{"id":9800,"date":"2025-05-22T22:29:01","date_gmt":"2025-05-22T22:29:01","guid":{"rendered":"https:\/\/withcode.tech\/media\/?p=9800"},"modified":"2026-07-21T11:37:38","modified_gmt":"2026-07-21T11:37:38","slug":"webdesign-fontsize-optimization-description","status":"publish","type":"post","link":"https:\/\/withcode.tech\/media\/webdesign-fontsize-optimization-description\/","title":{"rendered":"\u30102026\u5e74\u6700\u65b0\u3011Web\u30c7\u30b6\u30a4\u30f3\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u5b8c\u5168\u30ac\u30a4\u30c9\uff5cPC\u30fb\u30b9\u30de\u30db\u5225\u306e\u6700\u9069\u306a\u6570\u5024\u3068\u8a2d\u5b9a\u65b9\u6cd5"},"content":{"rendered":"<h2 class=\"wp-block-heading\">\u898b\u51fa\u3057\uff08h1\u301ch6\uff09\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u76ee\u5b89\u3010\u65e9\u898b\u8868\u3011<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u6587\u3060\u3051\u3067\u306a\u304f\u3001\u898b\u51fa\u3057\u306e\u30b5\u30a4\u30ba\u8a2d\u8a08\u3082\u53ef\u8aad\u6027\u3092\u5927\u304d\u304f\u5de6\u53f3\u3057\u307e\u3059\u3002PC\u30fb\u30b9\u30de\u30db\u5225\u306e\u304a\u304a\u307e\u304b\u306a\u76ee\u5b89\u3092\u65e9\u898b\u8868\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002\u6570\u5024\u306f\u7d76\u5bfe\u7684\u306a\u6b63\u89e3\u3067\u306f\u306a\u304f\u3001\u672c\u658716px\u3092\u57fa\u6e96\u306b\u30b8\u30e3\u30f3\u30d7\u7387\uff08\u898b\u51fa\u3057\u3068\u672c\u6587\u306e\u30b5\u30a4\u30ba\u5dee\uff09\u3067\u5f37\u5f31\u3092\u3064\u3051\u308b\u306e\u304c\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u8981\u7d20<\/th><th>PC\uff08px\uff09<\/th><th>\u30b9\u30de\u30db\uff08px\uff09<\/th><th>\u7528\u9014<\/th><\/tr><\/thead><tbody><tr><td>h1<\/td><td>32\u301c40<\/td><td>26\u301c32<\/td><td>\u30da\u30fc\u30b8\u30bf\u30a4\u30c8\u30eb\uff081\u30da\u30fc\u30b81\u3064\uff09<\/td><\/tr><tr><td>h2<\/td><td>26\u301c30<\/td><td>22\u301c26<\/td><td>\u5927\u898b\u51fa\u3057<\/td><\/tr><tr><td>h3<\/td><td>20\u301c24<\/td><td>18\u301c20<\/td><td>\u4e2d\u898b\u51fa\u3057<\/td><\/tr><tr><td>h4<\/td><td>18\u301c20<\/td><td>16\u301c18<\/td><td>\u5c0f\u898b\u51fa\u3057<\/td><\/tr><tr><td>\u672c\u6587<\/td><td>16\u301c18<\/td><td>16<\/td><td>\u6bb5\u843d\u30c6\u30ad\u30b9\u30c8<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">rem\u3067\u7d44\u3080\u3068\u3001\u30eb\u30fc\u30c8\uff08<code>html<\/code>\uff09\u306e16px\u3092\u57fa\u6e96\u306b\u5168\u4f53\u3092\u4e00\u62ec\u8abf\u6574\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u4e0a\u8868\u3092rem\u306b\u7f6e\u304d\u63db\u3048\u305f\u5b9f\u88c5\u4f8b\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>html { font-size: 16px; }\nbody { font-size: 1rem; }    \/* 16px *\/\nh1 { font-size: 2.25rem; }   \/* 36px *\/\nh2 { font-size: 1.75rem; }   \/* 28px *\/\nh3 { font-size: 1.375rem; }  \/* 22px *\/\nh4 { font-size: 1.125rem; }  \/* 18px *\/\n\n@media (max-width: 768px) {\n  h1 { font-size: 1.75rem; } \/* 28px *\/\n  h2 { font-size: 1.5rem; }  \/* 24px *\/\n  h3 { font-size: 1.25rem; } \/* 20px *\/\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u6587\u306f<strong>16px<\/strong>\u3092\u57fa\u6e96\u306b\u3059\u308b\u306e\u304c\u9244\u5247\u3067\u3059\u3002\u30b9\u30de\u30db\u306716px\u3092\u4e0b\u56de\u308b\u3068iOS Safari\u306e\u81ea\u52d5\u30ba\u30fc\u30e0\u304c\u50cd\u3044\u305f\u308a\u3001\u53ef\u8aad\u6027\u304c\u843d\u3061\u305f\u308a\u3059\u308b\u305f\u3081\u3001\u898b\u51fa\u3057\u306f16px\u3088\u308a\u5927\u304d\u304f\u3001\u672c\u6587\u306f16px\u4ee5\u4e0a\u3092\u5b88\u308b\u3068\u5931\u6557\u3057\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n\n<!-- withmedia-ketsuron -->\n<h2 class=\"wp-block-heading\">\u3053\u306e\u8a18\u4e8b\u306e\u7d50\u8ad6<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Web\u30c7\u30b6\u30a4\u30f3\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f\u3001\u53ef\u8aad\u6027\u3084UX\u3060\u3051\u3067\u306a\u304fSEO\u8a55\u4fa1\u3084\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306b\u3082\u5f71\u97ff\u3059\u308b\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002PC\u306e\u672c\u6587\u306f16\u301c18px\u3001\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u306e\u672c\u6587\u306f\u6700\u4f4e14px\u30fb\u63a8\u596816px\u304c\u57fa\u6e96\u3067\u300112px\u672a\u6e80\u306fGoogle\u306e\u30e2\u30d0\u30a4\u30eb\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u30c6\u30b9\u30c8\u3067\u300c\u5c0f\u3055\u3059\u304e\u308b\u30c6\u30ad\u30b9\u30c8\u300d\u3068\u3057\u3066\u8b66\u544a\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u5358\u4f4d\u306f\u30c7\u30b6\u30a4\u30f3\u306e\u518d\u73fe\u6027\u304c\u9ad8\u3044px\u3001\u30eb\u30fc\u30c8\u8981\u7d20\u3092\u57fa\u6e96\u306b\u30b5\u30a4\u30c8\u5168\u4f53\u3092\u4e00\u62ec\u8abf\u6574\u3067\u304d\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306b\u512a\u308c\u308brem\u3001\u8981\u7d20\u57fa\u6e96\u306eem\u304c\u3042\u308a\u3001\u305d\u308c\u305e\u308c\u306e\u7279\u6027\u3092\u7406\u89e3\u3057\u3066\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002<\/p>\n\n\n<div class=\"swell-block-balloon\">\n<div class=\"c-balloon -bln-left\" data-col=\"gray\">\n<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=\"\u751f\u5f92\u306e\u30a2\u30a4\u30b3\u30f3\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div>\n<div class=\"c-balloon__body -speaking -border-none\">\n<div class=\"c-balloon__text\">\n<p><strong>\u30da\u30f3\u535a\u58eb\u3001Web\u30c7\u30b6\u30a4\u30f3\u3067\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3092\u6c7a\u3081\u308b\u306e\u3063\u3066\u96e3\u3057\u3044\u3067\u3059\u2026\u3002\u5927\u304d\u3059\u304e\u308b\u3068\u8aad\u307f\u306b\u304f\u3044\u3057\u3001\u5c0f\u3055\u3059\u304e\u308b\u3068\u898b\u3048\u306a\u3044\u3057\u2026\u3002\u3069\u3046\u3084\u3063\u3066\u6700\u9069\u306a\u6570\u5024\u3092\u6c7a\u3081\u308c\u3070\u3044\u3044\u3093\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<div class=\"swell-block-balloon\">\n<div class=\"c-balloon -bln-right\" data-col=\"gray\">\n<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=\"\u30da\u30f3\u535a\u58eb\u306e\u30a2\u30a4\u30b3\u30f3\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div>\n<div class=\"c-balloon__body -speaking -border-none\">\n<div class=\"c-balloon__text\">\n<p><strong>\u3088\u3044\u8cea\u554f\u3058\u3083\u306a\u3002\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f<strong>\u53ef\u8aad\u6027\u3068\u30c7\u30b6\u30a4\u30f3\u6027\u306e\u4e21\u7acb<\/strong>\u304c\u9375\u3058\u3083\u3002\u3057\u304b\u3082\u3001PC\u3068\u30b9\u30de\u30db\u3067\u898b\u3048\u65b9\u304c\u5168\u7136\u9055\u3046\u304b\u3089\u3001\u305f\u3060px\u3092\u6307\u5b9a\u3059\u308b\u3060\u3051\u3067\u306f\u4e0d\u5341\u5206\u306a\u3093\u3058\u3083\u3002\u4eca\u65e5\u306f\u5177\u4f53\u7684\u306a\u6570\u5024\u304b\u3089\u8a2d\u5b9a\u624b\u9806\u307e\u3067\u3001\u5fb9\u5e95\u7684\u306b\u89e3\u8aac\u3059\u308b\u304b\u3089\u3088\u30fc\u304f\u805e\u304f\u306e\u3058\u3083\u305e\u3002<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<div class=\"swell-block-balloon\">\n<div class=\"c-balloon -bln-left\" data-col=\"gray\">\n<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=\"\u751f\u5f92\u306e\u30a2\u30a4\u30b3\u30f3\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div>\n<div class=\"c-balloon__body -speaking -border-none\">\n<div class=\"c-balloon__text\">\n<p><strong>\u3042\u308a\u304c\u3068\u3046\u3054\u3056\u3044\u307e\u3059\uff01\u305c\u3072\u304a\u9858\u3044\u3057\u307e\u3059\uff01<\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">\u300cWeb\u30b5\u30a4\u30c8\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f\u4f55px\u304c\u6b63\u89e3\u306a\u306e\uff1f\u300d<\/span><\/strong><br>\n<strong><span class=\"swl-marker mark_yellow\">\u300c\u30b9\u30de\u30db\u3068PC\u3067\u898b\u3048\u65b9\u304c\u9055\u3046\u3051\u3069\u3001\u3069\u3046\u8abf\u6574\u3059\u308c\u3070\u3044\u3044\u306e\uff1f\u300d<\/span><\/strong><br>\n<strong><span class=\"swl-marker mark_yellow\">\u300crem\u3068px\u3001\u7d50\u5c40\u3069\u3061\u3089\u3092\u4f7f\u3048\u3070\u3044\u3044\u306e\uff1f\u300d<\/span><\/strong><br>\n\u305d\u3093\u306a\u7591\u554f\u3092\u62b1\u3048\u3066\u3044\u308bWeb\u30c7\u30b6\u30a4\u30f3\u521d\u5fc3\u8005\u306e\u65b9\u3082\u591a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n<p class=\"wp-block-paragraph\">\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306e\u8a2d\u5b9a\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u300c\u8aad\u307f\u3084\u3059\u3055\u300d\u306b\u76f4\u7d50\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001SEO\u8a55\u4fa1\u3084\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u7387\u306b\u3082\u5f71\u97ff\u3059\u308b\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u9069\u5207\u306a\u30b5\u30a4\u30ba\u3092\u8a2d\u5b9a\u3067\u304d\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3067\u3001\u30b5\u30a4\u30c8\u306e\u5370\u8c61\u3068\u6210\u679c\u306f\u5927\u304d\u304f\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n\n<p class=\"wp-block-paragraph\">\u672c\u8a18\u4e8b\u3092\u8aad\u3080\u3053\u3068\u3067\u3001\u4ee5\u4e0b\u306e\u60c5\u5831\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n\n<ul class=\"wp-block-list\">\n  <li><strong>PC\u30fb\u30b9\u30de\u30db\u5225\u306e\u6700\u9069\u306a\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3068\u5177\u4f53\u7684\u306a\u6570\u5024\u306e\u6839\u62e0<\/strong><\/li>\n  <li><strong>px\u30fbrem\u30fbem\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051\u306e\u5224\u65ad\u57fa\u6e96<\/strong><\/li>\n  <li><strong>\u30c7\u30d0\u30a4\u30b9\u3084\u30bf\u30fc\u30b2\u30c3\u30c8\u30e6\u30fc\u30b6\u30fc\u306b\u5fdc\u3058\u305f\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u8abf\u6574\u65b9\u6cd5<\/strong><\/li>\n  <li><strong>\u30c7\u30b6\u30a4\u30f3\u6027\u3068\u53ef\u8aad\u6027\u3092\u4e21\u7acb\u3055\u305b\u308b\u30bf\u30a4\u30dd\u30b0\u30e9\u30d5\u30a3\u8a2d\u8a08\u30c6\u30af\u30cb\u30c3\u30af<\/strong><\/li>\n  <li><strong>\u5b9f\u969b\u306eCSS\u30b3\u30fc\u30c9\u3067\u5b66\u3076\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u306e\u624b\u9806<\/strong><\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">\u30e6\u30fc\u30b6\u30fc\u306b\u4f1d\u308f\u308b\u6587\u5b57\u8a2d\u8a08\u3092\u8eab\u306b\u3064\u3051\u3001\u30c7\u30b6\u30a4\u30f3\u306e\u8cea\u3068\u6210\u679c\u3092\u9ad8\u3081\u307e\u3057\u3087\u3046\u3002<\/p>\n\n<p class=\"is-style-icon_announce wp-block-paragraph\">\u300c\u5b66\u7fd2\u2192\u5c31\u8077\u300d\u306b\u3064\u306a\u3052\u305f\u53d7\u8b1b\u751f\u306e\u30ea\u30a2\u30eb\u306a\u4f53\u9a13\u8ac7\u3082\u516c\u958b\u4e2d\uff01<br>\u50cd\u304d\u65b9\u3092\u5909\u3048\u305f\u3044\u65b9\u306b\u3082\u97ff\u304f\u30b9\u30c8\u30fc\u30ea\u30fc\u3067\u3059\u3002<\/p>\n\n<p class=\"is-style-icon_info wp-block-paragraph\"><strong>\u5409\u6c60\u3055\u3093\u306e\u4f53\u9a13\u8ac7<\/strong><br>\nWeb\u5236\u4f5c\u3092\u4f53\u7cfb\u7684\u306b\u5b66\u3073\u305f\u3044\u3068\u8003\u3048\u3001WithCode\u306b\u5165\u4f1a\u3055\u308c\u307e\u3057\u305f\u3002\u5352\u696d\u5f8c\u306f\u3001WithCode\u7d4c\u7531\u3067\u5b9f\u6848\u4ef6\u3092\u7d4c\u9a13\u3057\u305f\u307b\u304b\u3001\u3054\u81ea\u8eab\u3067\u3082\u6848\u4ef6\u3092\u7372\u5f97\u3002\u4eca\u5f8c\u306fWeb\u7cfb\u306e\u696d\u52d9\u306b\u643a\u308f\u308a\u305f\u3044\u3068\u3044\u3046\u601d\u3044\u304b\u3089\u8ee2\u8077\u6d3b\u52d5\u3092\u884c\u3044\u3001\u53d7\u8a17\u958b\u767a\u306e\u4f1a\u793e\u3078\u306e\u8ee2\u8077\u3092\u6210\u529f\u3055\u305b\u307e\u3057\u305f\u3002<\/p>\n\n<h2>Web\u30c7\u30b6\u30a4\u30f3\u3067\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u304c\u91cd\u8981\u306a\u7406\u7531<\/h2>\n\n<p>Web\u30b5\u30a4\u30c8\u306b\u304a\u3051\u308b\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f\u3001\u5358\u306a\u308b\u300c\u898b\u305f\u76ee\u306e\u597d\u307f\u300d\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30e6\u30fc\u30b6\u30fc\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\uff08UX\uff09\u30fb\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30fbSEO\u306e3\u3064\u306e\u89b3\u70b9\u304b\u3089\u3001\u30b5\u30a4\u30c8\u306e\u6210\u5426\u3092\u5927\u304d\u304f\u5de6\u53f3\u3059\u308b\u8981\u7d20\u3067\u3059\u3002<\/p>\n\n<h3>\u53ef\u8aad\u6027\u3068UX\u3078\u306e\u5f71\u97ff<\/h3>\n\n<p>\u6587\u5b57\u304c\u5c0f\u3055\u3059\u304e\u308b\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u8aad\u3080\u306e\u3092\u8ae6\u3081\u3066\u30da\u30fc\u30b8\u3092\u96e2\u8131\u3057\u307e\u3059\u3002Google\u306e\u30e6\u30fc\u30b6\u30d3\u30ea\u30c6\u30a3\u8abf\u67fb\u306b\u3088\u308b\u3068\u3001\u30e2\u30d0\u30a4\u30eb\u30da\u30fc\u30b8\u3067\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u304c\u5c0f\u3055\u3059\u304e\u308b\u5834\u5408\u3001\u76f4\u5e30\u7387\u304c\u5927\u5e45\u306b\u4e0a\u6607\u3059\u308b\u3053\u3068\u304c\u5831\u544a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u9006\u306b\u5927\u304d\u3059\u304e\u308b\u30681\u884c\u306b\u8868\u793a\u3055\u308c\u308b\u6587\u5b57\u6570\u304c\u6e1b\u308a\u3001\u8aad\u307f\u9032\u3081\u308b\u30ea\u30ba\u30e0\u304c\u5d29\u308c\u307e\u3059\u3002<\/p>\n\n<h3>SEO\u8a55\u4fa1\u3078\u306e\u5f71\u97ff<\/h3>\n\n<p>Google\u306f\u300cCore Web Vitals\u300d\u3084\u30e2\u30d0\u30a4\u30eb\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u8a55\u4fa1\u306e\u4e2d\u3067\u3001\u30c6\u30ad\u30b9\u30c8\u306e\u53ef\u8aad\u6027\u3092\u30e9\u30f3\u30ad\u30f3\u30b0\u8981\u56e0\u3068\u3057\u3066\u8003\u616e\u3057\u3066\u3044\u307e\u3059\u3002\u7279\u306b<strong>\u30e2\u30d0\u30a4\u30eb\u7aef\u672b\u3067\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u304c12px\u672a\u6e80\u306e\u5834\u5408\u3001Google Search Console\u3067\u300c\u5c0f\u3055\u3059\u304e\u308b\u30c6\u30ad\u30b9\u30c8\u300d\u3068\u3057\u3066\u8b66\u544a\u304c\u8868\u793a\u3055\u308c\u308b<\/strong>\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u9069\u5207\u306a\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306fSEO\u6539\u5584\u306b\u3082\u76f4\u7d50\u3059\u308b\u306e\u3067\u3059\u3002<\/p>\n\n<h3>\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u3078\u306e\u914d\u616e<\/h3>\n\n<p>Web Content Accessibility Guidelines\uff08WCAG\uff092.1\u3067\u306f\u3001\u8996\u899a\u7684\u306b\u8aad\u307f\u3084\u3059\u3044\u30c6\u30ad\u30b9\u30c8\u306e\u63d0\u4f9b\u304c\u63a8\u5968\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u9ad8\u9f62\u8005\u3084\u8996\u899a\u969c\u304c\u3044\u3092\u6301\u3064\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u3082\u8aad\u307f\u3084\u3059\u3044\u30b5\u30a4\u30c8\u8a2d\u8a08\u306f\u3001\u3088\u308a\u591a\u304f\u306e\u4eba\u306b\u5c4a\u304f\u30b3\u30f3\u30c6\u30f3\u30c4\u4f5c\u308a\u306e\u57fa\u672c\u3067\u3059\u3002<\/p>\n\n<h2>Web\u30c7\u30b6\u30a4\u30f3\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\uff5cPC\u30fb\u30b9\u30de\u30db\u5225\u306e\u6700\u9069\u306a\u6570\u5024<\/h2>\n<!-- withmedia-diagram -->\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/9800-9800_2_sizes.png\" alt=\"PC\u30fb\u30b9\u30de\u30db\u5225\u306e\u63a8\u5968\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u65e9\u898b\u8868\u306e\u56f3\u89e3\" class=\"wp-image-16727\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/9800-9800_2_sizes.png 1200w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/9800-9800_2_sizes-768x432.png 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n<p>\u300c\u7d50\u5c40\u3001\u4f55px\u306b\u3059\u308c\u3070\u3044\u3044\u306e\uff1f\u300d\u3068\u3044\u3046\u7591\u554f\u306b\u5bfe\u3057\u3066\u3001\u30c7\u30d0\u30a4\u30b9\u5225\u30fb\u8981\u7d20\u5225\u306b\u5177\u4f53\u7684\u306a\u63a8\u5968\u6570\u5024\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n<h3>PC\u30b5\u30a4\u30c8\uff08\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\uff09\u306e\u63a8\u5968\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba<\/h3>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30c6\u30ad\u30b9\u30c8\u8981\u7d20<\/th>\n      <th>\u63a8\u5968\u30b5\u30a4\u30ba<\/th>\n      <th>\u5099\u8003<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u672c\u6587\uff08body text\uff09<\/td>\n      <td>16px\u301c18px<\/td>\n      <td>\u6700\u3082\u8aad\u307e\u308c\u308b\u8981\u7d20\u300216px\u304c\u696d\u754c\u6a19\u6e96<\/td>\n    <\/tr>\n    <tr>\n      <td>h1\uff08\u30da\u30fc\u30b8\u30bf\u30a4\u30c8\u30eb\uff09<\/td>\n      <td>32px\u301c48px<\/td>\n      <td>\u30da\u30fc\u30b8\u306e\u4e3b\u984c\u3092\u660e\u78ba\u306b\u793a\u3059<\/td>\n    <\/tr>\n    <tr>\n      <td>h2\uff08\u5927\u898b\u51fa\u3057\uff09<\/td>\n      <td>24px\u301c32px<\/td>\n      <td>\u30bb\u30af\u30b7\u30e7\u30f3\u533a\u5206\u3092\u660e\u78ba\u306b<\/td>\n    <\/tr>\n    <tr>\n      <td>h3\uff08\u4e2d\u898b\u51fa\u3057\uff09<\/td>\n      <td>18px\u301c24px<\/td>\n      <td>\u672c\u6587\u3068\u306e\u5dee\u3092\u610f\u8b58\u3059\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30ad\u30e3\u30d7\u30b7\u30e7\u30f3\u30fb\u6ce8\u91c8<\/td>\n      <td>12px\u301c14px<\/td>\n      <td>\u88dc\u8db3\u60c5\u5831\u306e\u307f\u4f7f\u7528<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3<\/td>\n      <td>14px\u301c16px<\/td>\n      <td>\u30af\u30ea\u30c3\u30af\u3057\u3084\u3059\u3055\u3082\u8003\u616e<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<p class=\"is-style-icon_point wp-block-paragraph\"><strong>\u30dd\u30a4\u30f3\u30c8\uff1a<\/strong>PC\u306e\u672c\u6587\u306f<strong>16px\u4ee5\u4e0a<\/strong>\u304c\u57fa\u672c\u3067\u3059\u3002\u304b\u3064\u3066\u306f14px\u304c\u4e3b\u6d41\u3067\u3057\u305f\u304c\u3001\u9ad8\u89e3\u50cf\u5ea6\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\uff08Retina\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\u306a\u3069\uff09\u306e\u666e\u53ca\u306b\u3088\u308a\u3001\u73fe\u5728\u306f16px\u301c18px\u304c\u6a19\u6e96\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n<h3>\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\uff08\u30e2\u30d0\u30a4\u30eb\uff09\u306e\u63a8\u5968\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba<\/h3>\n\n<table>\n  <thead>\n    <tr>\n      <th>\u30c6\u30ad\u30b9\u30c8\u8981\u7d20<\/th>\n      <th>\u63a8\u5968\u30b5\u30a4\u30ba<\/th>\n      <th>\u5099\u8003<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u672c\u6587\uff08body text\uff09<\/td>\n      <td>14px\u301c16px<\/td>\n      <td>\u6700\u4f4e14px\u3002Google\u306f16px\u63a8\u5968<\/td>\n    <\/tr>\n    <tr>\n      <td>h1\uff08\u30da\u30fc\u30b8\u30bf\u30a4\u30c8\u30eb\uff09<\/td>\n      <td>24px\u301c32px<\/td>\n      <td>PC\u3088\u308a\u5c0f\u3055\u304f\u3057\u3066\u30d0\u30e9\u30f3\u30b9\u3092\u53d6\u308b<\/td>\n    <\/tr>\n    <tr>\n      <td>h2\uff08\u5927\u898b\u51fa\u3057\uff09<\/td>\n      <td>20px\u301c24px<\/td>\n      <td>\u672c\u6587\u3068\u306e\u5dee\u3092\u4fdd\u3064<\/td>\n    <\/tr>\n    <tr>\n      <td>h3\uff08\u4e2d\u898b\u51fa\u3057\uff09<\/td>\n      <td>16px\u301c20px<\/td>\n      <td>\u672c\u6587\u3068\u5dee\u3092\u3064\u3051\u308b\u3053\u3068\u304c\u91cd\u8981<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30ad\u30e3\u30d7\u30b7\u30e7\u30f3\u30fb\u6ce8\u91c8<\/td>\n      <td>11px\u301c13px<\/td>\n      <td>12px\u672a\u6e80\u306fGoogle\u8b66\u544a\u5bfe\u8c61\u306b\u306a\u308b\u3053\u3068\u3082<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30dc\u30bf\u30f3\u30c6\u30ad\u30b9\u30c8<\/td>\n      <td>14px\u301c16px<\/td>\n      <td>\u30bf\u30c3\u30d7\u9818\u57df\u306f44px\u4ee5\u4e0a\u3092\u78ba\u4fdd<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<p class=\"is-style-icon_caution wp-block-paragraph\"><strong>\u6ce8\u610f\uff1a<\/strong>\u30b9\u30de\u30db\u3067\u306e\u672c\u6587\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f<strong>\u6700\u4f4e14px\u3001\u63a8\u596816px<\/strong>\u3067\u3059\u300212px\u672a\u6e80\u306fGoogle\u306e\u30e2\u30d0\u30a4\u30eb\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u30c6\u30b9\u30c8\u3067\u300c\u5c0f\u3055\u3059\u304e\u308b\u30c6\u30ad\u30b9\u30c8\u300d\u3068\u3057\u3066\u691c\u51fa\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n<h2>\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306e\u5358\u4f4d\uff5cpx\u30fbrem\u30fbem\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051<\/h2>\n<!-- withmedia-diagram -->\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1200\" height=\"675\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/9800-9800_1_units.png\" alt=\"px\u30fbrem\u30fbem\u306e3\u3064\u306e\u5358\u4f4d\u306e\u57fa\u6e96\u306e\u9055\u3044\u3092\u793a\u3057\u305f\u56f3\u89e3\" class=\"wp-image-16728\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/9800-9800_1_units.png 1200w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/9800-9800_1_units-768x432.png 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n\n\n<p>\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3059\u308b\u5358\u4f4d\u306b\u306f\u4e3b\u306b\u300cpx\u300d\u300crem\u300d\u300cem\u300d\u306e3\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u7279\u6027\u3092\u7406\u89e3\u3057\u3066\u9069\u5207\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u304c\u3001\u30d7\u30ed\u306eWeb\u30c7\u30b6\u30a4\u30ca\u30fc\u3078\u306e\u7b2c\u4e00\u6b69\u3067\u3059\u3002<\/p>\n\n<h3>px\uff08\u30d4\u30af\u30bb\u30eb\uff09<\/h3>\n\n<p><strong>\u7279\u5fb4\uff1a<\/strong>\u753b\u9762\u4e0a\u306e\u7d76\u5bfe\u7684\u306a\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u30d6\u30e9\u30a6\u30b6\u306e\u57fa\u672c\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u8a2d\u5b9a\u306b\u5f71\u97ff\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n\n<p><strong>\u30e1\u30ea\u30c3\u30c8\uff1a<\/strong>\u6307\u5b9a\u3057\u305f\u901a\u308a\u306e\u30b5\u30a4\u30ba\u3067\u8868\u793a\u3055\u308c\u308b\u305f\u3081\u3001\u30c7\u30b6\u30a4\u30f3\u306e\u518d\u73fe\u6027\u304c\u9ad8\u3044\u3002<\/p>\n\n<p><strong>\u30c7\u30e1\u30ea\u30c3\u30c8\uff1a<\/strong>\u30e6\u30fc\u30b6\u30fc\u304c\u30d6\u30e9\u30a6\u30b6\u306e\u6587\u5b57\u30b5\u30a4\u30ba\u3092\u5909\u66f4\u3057\u3066\u3082\u53cd\u6620\u3055\u308c\u306a\u3044\u305f\u3081\u3001\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306e\u89b3\u70b9\u3067\u306f\u52a3\u308b\u5834\u5408\u304c\u3042\u308b\u3002<\/p>\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* px\u306e\u4f7f\u7528\u4f8b *\/\nbody {\n  font-size: 16px;\n}\nh1 {\n  font-size: 32px;\n}\n<\/code><\/pre><\/div>\n\n<h3>rem\uff08\u30eb\u30fc\u30c8em\uff09<\/h3>\n\n<p><strong>\u7279\u5fb4\uff1a<\/strong>HTML\u306e\u30eb\u30fc\u30c8\u8981\u7d20\uff08&lt;html&gt;\uff09\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3092\u57fa\u6e96\u3068\u3059\u308b\u76f8\u5bfe\u5358\u4f4d\u3067\u3059\u3002\u30d6\u30e9\u30a6\u30b6\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306f16px\u3002<\/p>\n\n<p><strong>\u30e1\u30ea\u30c3\u30c8\uff1a<\/strong>\u30eb\u30fc\u30c8\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3092\u5909\u66f4\u3059\u308b\u3060\u3051\u3067\u3001\u30b5\u30a4\u30c8\u5168\u4f53\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3092\u4e00\u62ec\u8abf\u6574\u3067\u304d\u308b\u3002\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306b\u3082\u512a\u308c\u308b\u3002<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>\u30c7\u30e1\u30ea\u30c3\u30c8\uff1a<\/strong>\u6307\u5b9a\u30b5\u30a4\u30ba\u3092\u8a08\u7b97\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\uff08\u4f8b\uff1a24px \uff1d 1.5rem\uff09\u3002\u305f\u3060\u3057\u3001\u30eb\u30fc\u30c8\u8981\u7d20\u306b <code>font-size: 62.5%<\/code> \u3092\u6307\u5b9a\u3059\u308b\u30681rem\uff1d10px\u3068\u306a\u308a\u3001<code>1.6rem\uff1d16px<\/code> \u306e\u3088\u3046\u306b\u76f4\u611f\u7684\u306b\u6271\u3048\u307e\u3059\u3002<\/p>\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* rem \u306e\u4f7f\u7528\u4f8b\uff0862.5%\u30c8\u30ea\u30c3\u30af\u3067\u8a08\u7b97\u3092\u30e9\u30af\u306b\u3059\u308b\uff09 *\/\nhtml {\n  font-size: 62.5%;   \/* 16px \u00d7 62.5% = 10px \u3092\u57fa\u6e96\u306b *\/\n}\nbody {\n  font-size: 1.6rem;  \/* = 16px *\/\n}\nh1 {\n  font-size: 3.2rem;  \/* = 32px *\/\n}<\/code><\/pre><\/div>\n\n<h3 class=\"wp-block-heading\">em\uff08\u8981\u7d20\u57fa\u6e96\u306e\u76f8\u5bfe\u5358\u4f4d\uff09<\/h3>\n\n<p class=\"wp-block-paragraph\"><strong>\u7279\u5fb4\uff1a<\/strong>\u305d\u306e\u8981\u7d20\u81ea\u8eab\u3001\u307e\u305f\u306f\u89aa\u8981\u7d20\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3092\u57fa\u6e96\u3068\u3059\u308b\u76f8\u5bfe\u5358\u4f4d\u3067\u3059\u3002<code>1em<\/code> \u306f\u57fa\u6e96\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3068\u540c\u3058\u5927\u304d\u3055\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>\u30e1\u30ea\u30c3\u30c8\uff1a<\/strong>\u89aa\u8981\u7d20\u306b\u5bfe\u3057\u3066\u76f8\u5bfe\u7684\u306b\u62e1\u5927\u30fb\u7e2e\u5c0f\u3067\u304d\u308b\u305f\u3081\u3001\u30dc\u30bf\u30f3\u3084\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5358\u4f4d\u3067\u307e\u3068\u3081\u3066\u30b5\u30a4\u30ba\u8abf\u6574\u3057\u305f\u3044\u3068\u304d\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>\u30c7\u30e1\u30ea\u30c3\u30c8\uff1a<\/strong>\u5165\u308c\u5b50\u306b\u306a\u308b\u3068\u500d\u7387\u304c\u639b\u3051\u5408\u308f\u3055\u3063\u3066<strong><span class=\"swl-marker mark_yellow\">\u300cem\u306e\u8907\u5229\u554f\u984c\u300d<\/span><\/strong>\u304c\u8d77\u3053\u308a\u3001\u610f\u56f3\u305b\u305a\u6587\u5b57\u304c\u5927\u304d\u304f\uff0f\u5c0f\u3055\u304f\u306a\u308a\u304c\u3061\u3067\u3059\u3002<\/p>\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* em \u306f\u89aa\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3092\u57fa\u6e96\u306b\u3059\u308b *\/\n.card {\n  font-size: 16px;\n}\n.card .title {\n  font-size: 1.5em;   \/* 16px \u00d7 1.5 = 24px *\/\n}\n.card .title .badge {\n  font-size: 0.75em;  \/* 24px \u00d7 0.75 = 18px\uff08\u89aa\u306e.title\u304c\u57fa\u6e96\uff09 *\/\n}<\/code><\/pre><\/div>\n\n<h3 class=\"wp-block-heading\">px\u30fbrem\u30fbem \u306e\u9055\u3044\u65e9\u898b\u8868<\/h3>\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>\u5358\u4f4d<\/th><th>\u57fa\u6e96<\/th><th>\u4e00\u62ec\u8abf\u6574<\/th><th>\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3<\/th><th>\u4e3b\u306a\u7528\u9014<\/th><\/tr><\/thead>\n<tbody>\n<tr><td><strong>px<\/strong><\/td><td>\u753b\u9762\u306e\u7d76\u5bfe\u5024<\/td><td>\u00d7<\/td><td>\u25b3<\/td><td>\u67a0\u7dda\u30fb\u7d30\u304b\u306a\u56fa\u5b9a\u8981\u7d20<\/td><\/tr>\n<tr><td><strong>rem<\/strong><\/td><td>\u30eb\u30fc\u30c8(html)<\/td><td>\u25ce<\/td><td>\u25ce<\/td><td>\u672c\u6587\u30fb\u898b\u51fa\u3057\u306a\u3069\u5168\u4f53<\/td><\/tr>\n<tr><td><strong>em<\/strong><\/td><td>\u305d\u306e\u8981\u7d20\/\u89aa<\/td><td>\u25cb<\/td><td>\u25cb<\/td><td>\u30dc\u30bf\u30f3\u7b49\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185<\/td><\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">\u672c\u6587\u3084\u898b\u51fa\u3057\u306e\u57fa\u672c\u30b5\u30a4\u30ba\u306f rem\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u306e\u76f8\u5bfe\u8abf\u6574\u306f em\u3001\u67a0\u7dda\u306a\u3069\u56fa\u5b9a\u3057\u305f\u3044\u7b87\u6240\u306f px<\/span><\/strong>\u2014\u2014\u3053\u306e\u3088\u3046\u306b\u4f7f\u3044\u5206\u3051\u308b\u306e\u304c\u73fe\u4ee3\u7684\u306a\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3067\u3059\u3002<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\">\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\uff5c\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067PC\u30fb\u30b9\u30de\u30db\u3092\u51fa\u3057\u5206\u3051\u308b<\/h2>\n\n<p class=\"wp-block-paragraph\">PC\u3068\u30b9\u30de\u30db\u3067\u6700\u9069\u306a\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f\u7570\u306a\u308a\u307e\u3059\u3002<code>@media<\/code>\uff08\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\uff09\u3067\u753b\u9762\u5e45\u3054\u3068\u306b\u30b5\u30a4\u30ba\u3092\u5207\u308a\u66ff\u3048\u308b\u306e\u304c\u57fa\u672c\u306e\u5b9f\u88c5\u3067\u3059\u3002<\/p>\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30e2\u30d0\u30a4\u30eb\u30d5\u30a1\u30fc\u30b9\u30c8\uff1a\u307e\u305a\u30b9\u30de\u30db\u5411\u3051\u3092\u66f8\u304f *\/\nbody {\n  font-size: 16px;\n  line-height: 1.8;\n}\nh1 { font-size: 24px; }\nh2 { font-size: 20px; }\n\n\/* 768px\u4ee5\u4e0a\uff08\u30bf\u30d6\u30ec\u30c3\u30c8\u30fbPC\uff09\u3067\u5927\u304d\u304f\u3059\u308b *\/\n@media (min-width: 768px) {\n  body { font-size: 18px; }\n  h1   { font-size: 40px; }\n  h2   { font-size: 28px; }\n}<\/code><\/pre><\/div>\n\n<p class=\"wp-block-paragraph\">\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u306f <code>768px<\/code>\uff08\u30bf\u30d6\u30ec\u30c3\u30c8\uff09\u3068 <code>1024px<\/code>\uff08PC\uff09\u3092\u76ee\u5b89\u306b\u8a2d\u5b9a\u3059\u308b\u3068\u30d0\u30e9\u30f3\u30b9\u3088\u304f\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u3002<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\">clamp()\u3067\u4f5c\u308b\u6d41\u4f53\u30bf\u30a4\u30dd\u30b0\u30e9\u30d5\u30a3\uff08fluid typography\uff09<\/h2>\n\n<p class=\"wp-block-paragraph\">\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067\u6bb5\u968e\u7684\u306b\u5207\u308a\u66ff\u3048\u308b\u4ee3\u308f\u308a\u306b\u3001<strong><span class=\"swl-marker mark_yellow\">\u753b\u9762\u5e45\u306b\u5fdc\u3058\u3066\u6587\u5b57\u30b5\u30a4\u30ba\u3092\u306a\u3081\u3089\u304b\u306b\u5909\u5316\u3055\u305b\u308b<\/span><\/strong>\u306e\u304c\u300c\u6d41\u4f53\u30bf\u30a4\u30dd\u30b0\u30e9\u30d5\u30a3\uff08fluid typography\uff09\u300d\u3067\u3059\u3002CSS\u306e <code>clamp()<\/code> \u95a2\u65701\u3064\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* clamp(\u6700\u5c0f\u5024, \u63a8\u5968\u5024, \u6700\u5927\u5024) *\/\nh1 {\n  \/* \u30b9\u30de\u30db\u3067\u306f28px\u3001\u753b\u9762\u304c\u5e83\u304c\u308b\u307b\u3069\u62e1\u5927\u3057\u3001\u6700\u592748px\u3067\u6b62\u307e\u308b *\/\n  font-size: clamp(28px, 5vw, 48px);\n}\nbody {\n  font-size: clamp(16px, 1.2vw + 14px, 18px);\n}<\/code><\/pre><\/div>\n\n<p class=\"wp-block-paragraph\"><code>clamp(MIN, \u63a8\u5968, MAX)<\/code> \u306f\u300c\u63a8\u5968\u5024\u3092\u57fa\u672c\u306b\u3057\u3064\u3064\u3001MIN\u3088\u308a\u5c0f\u3055\u304f\u3082MAX\u3088\u308a\u5927\u304d\u304f\u3082\u3057\u306a\u3044\u300d\u3068\u3044\u3046\u6307\u5b9a\u3067\u3059\u3002<code>vw<\/code>\uff08\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u5e45\uff09\u3092\u6df7\u305c\u308b\u3053\u3068\u3067\u3001\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u3054\u3068\u306e\u8a18\u8ff0\u3092\u6e1b\u3089\u3057\u306a\u304c\u3089\u3001\u3069\u306e\u753b\u9762\u5e45\u3067\u3082\u8aad\u307f\u3084\u3059\u3044\u30b5\u30a4\u30ba\u3092\u4fdd\u3066\u307e\u3059\u3002<\/p>\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">\u6700\u5c0f\u5024\u306f\u5fc5\u305a16px\u524d\u5f8c\u3092\u78ba\u4fdd\u3059\u308b<\/span><\/strong>\u306e\u304c\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002vw\u3060\u3051\u3067\u6307\u5b9a\u3059\u308b\u3068\u3001\u72ed\u3044\u753b\u9762\u3067\u6587\u5b57\u304c\u6975\u7aef\u306b\u5c0f\u3055\u304f\u306a\u308a\u53ef\u8aad\u6027\u30fb\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u3092\u640d\u306a\u3044\u307e\u3059\u3002<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\">\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u3068\u4e00\u7dd2\u306b\u6574\u3048\u308b\u300c\u884c\u9593\u30fb\u5b57\u9593\u30fb\u884c\u9577\u300d<\/h2>\n\n<p class=\"wp-block-paragraph\">\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f\u5358\u4f53\u3067\u6c7a\u3081\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u8aad\u307f\u3084\u3059\u3055\u306f <strong>\u884c\u9593\uff08line-height\uff09\u30fb\u5b57\u9593\uff08letter-spacing\uff09\u30fb1\u884c\u306e\u9577\u3055\uff08\u884c\u9577\uff09<\/strong> \u3068\u306e\u30d0\u30e9\u30f3\u30b9\u3067\u6c7a\u307e\u308a\u307e\u3059\u3002<\/p>\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>\u8981\u7d20<\/th><th>\u63a8\u5968\u5024<\/th><th>\u30dd\u30a4\u30f3\u30c8<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u884c\u9593 line-height<\/td><td>1.5\u301c1.8<\/td><td>\u672c\u6587\u306f1.75\u524d\u5f8c\u304c\u8aad\u307f\u3084\u3059\u3044\u3002\u5358\u4f4d\u306a\u3057\u3067\u6307\u5b9a<\/td><\/tr>\n<tr><td>\u5b57\u9593 letter-spacing<\/td><td>0\u301c0.05em<\/td><td>\u65e5\u672c\u8a9e\u306f\u8a70\u3081\u3059\u304e\u6ce8\u610f\u3002\u898b\u51fa\u3057\u306f\u5c11\u3057\u5e83\u3052\u3066\u3082\u826f\u3044<\/td><\/tr>\n<tr><td>1\u884c\u306e\u9577\u3055\uff08\u884c\u9577\uff09<\/td><td>\u5168\u89d235\u301c45\u5b57<\/td><td>\u9577\u3059\u304e\u308b\u3068\u8996\u7dda\u304c\u623b\u308a\u306b\u304f\u3044\u3002max-width\u3067\u5236\u5fa1<\/td><\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.article-body {\n  font-size: 16px;\n  line-height: 1.8;        \/* \u884c\u9593\u306f\u5358\u4f4d\u306a\u3057\u304c\u304a\u3059\u3059\u3081 *\/\n  letter-spacing: 0.02em;\n  max-width: 40em;         \/* 1\u884c\u304c\u7d0440\u5b57\u3067\u6298\u308a\u8fd4\u3059 *\/\n}<\/code><\/pre><\/div>\n\n<p class=\"wp-block-paragraph\">\u7279\u306b <code>line-height<\/code> \u306f<strong><span class=\"swl-marker mark_yellow\">\u5358\u4f4d\u306a\u3057\uff081.8\u306a\u3069\uff09\u3067\u6307\u5b9a<\/span><\/strong>\u3059\u308b\u306e\u304c\u9244\u5247\u3067\u3059\u3002px\u6307\u5b9a\u3059\u308b\u3068\u5b50\u8981\u7d20\u3067\u884c\u9593\u304c\u5d29\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\">iOS Safari\u306e\u81ea\u52d5\u30ba\u30fc\u30e0\u3092\u9632\u3050\u300c\u30d5\u30a9\u30fc\u30e016px\u30eb\u30fc\u30eb\u300d<\/h2>\n\n<p class=\"wp-block-paragraph\">\u610f\u5916\u3068\u77e5\u3089\u308c\u3066\u3044\u306a\u3044\u843d\u3068\u3057\u7a74\u304c\u3001<strong><span class=\"swl-marker mark_yellow\">iOS Safari\u306f\u5165\u529b\u30d5\u30a9\u30fc\u30e0\u306e\u6587\u5b57\u304c16px\u672a\u6e80\u3060\u3068\u81ea\u52d5\u3067\u30ba\u30fc\u30e0\u3059\u308b<\/span><\/strong>\u3068\u3044\u3046\u6319\u52d5\u3067\u3059\u3002\u554f\u3044\u5408\u308f\u305b\u30d5\u30a9\u30fc\u30e0\u3084\u691c\u7d22\u7a93\u3067\u3053\u308c\u304c\u8d77\u304d\u308b\u3068\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u5d29\u308c\u3066UX\u3092\u640d\u306a\u3044\u307e\u3059\u3002<\/p>\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5165\u529b\u6b04\u306f16px\u4ee5\u4e0a\u306b\u3057\u3066iOS\u306e\u81ea\u52d5\u30ba\u30fc\u30e0\u3092\u9632\u3050 *\/\ninput,\ntextarea,\nselect {\n  font-size: 16px;   \/* 15px\u4ee5\u4e0b\u3060\u3068iOS\u304c\u30ba\u30fc\u30e0\u3057\u3066\u3057\u307e\u3046 *\/\n}<\/code><\/pre><\/div>\n\n<p class=\"wp-block-paragraph\">\u898b\u305f\u76ee\u306e\u90fd\u5408\u3067\u5c0f\u3055\u304f\u3057\u305f\u3044\u5834\u5408\u3067\u3082\u3001<strong>\u30d5\u30a9\u30fc\u30e0\u8981\u7d20\u3060\u3051\u306f16px\u4ee5\u4e0a<\/strong>\u3092\u5b88\u308b\u306e\u304c\u5b89\u5168\u3067\u3059\u3002<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\">\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\uff5c\u30e6\u30fc\u30b6\u30fc\u306e\u6587\u5b57\u30b5\u30a4\u30ba\u8a2d\u5b9a\u3092\u5c0a\u91cd\u3059\u308b<\/h2>\n\n<p class=\"wp-block-paragraph\">\u30d6\u30e9\u30a6\u30b6\u3084OS\u306b\u306f\u300c\u6587\u5b57\u3092\u5927\u304d\u304f\u3059\u308b\u300d\u8a2d\u5b9a\u304c\u3042\u308a\u307e\u3059\u3002<code>px<\/code> \u3067\u56fa\u5b9a\u3059\u308b\u3068\u3053\u306e\u8a2d\u5b9a\u304c\u7121\u8996\u3055\u308c\u3066\u3057\u307e\u3046\u305f\u3081\u3001<strong><span class=\"swl-marker mark_yellow\">\u672c\u6587\u306f rem \u306a\u3069\u76f8\u5bfe\u5358\u4f4d\u3067\u6307\u5b9a\u3059\u308b<\/span><\/strong>\u3053\u3068\u304c\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306e\u57fa\u672c\u3067\u3059\u3002<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u672c\u6587\u30fb\u898b\u51fa\u3057\u306f <code>rem<\/code> \u3067\u6307\u5b9a\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u62e1\u5927\u8a2d\u5b9a\u306b\u8ffd\u5f93\u3055\u305b\u308b<\/li>\n<li>\u30b3\u30f3\u30c8\u30e9\u30b9\u30c8\u6bd4\u306f\u672c\u6587\u3067 <strong>4.5:1 \u4ee5\u4e0a<\/strong>\uff08WCAG AA\uff09\u3092\u78ba\u4fdd\u3059\u308b<\/li>\n<li><code>min()<\/code> \u3084 <code>clamp()<\/code> \u3067\u4e0b\u965016px\u524d\u5f8c\u3092\u62c5\u4fdd\u3059\u308b<\/li>\n<li>important \u3067\u30e6\u30fc\u30b6\u30fc\u30b9\u30bf\u30a4\u30eb\u3092\u6253\u3061\u6d88\u3055\u306a\u3044<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">WCAG 2.1\u3067\u306f\u3001\u30c6\u30ad\u30b9\u30c8\u3092200%\u307e\u3067\u62e1\u5927\u3057\u3066\u3082\u60c5\u5831\u304c\u5931\u308f\u308c\u306a\u3044\u3053\u3068\u304c\u6c42\u3081\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u76f8\u5bfe\u5358\u4f4d\u3067\u306e\u8a2d\u8a08\u306f\u3001\u3088\u308a\u591a\u304f\u306e\u4eba\u306b\u5c4a\u304f\u30b5\u30a4\u30c8\u3065\u304f\u308a\u306e\u571f\u53f0\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\">\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u8a2d\u8a08\u3067\u3088\u304f\u3042\u308b\u5931\u6557\u3068\u5bfe\u51e6\u6cd5<\/h2>\n\n<figure class=\"wp-block-table\"><table>\n<thead><tr><th>\u3088\u304f\u3042\u308b\u5931\u6557<\/th><th>\u4f55\u304c\u554f\u984c\u304b<\/th><th>\u5bfe\u51e6\u6cd5<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u30b9\u30de\u30db\u672c\u6587\u309212px\u4ee5\u4e0b\u306b\u3059\u308b<\/td><td>Google\u304c\u300c\u5c0f\u3055\u3059\u304e\u308b\u30c6\u30ad\u30b9\u30c8\u300d\u3068\u8b66\u544a\u30fb\u96e2\u8131\u5897<\/td><td>\u672c\u6587\u306f\u6700\u4f4e14px\u3001\u63a8\u596816px<\/td><\/tr>\n<tr><td>px\u56fa\u5b9a\u3067\u30b5\u30a4\u30c8\u5168\u4f53\u3092\u7d44\u3080<\/td><td>\u30e6\u30fc\u30b6\u30fc\u306e\u6587\u5b57\u62e1\u5927\u304c\u52b9\u304b\u305aa11y\u4f4e\u4e0b<\/td><td>\u672c\u6587\u30fb\u898b\u51fa\u3057\u306frem\u3067\u6307\u5b9a<\/td><\/tr>\n<tr><td>\u30d5\u30a9\u30fc\u30e0\u309215px\u4ee5\u4e0b\u306b\u3059\u308b<\/td><td>iOS Safari\u304c\u81ea\u52d5\u30ba\u30fc\u30e0\u3057\u3066\u30ec\u30a4\u30a2\u30a6\u30c8\u5d29\u308c<\/td><td>input\u7b49\u306f16px\u4ee5\u4e0a<\/td><\/tr>\n<tr><td>\u898b\u51fa\u3057\u3068\u672c\u6587\u306e\u5dee\u304c\u5c0f\u3055\u3044<\/td><td>\u968e\u5c64\u304c\u4f1d\u308f\u3089\u305a\u8aad\u307f\u306b\u304f\u3044<\/td><td>\u30b8\u30e3\u30f3\u30d7\u7387\u3092\u610f\u8b58\u30571.5\u500d\u4ee5\u4e0a\u5dee\u3092\u3064\u3051\u308b<\/td><\/tr>\n<tr><td>line-height\u3092px\u3067\u6307\u5b9a<\/td><td>\u5b50\u8981\u7d20\u3067\u884c\u9593\u304c\u5d29\u308c\u308b<\/td><td>\u5358\u4f4d\u306a\u3057(1.5\u301c1.8)\u3067\u6307\u5b9a<\/td><\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\">\u5b9f\u88c5\u524d\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h2>\n\n<ul class=\"wp-block-list\">\n<li>\u672c\u6587\uff1aPC 16\u301c18px \/ \u30b9\u30de\u30db 14\u301c16px \u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u304b<\/li>\n<li>\u30b9\u30de\u30db\u306e\u6700\u5c0f\u6587\u5b57\u304c12px\u672a\u6e80\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u304b<\/li>\n<li>\u672c\u6587\u30fb\u898b\u51fa\u3057\u3092 rem \u306a\u3069\u76f8\u5bfe\u5358\u4f4d\u3067\u6307\u5b9a\u3057\u305f\u304b<\/li>\n<li>\u30d5\u30a9\u30fc\u30e0\u8981\u7d20\uff08input\u7b49\uff09\u306f16px\u4ee5\u4e0a\u304b<\/li>\n<li>line-height\u306f1.5\u301c1.8\u30fb\u5358\u4f4d\u306a\u3057\u3067\u6307\u5b9a\u3057\u305f\u304b<\/li>\n<li>1\u884c\u306e\u9577\u3055\u306f\u5168\u89d235\u301c45\u5b57\u306b\u53ce\u307e\u3063\u3066\u3044\u308b\u304b<\/li>\n<li>\u898b\u51fa\u3057\u3068\u672c\u6587\u306b\u30b8\u30e3\u30f3\u30d7\u7387\uff081.5\u500d\u4ee5\u4e0a\uff09\u306e\u5dee\u304c\u3042\u308b\u304b<\/li>\n<li>clamp()\u3084\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc\u3057\u305f\u304b<\/li>\n<\/ul>\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081\uff5c\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f\u300c\u6570\u5024\u300d\u3068\u300c\u76f8\u5bfe\u8a2d\u8a08\u300d\u306e\u4e21\u8f2a\u3067\u6c7a\u3081\u308b<\/h2>\n\n<p class=\"wp-block-paragraph\">Web\u30c7\u30b6\u30a4\u30f3\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f\u3001\u611f\u899a\u3067\u306f\u306a\u304f\u6839\u62e0\u306e\u3042\u308b\u6570\u5024\u3067\u6c7a\u3081\u308b\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002\u6700\u5f8c\u306b\u8981\u70b9\u3092\u632f\u308a\u8fd4\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u672c\u6587\u306f <strong>PC 16\u301c18px \/ \u30b9\u30de\u30db 14\u301c16px<\/strong>\u3002\u30b9\u30de\u30db12px\u672a\u6e80\u306fNG<\/li>\n<li>\u5358\u4f4d\u306f\u672c\u6587\u30fb\u898b\u51fa\u3057\u306b <code>rem<\/code>\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u306b <code>em<\/code>\u3001\u56fa\u5b9a\u8981\u7d20\u306b <code>px<\/code><\/li>\n<li><code>clamp()<\/code> \u3067\u6d41\u4f53\u30bf\u30a4\u30dd\u306b\u3059\u308c\u3070\u3069\u306e\u753b\u9762\u5e45\u3067\u3082\u8aad\u307f\u3084\u3059\u3044<\/li>\n<li>\u884c\u95931.5\u301c1.8\u30fb\u884c\u957735\u301c45\u5b57\u307e\u3067\u30bb\u30c3\u30c8\u3067\u6574\u3048\u308b<\/li>\n<li>\u30d5\u30a9\u30fc\u30e0\u306f16px\u4ee5\u4e0a\u3067iOS\u306e\u81ea\u52d5\u30ba\u30fc\u30e0\u3092\u9632\u3050<\/li>\n<\/ul>\n\n<p class=\"is-style-big_icon_point wp-block-paragraph\"><strong>\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f\u300c\u8aad\u307f\u3084\u3059\u3055\uff1d\u6210\u679c\u300d\u306b\u76f4\u7d50\u3059\u308b\u3002<br \/>\u6570\u5024\u306e\u57fa\u6e96\u3092\u62bc\u3055\u3048\u3001rem\uff0bclamp()\u3067\u76f8\u5bfe\u7684\u306b\u8a2d\u8a08\u3057\u3088\u3046\u3002<\/strong><\/p>\n\n<p class=\"wp-block-paragraph\">\u307e\u305a\u306f\u81ea\u5206\u306e\u30b5\u30a4\u30c8\u306e\u672c\u6587\u3068\u898b\u51fa\u3057\u306e\u30b5\u30a4\u30ba\u3092\u898b\u76f4\u3059\u3068\u3053\u308d\u304b\u3089\u59cb\u3081\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\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\n<h3 class=\"wp-block-heading\">Q1. PC\u3068\u30b9\u30de\u30db\u3067\u63a8\u5968\u3055\u308c\u308b\u672c\u6587\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f\u4f55px\u3067\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> PC\uff08\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\uff09\u306e\u672c\u6587\u306f16px\u301c18px\u304c\u57fa\u672c\u3067\u300116px\u304c\u696d\u754c\u6a19\u6e96\u3067\u3059\u3002\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u306e\u672c\u6587\u306f\u6700\u4f4e14px\u3001\u63a8\u596816px\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u304b\u3064\u3066PC\u306f14px\u304c\u4e3b\u6d41\u3067\u3057\u305f\u304c\u3001\u9ad8\u89e3\u50cf\u5ea6\u30c7\u30a3\u30b9\u30d7\u30ec\u30a4\u306e\u666e\u53ca\u306b\u3088\u308a\u73fe\u5728\u306f16px\u301c18px\u304c\u6a19\u6e96\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q2. \u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306fSEO\u306b\u5f71\u97ff\u3057\u307e\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> \u5f71\u97ff\u3057\u307e\u3059\u3002Google\u306fCore Web Vitals\u3084\u30e2\u30d0\u30a4\u30eb\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc\u8a55\u4fa1\u3067\u30c6\u30ad\u30b9\u30c8\u306e\u53ef\u8aad\u6027\u3092\u30e9\u30f3\u30ad\u30f3\u30b0\u8981\u56e0\u3068\u3057\u3066\u8003\u616e\u3057\u3066\u304a\u308a\u3001\u7279\u306b\u30e2\u30d0\u30a4\u30eb\u3067\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u304c12px\u672a\u6e80\u306e\u5834\u5408\u306fGoogle Search Console\u3067\u300c\u5c0f\u3055\u3059\u304e\u308b\u30c6\u30ad\u30b9\u30c8\u300d\u3068\u3057\u3066\u8b66\u544a\u304c\u8868\u793a\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u9069\u5207\u306a\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306fSEO\u6539\u5584\u306b\u76f4\u7d50\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q3. px\u30fbrem\u30fbem\u306f\u3069\u3046\u4f7f\u3044\u5206\u3051\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> px\u306f\u753b\u9762\u4e0a\u306e\u7d76\u5bfe\u7684\u306a\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3057\u518d\u73fe\u6027\u304c\u9ad8\u3044\u4e00\u65b9\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u30d6\u30e9\u30a6\u30b6\u6587\u5b57\u30b5\u30a4\u30ba\u5909\u66f4\u304c\u53cd\u6620\u3055\u308c\u305a\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u3067\u52a3\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002rem\u306fHTML\u306e\u30eb\u30fc\u30c8\u8981\u7d20\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\uff08\u30c7\u30d5\u30a9\u30eb\u30c816px\uff09\u3092\u57fa\u6e96\u3068\u3059\u308b\u76f8\u5bfe\u5358\u4f4d\u3067\u3001\u30eb\u30fc\u30c8\u3092\u5909\u66f4\u3059\u308b\u3060\u3051\u3067\u30b5\u30a4\u30c8\u5168\u4f53\u3092\u4e00\u62ec\u8abf\u6574\u3067\u304d\u3001\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306b\u3082\u512a\u308c\u307e\u3059\u3002em\u306f\u8981\u7d20\u3092\u57fa\u6e96\u3068\u3059\u308b\u76f8\u5bfe\u5358\u4f4d\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Q4. \u898b\u51fa\u3057\u306e\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306f\u3069\u308c\u304f\u3089\u3044\u304c\u9069\u5207\u3067\u3059\u304b\uff1f<\/h3>\n\n\n<p class=\"wp-block-paragraph\"><strong>A.<\/strong> PC\u3067\u306fh1\u304c32\u301c48px\u3001h2\u304c24\u301c32px\u3001h3\u304c18\u301c24px\u304c\u76ee\u5b89\u3067\u3059\u3002\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\u3067\u306fh1\u304c24\u301c32px\u3001h2\u304c20\u301c24px\u3001h3\u304c16\u301c20px\u3068PC\u3088\u308a\u5c0f\u3055\u304f\u3057\u3066\u30d0\u30e9\u30f3\u30b9\u3092\u53d6\u308a\u307e\u3059\u3002\u3044\u305a\u308c\u3082\u672c\u6587\u3068\u306e\u5dee\u3092\u610f\u8b58\u3057\u3066\u3064\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n<h3 class=\"wp-block-heading\">Q5. clamp()\u3092\u4f7f\u3063\u305f\u6d41\u4f53\u30bf\u30a4\u30dd\u30b0\u30e9\u30d5\u30a3\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n<p><strong>A.<\/strong> clamp(\u6700\u5c0f\u5024, \u63a8\u5968\u5024, \u6700\u5927\u5024)\u3068\u3044\u3046CSS\u95a2\u6570\u3092\u4f7f\u3044\u3001\u753b\u9762\u5e45\u306b\u5fdc\u3058\u3066\u6587\u5b57\u30b5\u30a4\u30ba\u3092\u306a\u3081\u3089\u304b\u306b\u5909\u5316\u3055\u305b\u308b\u624b\u6cd5\u3067\u3059\u3002\u305f\u3068\u3048\u3070font-size: clamp(28px, 5vw, 48px);\u3068\u3059\u308b\u3068\u3001\u72ed\u3044\u753b\u9762\u3067\u306f28px\u3001\u5e83\u3044\u753b\u9762\u3067\u306f\u6700\u592748px\u307e\u3067\u62e1\u5927\u3057\u3001\u305d\u306e\u9593\u306fvw\u306b\u5fdc\u3058\u3066\u9023\u7d9a\u7684\u306b\u5909\u308f\u308a\u307e\u3059\u3002\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u306e\u8a18\u8ff0\u3092\u6e1b\u3089\u3057\u3064\u3064\u3001\u3069\u306e\u753b\u9762\u5e45\u3067\u3082\u8aad\u307f\u3084\u3059\u3044\u30b5\u30a4\u30ba\u3092\u4fdd\u3066\u307e\u3059\u3002\u6700\u5c0f\u5024\u306f16px\u524d\u5f8c\u3092\u78ba\u4fdd\u3059\u308b\u306e\u304c\u30dd\u30a4\u30f3\u30c8\u3067\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">Q6. rem\u306e\u8a08\u7b97\u304c\u9762\u5012\u3067\u3059\u3002\u30e9\u30af\u306b\u3059\u308b\u65b9\u6cd5\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n<p><strong>A.<\/strong> \u30eb\u30fc\u30c8\u8981\u7d20\u306bfont-size: 62.5%\u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5\u304c\u5b9a\u756a\u3067\u3059\u3002\u30d6\u30e9\u30a6\u30b6\u6a19\u6e96\u306e16px \u00d7 62.5% = 10px\u304c\u57fa\u6e96\u306b\u306a\u308b\u305f\u3081\u30011.6rem\uff1d16px\u30013.2rem\uff1d32px\u306e\u3088\u3046\u306b10\u500d\u3067\u76f4\u611f\u7684\u306b\u63db\u7b97\u3067\u304d\u307e\u3059\u3002\u8a08\u7b97\u306e\u624b\u9593\u304c\u5927\u304d\u304f\u6e1b\u308a\u3001rem\u306e\u30e1\u30ea\u30c3\u30c8\uff08\u30b5\u30a4\u30c8\u5168\u4f53\u306e\u4e00\u62ec\u8abf\u6574\u30fb\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\uff09\u306f\u305d\u306e\u307e\u307e\u6d3b\u304b\u305b\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">Q7. \u30b9\u30de\u30db\u306e\u30d5\u30a9\u30fc\u30e0\u3067\u52dd\u624b\u306b\u30ba\u30fc\u30e0\u3055\u308c\u308b\u306e\u3092\u9632\u3050\u306b\u306f\uff1f<\/h3>\n<p><strong>A.<\/strong> input\u30fbtextarea\u30fbselect\u306a\u3069\u306e\u30d5\u30a9\u30fc\u30e0\u8981\u7d20\u306efont-size\u309216px\u4ee5\u4e0a\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002iOS Safari\u306f\u5165\u529b\u6b04\u306e\u6587\u5b57\u304c16px\u672a\u6e80\u3060\u3068\u3001\u30d5\u30a9\u30fc\u30ab\u30b9\u6642\u306b\u81ea\u52d5\u3067\u30ba\u30fc\u30e0\u3059\u308b\u4ed5\u69d8\u304c\u3042\u308a\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u5d29\u308c\u306e\u539f\u56e0\u306b\u306a\u308a\u307e\u3059\u3002\u898b\u305f\u76ee\u4e0a\u5c0f\u3055\u304f\u3057\u305f\u3044\u5834\u5408\u3067\u3082\u3001\u30d5\u30a9\u30fc\u30e0\u8981\u7d20\u3060\u3051\u306f16px\u4ee5\u4e0a\u3092\u5b88\u308b\u306e\u304c\u5b89\u5168\u3067\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">Q8. \u884c\u9593\uff08line-height\uff09\u306e\u76ee\u5b89\u306f\u3069\u308c\u304f\u3089\u3044\u3067\u3059\u304b\uff1f<\/h3>\n<p><strong>A.<\/strong> \u672c\u6587\u3067\u306f1.5\u301c1.8\u304c\u76ee\u5b89\u3067\u3001\u65e5\u672c\u8a9e\u306e\u9577\u6587\u306f1.75\u524d\u5f8c\u304c\u8aad\u307f\u3084\u3059\u3044\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u6307\u5b9a\u306f\u5358\u4f4d\u306a\u3057\uff08line-height: 1.8;\uff09\u3067\u884c\u3046\u306e\u304c\u9244\u5247\u3067\u3059\u3002px\u3067\u6307\u5b9a\u3059\u308b\u3068\u3001\u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306e\u7570\u306a\u308b\u5b50\u8981\u7d20\u3067\u884c\u9593\u304c\u5d29\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3042\u308f\u305b\u30661\u884c\u306e\u9577\u3055\u3092\u5168\u89d235\u301c45\u5b57\u306b\u53ce\u3081\u308b\u3068\u3001\u3055\u3089\u306b\u8aad\u307f\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">Q9. \u30d5\u30a9\u30f3\u30c8\u30b5\u30a4\u30ba\u306e\u5358\u4f4d\u306f\u7d50\u5c40\u3069\u308c\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u304b\uff1f<\/h3>\n<p><strong>A.<\/strong> \u672c\u6587\u3084\u898b\u51fa\u3057\u306a\u3069\u30b5\u30a4\u30c8\u5168\u4f53\u306e\u6587\u5b57\u306b\u306frem\u304c\u6700\u3082\u304a\u3059\u3059\u3081\u3067\u3059\u3002\u30eb\u30fc\u30c8\u8981\u7d20\u3092\u5909\u3048\u308b\u3060\u3051\u3067\u5168\u4f53\u3092\u4e00\u62ec\u8abf\u6574\u3067\u304d\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u6587\u5b57\u62e1\u5927\u8a2d\u5b9a\u306b\u3082\u8ffd\u5f93\u3059\u308b\u305f\u3081\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u306b\u512a\u308c\u307e\u3059\u3002\u30dc\u30bf\u30f3\u3084\u30ab\u30fc\u30c9\u306a\u3069\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u3067\u76f8\u5bfe\u7684\u306b\u305d\u308d\u3048\u305f\u3044\u3068\u304d\u306fem\u3001\u67a0\u7dda\u306a\u3069\u56fa\u5b9a\u3057\u305f\u3044\u7d30\u90e8\u306b\u306fpx\u3092\u4f7f\u3046\u3001\u3068\u3044\u3046\u4f7f\u3044\u5206\u3051\u304c\u73fe\u4ee3\u7684\u306a\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3067\u3059\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\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<li><a href=\"https:\/\/withcode.tech\/media\/what-is-web-design\/\">Web\u30c7\u30b6\u30a4\u30f3\u3068\u306f\uff1f\u521d\u5fc3\u8005\u3067\u3082\u308f\u304b\u308b\u89e3\u8aac<\/a><\/li>\n<li><a 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