416\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/07\/\u30d0\u30ca\u30fc\u753b\u50cfPC-scaled.jpg\" alt=\"1. CSS\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u305f\u65b9\u6cd5\" class=\"wp-image-5487\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/07\/\u30d0\u30ca\u30fc\u753b\u50cfPC-scaled.jpg 2560w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/07\/\u30d0\u30ca\u30fc\u753b\u50cfPC-768x125.jpg 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/07\/\u30d0\u30ca\u30fc\u753b\u50cfPC-1536x249.jpg 1536w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/07\/\u30d0\u30ca\u30fc\u753b\u50cfPC-2048x332.jpg 2048w\" sizes=\"(max-width: 2560px) 100vw, 2560px\" \/><\/figure>\n<\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>\u753b\u9762\u5e45\u304c767px\u4ee5\u4e0b\u306e\u5834\u5408\u3001SP\u7528\u306e\u753b\u50cf\u306e\u307f\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" width=\"1284\" height=\"646\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/07\/\u30d0\u30ca\u30fc\u753b\u50cfSP.jpg\" alt=\"1. CSS\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u4f7f\u7528\u3057\u305f\u65b9\u6cd5\" class=\"wp-image-5488\" style=\"object-fit:cover\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/07\/\u30d0\u30ca\u30fc\u753b\u50cfSP.jpg 1284w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2024\/07\/\u30d0\u30ca\u30fc\u753b\u50cfSP-768x386.jpg 768w\" sizes=\"(max-width: 1284px) 100vw, 1284px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">2. srcset\u5c5e\u6027\u3092\u4f7f\u7528\u3057\u305f\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>srcset<\/code>\u5c5e\u6027\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u9069\u5207\u306a\u753b\u50cf\u3092\u9078\u629e\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;img src=&quot;banner-default.jpg&quot; \n     srcset=&quot;banner-sp.jpg 480w, banner-tablet.jpg 768w, banner-pc.jpg 1200w&quot;\n     sizes=&quot;(max-width: 480px) 100vw, (max-width: 768px) 50vw, 33vw&quot;\n     alt=&quot;\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30d0\u30ca\u30fc&quot;&gt;<\/code><\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>srcset<\/code>: \u30c7\u30d0\u30a4\u30b9\u306e\u753b\u9762\u5e45\u306b\u5fdc\u3058\u3066\u4f7f\u7528\u3059\u308b\u753b\u50cf\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/li>\n\n\n\n<li><code>sizes<\/code>: \u753b\u9762\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u3066\u3001\u753b\u50cf\u304c\u3069\u306e\u304f\u3089\u3044\u306e\u5e45\u3067\u8868\u793a\u3055\u308c\u308b\u304b\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. picture\u8981\u7d20\u3092\u4f7f\u7528\u3057\u305f\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>picture<\/code>\u8981\u7d20\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u3088\u308a\u7d30\u304b\u3044\u5236\u5fa1\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/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;source media=&quot;(max-width: 480px)&quot; srcset=&quot;banner-sp.jpg&quot;&gt;\n  &lt;source media=&quot;(max-width: 768px)&quot; srcset=&quot;banner-tablet.jpg&quot;&gt;\n  &lt;img src=&quot;banner-pc.jpg&quot; alt=&quot;\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30d0\u30ca\u30fc&quot;&gt;\n&lt;\/picture&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u65b9\u6cd5\u3067\u306f\u3001\u6307\u5b9a\u3057\u305f\u6761\u4ef6\u306b\u5408\u81f4\u3059\u308b\u6700\u521d\u306e<code>source<\/code>\u8981\u7d20\u306e\u753b\u50cf\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u4e0a\u8a18\u3067\u306f\u3001\u8868\u793a\u90e8\u5206\u304c480px\u307e\u3067\u306f<code>banner-sp.jpg<\/code>\u304c\u3001768px\u307e\u3067\u306f<code>banner-tablet.jpg<\/code>\u304c\u3001\u305d\u308c\u4ee5\u4e0a\u306e\u5927\u304d\u3055\u306e\u5834\u5408\u306f\u3001<code>banner-pc.jpg<\/code>\u304c\u9069\u7528\u3055\u308c\u308b\u4ed5\u7d44\u307f\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30d0\u30ca\u30fc\u8868\u793a\u3092\u6700\u9069\u5316\u3059\u308b3\u3064\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5bfe\u7b56<\/h2>\n\n<figure class=\"wp-block-image size-large withmedia-access-priority-next3\" data-withmedia-image=\"withmedia-next3-5483-h2-04\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-04.webp\" alt=\"\u30d0\u30ca\u30fc\u8868\u793a\u3092\u6700\u9069\u5316\u3059\u308b3\u3064\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5bfe\u7b56\" class=\"wp-image-26575\" width=\"1672\" height=\"941\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-04.webp 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-04-768x432.webp 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-04-1536x864.webp 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n\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\/\u30a2\u30bb\u30c3\u30c8-6@4x-2.png\" 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>\u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u6570\u304c\u5897\u3048\u308b\u3068\u3001\u305d\u308c\u306b\u4f34\u3044\u8868\u793a\u6642\u9593\u304c\u9045\u5ef6\u3057\u305f\u308a\u3068\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u843d\u3061\u3066\u3057\u307e\u3046\u3053\u3068\u304c\u3042\u308b\u3002\u305d\u306e\u5834\u5408\u306e\u5bfe\u7b56\u3068\u3057\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u65b9\u6cd5\u304c\u6319\u3052\u3089\u308c\u308b\u305e\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<p class=\"is-style-big_icon_check wp-block-paragraph\"><strong>\u753b\u50cf\u306e\u5727\u7e2e<\/strong><br>\u5404\u30c7\u30d0\u30a4\u30b9\u7528\u306b\u6700\u9069\u5316\u3055\u308c\u305f\u753b\u50cf\u3092\u7528\u610f\u3057\u3001\u4e0d\u8981\u306a\u30c7\u30fc\u30bf\u3092\u524a\u6e1b\u3057\u307e\u3059\u3002<br><br><strong>\u9045\u5ef6\u8aad\u307f\u8fbc\u307f<\/strong><br>\u753b\u9762\u5916\u306e\u753b\u50cf\u306f\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u4f7f\u7528\u3057\u3001\u521d\u671f\u8aad\u307f\u8fbc\u307f\u6642\u9593\u3092\u77ed\u7e2e\u3057\u307e\u3059\u3002<br><br><strong>\u6b21\u4e16\u4ee3\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u4f7f\u7528<\/strong><br>WebP\uff082010\u5e74\u306bGoogle\u304c\u958b\u767a\u3057\u305f\u65b0\u578b\u306e\u753b\u50cf\u30d5\u30a1\u30a4\u30eb\u5f62\u5f0f\uff09\u306a\u3069\u306e\u6b21\u4e16\u4ee3\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u4f7f\u7528\u3057\u3001\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u524a\u6e1b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u308c\u3089\u306e\u65b9\u6cd5\u3092\u6d3b\u304b\u3059\u3053\u3068\u3067\u3001\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u3092\u4e0a\u3052\u308b\u3053\u3068\u304c\u53ef\u80fd\u306b\u306a\u308a\u3001\u3088\u308a\u9ad8\u3044\u30e6\u30fc\u30b6\u4f53\u9a13\u3092\u5b9f\u73fe\u3067\u304d\u308b\u3067\u3057\u3087\u3046\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\u30c8-2025-06-15-14.48.08.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>\u306a\u308b\u307b\u3069\uff01\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u4f7f\u3048\u3070\u3001\u30b9\u30de\u30db\u3084PC\u3054\u3068\u306b\u30d0\u30ca\u30fc\u3092\u5207\u308a\u66ff\u3048\u3089\u308c\u308b\u3093\u3067\u3059\u306d\uff01\u3053\u308c\u3067\u898b\u3084\u3059\u3055\u304c\u30b0\u30c3\u3068\u4e0a\u304c\u308a\u305d\u3046\u3067\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<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\u3001\u305d\u306e\u901a\u308a\u3058\u3083\u3002\u30dd\u30a4\u30f3\u30c8\u306f <strong>\u753b\u9762\u30b5\u30a4\u30ba\u3092\u610f\u8b58\u3057\u305f\u8a2d\u8a08<\/strong> \u3068\u3001\u3069\u306e\u30b5\u30a4\u30ba\u3092\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u3059\u308b\u304b\u3092\u6700\u521d\u306b\u6c7a\u3081\u3066\u304a\u304f\u3053\u3068\u3058\u3083\u3088\u3002\u305d\u3046\u3059\u308c\u3070\u52b9\u7387\u7684\u306b\u30c7\u30b6\u30a4\u30f3\u3092\u4f5c\u308c\u308b\u3002\u3057\u3063\u304b\u308a\u6d3b\u7528\u3057\u3066\u3001\u3088\u308a\u8cea\u306e\u9ad8\u3044Web\u30b5\u30a4\u30c8\u3092\u4f5c\u3063\u3066\u3044\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\u30c8-2025-06-15-15.06.05.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>\u306f\u3044\uff01\u3053\u308c\u3067\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u5feb\u9069\u306a\u8868\u793a\u3092\u610f\u8b58\u3057\u3066\u4f5c\u3063\u3066\u3044\u3051\u305d\u3046\u3067\u3059\uff01\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3057\u305f\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<h2 class=\"wp-block-heading\">\u307e\u3068\u3081\uff1a\u753b\u9762\u30b5\u30a4\u30ba\u5bfe\u5fdc\u3067\u96e2\u8131\u7387\u3092\u524a\u6e1b<\/h2>\n\n<figure class=\"wp-block-image size-large withmedia-access-priority-next3\" data-withmedia-image=\"withmedia-next3-5483-h2-05\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-05.webp\" alt=\"\u307e\u3068\u3081\uff1a\u753b\u9762\u30b5\u30a4\u30ba\u5bfe\u5fdc\u3067\u96e2\u8131\u7387\u3092\u524a\u6e1b\" class=\"wp-image-26576\" width=\"1672\" height=\"941\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-05.webp 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-05-768x432.webp 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-05-1536x864.webp 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n\n\n\n\n\n<p class=\"wp-block-paragraph\">\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u306e\u753b\u50cf\u5b9f\u88c5\u306f\u3001<strong><span class=\"swl-marker mark_yellow\">Web\u30b5\u30a4\u30c8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u3092\u5927\u304d\u304f\u5411\u4e0a\u3055\u305b\u307e\u3059<\/span>\u3002<\/strong>\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u6700\u9069\u306a\u65b9\u6cd5\u3092\u4ee5\u4e0b\u304b\u3089\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"is-style-big_icon_check wp-block-paragraph\"><strong>\u30fbCSS\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea<\/strong><br><strong>\u30fbsrcset\u5c5e\u6027<\/strong><br><strong>\u30fbpicture\u8981\u7d20<\/strong>\u306a\u3069<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9069\u5207\u306a\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u753b\u50cf\u5bfe\u5fdc\u3092\u884c\u3046\u3053\u3068\u3067\u3001\u30e2\u30d0\u30a4\u30eb\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u306a\u30b5\u30a4\u30c8\u4f5c\u308a\u304c\u3067\u304d\u3001SEO\u9762\u3067\u3082\u6709\u5229\u306b\u306a\u308a\u307e\u3059\u3002\u30c7\u30d0\u30a4\u30b9\u306e\u6700\u65b0\u7248\u304c\u51fa\u308b\u306a\u3069\u5909\u5316\u304c\u8d77\u304d\u3084\u3059\u3044\u90e8\u5206\u3067\u306f\u3042\u308b\u306e\u3067\u3001\u5e38\u306b\u6700\u65b0\u306eWeb\u6a19\u6e96\u306b\u6ce8\u76ee\u3057\u3001\u52b9\u679c\u7684\u306a\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30c7\u30b6\u30a4\u30f3\u3092\u5b9f\u73fe\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<!-- withmedia-related -->\n<h2 class=\"wp-block-heading\">\u95a2\u9023\u8a18\u4e8b<\/h2>\n\n\n<figure class=\"wp-block-image size-large withmedia-access-priority-next3\" data-withmedia-image=\"withmedia-next3-5483-h2-06\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-06.webp\" alt=\"\u95a2\u9023\u8a18\u4e8b\" class=\"wp-image-26577\" width=\"1672\" height=\"941\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-06.webp 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-06-768x432.webp 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-06-1536x864.webp 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/withcode.tech\/media\/webdesigner_hard_work\">Web\u30c7\u30b6\u30a4\u30ca\u30fc\u306f\u304d\u3064\u304f\u3066\u5927\u5909\uff01\u514b\u670d\u3059\u308b\u65b9\u6cd5\u3082\u3054\u7d39\u4ecb\uff01<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/is-web-production-dead\/\">Web\u5236\u4f5c\u306f\u30aa\u30ef\u30b3\u30f3\uff1f\u7406\u7531\u3068\u771f\u76f8\u3001\u5bfe\u7b56\u30dd\u30a4\u30f3\u30c8\u3092\u89e3\u8aac<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/is-web-design-dead\/\">Web\u30c7\u30b6\u30a4\u30f3\u306f\u30aa\u30ef\u30b3\u30f3\uff1f \u771f\u76f8\u3068\u30c7\u30b6\u30a4\u30ca\u30fc\u304c\u751f\u304d\u6b8b\u308b\u305f\u3081\u306e3\u3064\u306e\u6226\u7565<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/web-accessibility-policy-template\/\">\u3010\u5b8c\u5168\u4fdd\u5b58\u7248\u3011Web\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u65b9\u91dd\u7b56\u5b9a\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\uff5cWCAG\u30fbJIS\u6e96\u62e0\u30ac\u30a4\u30c9<\/a><\/li>\n<li><a href=\"https:\/\/withcode.tech\/media\/jis-x-8341-3-conformance-levels\/\">\u3010\u5b8c\u5168\u30ac\u30a4\u30c9\u3011JIS X 8341-3\u306e\u9069\u5408\u30ec\u30d9\u30eb\u78ba\u8a8d\u65b9\u6cd5\uff5cA\u30fbAA\u30fbAAA\u306e\u9055\u3044\u3068\u8a66\u9a13\u624b\u9806\u3092\u5fb9\u5e95\u89e3\u8aac<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<!-- withmedia-references -->\n<h2 class=\"wp-block-heading\">\u53c2\u8003\u30ea\u30f3\u30af\uff08\u516c\u5f0f\u30fb\u4e00\u6b21\u60c5\u5831\uff09<\/h2>\n\n\n<figure class=\"wp-block-image size-large withmedia-access-priority-next3\" data-withmedia-image=\"withmedia-next3-5483-h2-07\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-07.webp\" alt=\"\u53c2\u8003\u30ea\u30f3\u30af\uff08\u516c\u5f0f\u30fb\u4e00\u6b21\u60c5\u5831\uff09\" class=\"wp-image-26578\" width=\"1672\" height=\"941\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-07.webp 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-07-768x432.webp 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-07-1536x864.webp 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/developers.google.com\/search\/docs\/fundamentals\/seo-starter-guide?hl=ja\" target=\"_blank\" rel=\"noopener noreferrer\">Google \u691c\u7d22\u30bb\u30f3\u30c8\u30e9\u30eb\uff08SEO\u30b9\u30bf\u30fc\u30bf\u30fc\u30ac\u30a4\u30c9\uff09<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<!-- withmedia-faq -->\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09<\/h2>\n\n\n<figure class=\"wp-block-image size-large withmedia-access-priority-next3\" data-withmedia-image=\"withmedia-next3-5483-h2-08\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-08.webp\" alt=\"\u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09\" class=\"wp-image-26579\" width=\"1672\" height=\"941\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-08.webp 1672w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-08-768x432.webp 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/10\/image-switching-for-each-device-h2-08-1536x864.webp 1536w\" sizes=\"(max-width: 1672px) 100vw, 1672px\" \/><\/figure>\n\n\n\n\n<h3 class=\"wp-block-heading\">Q1. CSS\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067\u30d0\u30ca\u30fc\u3092\u5207\u308a\u66ff\u3048\u308b\u65b9\u6cd5\u306f\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> PC\u7528\u3068SP\u7528\u306e2\u3064\u306eimg\u8981\u7d20\u3092\u7528\u610f\u3057\u3001\u305d\u308c\u305e\u308c\u306b\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3057\u3066\u4e21\u65b9\u3092HTML\u306b\u914d\u7f6e\u3057\u307e\u3059\u3002CSS\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u306fPC\u7528\u3092\u8868\u793a\u30fbSP\u7528\u3092\u975e\u8868\u793a\u306b\u3057\u3001@media screen and (max-width: 767px)\u306e\u4e2d\u3067PC\u7528\u3092\u975e\u8868\u793a\u30fbSP\u7528\u3092\u8868\u793a\u306b\u5207\u308a\u66ff\u3048\u307e\u3059\u3002\u3053\u308c\u3067\u753b\u9762\u5e45768px\u4ee5\u4e0a\u306a\u3089PC\u7528\u3001767px\u4ee5\u4e0b\u306a\u3089SP\u7528\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q2. \u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> \u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u306f\u3001\u753b\u9762\u5e45\u306a\u3069\u30c7\u30d0\u30a4\u30b9\u306e\u6761\u4ef6\u306b\u5fdc\u3058\u3066\u9069\u7528\u3059\u308bCSS\u3092\u5b9a\u7fa9\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002\u305f\u3068\u3048\u3070@media screen and (max-width: 767px)\u3068\u66f8\u304f\u3068\u3001\u753b\u9762\u5e45\u304c767px\u4ee5\u4e0b\u306e\u5834\u5408\u306b\u306e\u307f\u9069\u7528\u3055\u308c\u308b\u30b9\u30bf\u30a4\u30eb\u3092\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u30c7\u30d0\u30a4\u30b9\u3054\u3068\u306b\u6700\u9069\u306a\u30ec\u30a4\u30a2\u30a6\u30c8\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q3. srcset\u5c5e\u6027\u3084picture\u8981\u7d20\u3068\u306e\u9055\u3044\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> srcset\u5c5e\u6027\u3092\u4f7f\u3046\u3068\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u30c7\u30d0\u30a4\u30b9\u306e\u753b\u9762\u5e45\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u753b\u50cf\u3092\u81ea\u52d5\u9078\u629e\u3057\u307e\u3059\u3002picture\u8981\u7d20\u306fsource\u8981\u7d20\u3067\u6761\u4ef6\u3092\u7d30\u304b\u304f\u6307\u5b9a\u3067\u304d\u3001480px\u307e\u3067\u306fSP\u7528\u3001768px\u307e\u3067\u306f\u30bf\u30d6\u30ec\u30c3\u30c8\u7528\u3001\u305d\u308c\u4ee5\u4e0a\u306fPC\u7528\u3068\u3044\u3063\u305f\u5236\u5fa1\u304c\u53ef\u80fd\u3067\u3059\u3002\u3088\u308a\u7d30\u304b\u3044\u5236\u5fa1\u304c\u5fc5\u8981\u306a\u5834\u5408\u306fpicture\u8981\u7d20\u304c\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q4. \u306a\u305c\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30d0\u30ca\u30fc\u5bfe\u5fdc\u304c\u5fc5\u8981\u306a\u306e\u3067\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> \u30c7\u30d0\u30a4\u30b9\u306b\u9069\u3057\u305f\u753b\u50cf\u3092\u8868\u793a\u3059\u308b\u3053\u3068\u3067\u30e6\u30fc\u30b6\u30fc\u306e\u95b2\u89a7\u4f53\u9a13\u304c\u5411\u4e0a\u3057\u3001\u9069\u5207\u306a\u30b5\u30a4\u30ba\u306e\u753b\u50cf\u3092\u4f7f\u3046\u3053\u3068\u3067\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u3082\u6700\u9069\u5316\u3055\u308c\u307e\u3059\u3002\u307e\u305fGoogle\u306f\u30e2\u30d0\u30a4\u30eb\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u306a\u30b5\u30a4\u30c8\u3092\u9ad8\u304f\u8a55\u4fa1\u3059\u308b\u305f\u3081\u3001\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u306fSEO\u9762\u3067\u3082\u691c\u7d22\u9806\u4f4d\u306e\u5411\u4e0a\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q5. \u30d0\u30ca\u30fc\u8868\u793a\u3092\u6700\u9069\u5316\u3059\u308b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5bfe\u7b56\u306f\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> \u5404\u30c7\u30d0\u30a4\u30b9\u7528\u306b\u753b\u50cf\u3092\u5727\u7e2e\u3057\u3066\u4e0d\u8981\u306a\u30c7\u30fc\u30bf\u3092\u524a\u6e1b\u3059\u308b\u3053\u3068\u3001\u753b\u9762\u5916\u306e\u753b\u50cf\u306b\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3092\u4f7f\u3063\u3066\u521d\u671f\u8aad\u307f\u8fbc\u307f\u6642\u9593\u3092\u77ed\u7e2e\u3059\u308b\u3053\u3068\u3001WebP\u306a\u3069\u306e\u6b21\u4e16\u4ee3\u753b\u50cf\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3092\u4f7f\u3063\u3066\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3092\u524a\u6e1b\u3059\u308b\u3053\u3068\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002\u3053\u308c\u3089\u3067\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u304c\u4e0a\u304c\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n\n<!-- addon:newlink-ar-v1 -->\n<p class=\"wp-block-paragraph\">\u3042\u308f\u305b\u3066\u8aad\u307f\u305f\u3044\uff1a<a href=\"https:\/\/withcode.tech\/media\/css-aspect-ratio\/\">CSS aspect-ratio\u306e\u4f7f\u3044\u65b9\uff5c\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u3092\u4fdd\u3064\u65b9\u6cd5<\/a><\/p>\n\n\n<h2 class=\"wp-block-heading\">AI\u30b9\u30ad\u30eb\u3067\u3001\u672a\u6765\u306e\u81ea\u5206\u3092\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\uff01<\/h2>\n\n<figure class=\"wp-block-image aligncenter size-large\"><a href=\"https:\/\/s.lmes.jp\/landing-qr\/2010578884-C5To3Fmv?uLand=phzKXf\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" width=\"1254\" height=\"1254\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/withai-cta-banner.jpg\" alt=\"\u4eca\u306a\u3089\u5b8c\u5168\u7121\u6599\u3067AI\u3092\u5b66\u3079\u308b\uff01WithAI\" class=\"wp-image-18841\" style=\"max-width:600px;width:100%;height:auto\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/withai-cta-banner.jpg 1254w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/withai-cta-banner-768x768.jpg 768w\" sizes=\"(max-width: 1254px) 100vw, 1254px\" \/><\/a><\/figure>\n\n<h3 class=\"wp-block-heading\">\u4eca\u306a\u3089\u5b8c\u5168\u7121\u6599\u3067AI\u3092\u5b66\u3079\u308b\uff01<\/h3>\n\n<ul class=\"wp-block-list\">\n<li><strong>\u52d5\u753b\u3084\u5b9f\u8df5\u3067\u697d\u3057\u304f\u5b66\u3079\u308b<\/strong>\uff1a\u521d\u5fc3\u8005\u3067\u3082\u5b89\u5fc3\u306e\u30ab\u30ea\u30ad\u30e5\u30e9\u30e0<\/li>\n<li><strong>\u30b9\u30de\u30db\u30fbPC\u3069\u3061\u3089\u3067\u3082OK<\/strong>\uff1a\u597d\u304d\u306a\u6642\u9593\u306b\u5b66\u7fd2\u3067\u304d\u308b<\/li>\n<li><strong>\u6599\u91d1\u306f\u4e00\u5207\u30ca\u30b7<\/strong>\uff1a<span class=\"swl-marker mark_yellow\">0\u5186\u3067AI\u30b9\u30ad\u30eb\u304c\u8eab\u306b\u3064\u304f<\/span><\/li>\n<\/ul>\n\n<p>\u76ee\u7684\u306b\u5408\u308f\u305b\u3066\u9078\u3079\u308b\u300cAI\u526f\u696d\u300d\u300cAI\u8ee2\u8077\u300d\u300cAI\u6d3b\u7528\u300d\u306e3\u30b3\u30fc\u30b9\u3092\u7528\u610f\u3002\u526f\u53ce\u5165\u30fb\u30ad\u30e3\u30ea\u30a2\u30c1\u30a7\u30f3\u30b8\u30fb\u65e5\u5e38\u306e\u751f\u7523\u6027\u30a2\u30c3\u30d7\u307e\u3067\u3001\u3042\u306a\u305f\u306e\u30b4\u30fc\u30eb\u306b\u5408\u308f\u305b\u3066AI\u3092\u5b66\u3079\u307e\u3059\u3002<\/p>\n\n<p>\u4f1a\u54e1\u767b\u9332\u306f\u30ab\u30f3\u30bf\u30f330\u79d2\u3067\u5b8c\u4e86\u3057\u307e\u3059\u3002\u307e\u305a\u306f\u516c\u5f0fLINE\u304b\u3089\u3001\u7121\u6599\u3067AI\u5b66\u7fd2\u3092\u30b9\u30bf\u30fc\u30c8\u3057\u307e\u3057\u3087\u3046\uff01<\/p>\n\n<div class=\"wp-block-buttons\"><div class=\"wp-block-button\"><a class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/s.lmes.jp\/landing-qr\/2010578884-C5To3Fmv?uLand=phzKXf\" target=\"_blank\" rel=\"noopener noreferrer\" style=\"background-color:#06c755\"><strong>\u516c\u5f0fLINE\u304b\u3089\u5b66\u7fd2\u3092\u30b9\u30bf\u30fc\u30c8<\/strong><\/a><\/div><\/div>\n\n\n<!-- withmedia-faq-schema -->\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"CSS\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067\u30d0\u30ca\u30fc\u3092\u5207\u308a\u66ff\u3048\u308b\u65b9\u6cd5\u306f\uff1f\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": 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