{"id":9924,"date":"2025-11-20T19:43:51","date_gmt":"2025-11-20T10:43:51","guid":{"rendered":"https:\/\/code-plus.jp\/gp\/?p=9924"},"modified":"2026-01-08T11:13:30","modified_gmt":"2026-01-08T02:13:30","slug":"setstyles-breakpoint-9924","status":"publish","type":"post","link":"https:\/\/code-plus.jp\/gp\/setstyles-breakpoint-9924\/","title":{"rendered":"\u30b9\u30de\u30db\u3068PC\u3067\u5225\u3005\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3059\u308bJavaScript <br>-JavaScript\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316-"},"content":{"rendered":"<p>\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30b5\u30a4\u30c8\u3092\u5236\u4f5c\u3057\u3066\u3044\u308b\u3068\u3001\u300c\u30b9\u30de\u30db\u3068PC\u3067\u753b\u50cf\u3082\u30c7\u30b6\u30a4\u30f3\u3082\u5168\u304f\u9055\u3046\u300d\u300c1\u7b87\u6240\u3060\u3051\u5225\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u305f\u3044\u300d\u3068\u3044\u3063\u305f\u5834\u9762\u306b\u906d\u9047\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u30b9\u30de\u30db\u3068PC\u3067\u753b\u50cf\u30b5\u30a4\u30ba\u304c\u5927\u304d\u304f\u7570\u306a\u308a\u3001\u500b\u5225\u306b\u8abf\u6574\u304c\u5fc5\u8981<\/li>\r\n  <li>\u540c\u3058\u30af\u30e9\u30b9\u306e\u8981\u7d20\u306e\u4e2d\u3067\u30011\u7b87\u6240\u3060\u3051\u4f8b\u5916\u7684\u306a\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u305f\u3044<\/li>\r\n  <li>CSS\u306b\u30af\u30e9\u30b9\u3092\u5927\u91cf\u306b\u4f5c\u308b\u3068\u7ba1\u7406\u304c\u7169\u96d1\u306b\u306a\u308b<\/li>\r\n  <li>\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u304c\u80a5\u5927\u5316\u3057\u3066\u4fdd\u5b88\u6027\u304c\u4f4e\u4e0b\u3057\u3066\u3044\u308b<\/li>\r\n<\/ul>\r\n<p>\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3060\u3051\u3067\u306f\u5bfe\u5fdc\u3057\u304d\u308c\u306a\u3044\u3001<b class=\"bold\">\u8981\u7d20\u3054\u3068\u306b\u7570\u306a\u308b\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30b9\u30bf\u30a4\u30eb<\/b>\u3092\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\r\n\r\n <!-- \u2605\u76ee\u6b21\u30ea\u30b9\u30c8 -->\r\n<ul class=\"tocList mt-1r\" data-toc-id=\"js-tocBWGD\"><\/ul>\r\n<ins class=\"tocBtn is-fixed\" data-toc-id=\"js-tocBWGD\"><\/ins>\r\n<!-- \u76ee\u6b21\uff1aJS -->\r\n<script src=\"https:\/\/code-plus.jp\/cdn\/js\/_gimmicks\/inppend-tocList.js\"><\/script>\r\n<script src=\"https:\/\/code-plus.jp\/cdn\/js\/_gimmicks\/inppend-tocBtn.js\"><\/script>\r\n\r\n\r\n\r\n\r\n<hr class=\"rule-hory mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">\u3069\u3046\u3044\u3046\u6642\u306b\u4fbf\u5229\u304b<\/h2>\r\n<h3 class=\"fz-ml\">\u30b1\u30fc\u30b91\uff1a\u30b9\u30de\u30db\u3068PC\u3067\u753b\u50cf\u30b5\u30a4\u30ba\u304c\u30d0\u30e9\u30d0\u30e9<\/h3>\r\n<p>\u30c7\u30b6\u30a4\u30f3\u30ab\u30f3\u30d7\u3067\u3001\u5404\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u30bf\u30a4\u30c8\u30eb\u753b\u50cf\u306e\u30b5\u30a4\u30ba\u304c\u5168\u3066\u7570\u306a\u308b\u5834\u5408\uff1a<\/p>\r\n<pre><code class=\"language-html\">&lt;section&gt;\r\n  &lt;img src=&quot;img\/section-a-title.svg&quot; data-style_sp=&quot;width:57vw;&quot; data-style_pc=&quot;width:54vw;&quot;&gt;\r\n&lt;\/section&gt;\r\n\r\n&lt;section&gt;\r\n  &lt;img src=&quot;img\/section-b-title.svg&quot; data-style_sp=&quot;width:91vw;&quot; data-style_pc=&quot;width:82.8vw;&quot;&gt;\r\n&lt;\/section&gt;\r\n\r\n&lt;section&gt;\r\n  &lt;img src=&quot;img\/section-c-title.svg&quot; data-style_sp=&quot;width:52vw;&quot; data-style_pc=&quot;width:49vw;&quot;&gt;\r\n&lt;\/section&gt;\r\n<\/code><\/pre>\r\n<p><b class=\"bold\">data\u5c5e\u6027\u3092\u4f7f\u3046\u3068\uff1a<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>HTML\u306b\u76f4\u63a5\u30b5\u30a4\u30ba\u3092\u8a18\u8ff0\u3067\u304d\u308b<\/li>\r\n  <li>CSS\u30d5\u30a1\u30a4\u30eb\u306e\u80a5\u5927\u5316\u3092\u9632\u3052\u308b<\/li>\r\n  <li>\u30c7\u30b6\u30a4\u30f3\u5909\u66f4\u6642\u306e\u4fee\u6b63\u7b87\u6240\u304c\u660e\u78ba<\/li>\r\n<\/ul>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h3 class=\"fz-ml\">\u30b1\u30fc\u30b92\uff1a1\u7b87\u6240\u3060\u3051\u4f8b\u5916\u7684\u306a\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528<\/h3>\r\n<p>\u5171\u901a\u30af\u30e9\u30b9\u3067\u7ba1\u7406\u3057\u3066\u3044\u308b\u8981\u7d20\u306e\u4e2d\u3067\u30011\u7b87\u6240\u3060\u3051\u7570\u306a\u308b\u30b9\u30bf\u30a4\u30eb\u304c\u5fc5\u8981\u306a\u5834\u5408\uff1a<\/p>\r\n<pre><code class=\"language-html\">&lt;!-- \u901a\u5e38\u306f\u3053\u306e\u30af\u30e9\u30b9\u3067\u7d71\u4e00 --&gt;\r\n&lt;ul class=&quot;shelf-wrapper mt-3r&quot;&gt;\r\n  &lt;li&gt;\u30a2\u30a4\u30c6\u30e01&lt;\/li&gt;\r\n&lt;\/ul&gt;\r\n\r\n&lt;!-- \u3067\u3082\u3001\u3053\u3053\u3060\u3051 margin-top \u3092\u5909\u3048\u305f\u3044 --&gt;\r\n&lt;ul class=&quot;shelf-wrapper mt-3r&quot; data-style_pc=&quot;margin-top:5.2vw;&quot;&gt;\r\n  &lt;li&gt;\u30a2\u30a4\u30c6\u30e02&lt;\/li&gt;\r\n&lt;\/ul&gt;\r\n<\/code><\/pre>\r\n<p><b class=\"bold\">data\u5c5e\u6027\u3092\u4f7f\u3046\u3068\uff1a<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u4f8b\u5916\u7528\u306e\u30af\u30e9\u30b9\u3092\u4f5c\u3089\u306a\u304f\u3066\u6e08\u3080<\/li>\r\n  <li>HTML\u3060\u3051\u3067\u5b8c\u7d50\u3057\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3057\u3084\u3059\u3044<\/li>\r\n  <li>\u30c7\u30b6\u30a4\u30ca\u30fc\u3068\u306e\u610f\u601d\u758e\u901a\u3082\u30b9\u30e0\u30fc\u30ba<\/li>\r\n<\/ul>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h2 class=\"fz-xl\">\u5b9f\u88c5\u65b9\u6cd5<\/h2>\r\n<h3 class=\"fz-ml\">1. JavaScript \u30d5\u30a1\u30a4\u30eb\u306e\u6e96\u5099<\/h3>\r\n<p>\u4ee5\u4e0b\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3057\u3066\u3001HTML\u306b\u8aad\u307f\u8fbc\u307f\u307e\u3059\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;script src=&quot;https:\/\/gist.github.com\/sarap422\/419e5d3bd1ed764044daeb468a04a554.js&quot;&gt;&lt;\/script&gt;\r\n<\/code><\/pre>\r\n<p><b class=\"bold\">setStyles-breakpoint.js - GitHub Gist<\/b><br \/>\r\n  \u2192 <cite><a href=\"https:\/\/gist.github.com\/sarap422\/419e5d3bd1ed764044daeb468a04a554\" class=\"link\" target=\"_blank\">https:\/\/gist.github.com\/sarap422\/419e5d3bd1ed764044daeb468a04a554<\/a><\/cite><\/p>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h3 class=\"fz-ml\">2. HTML \u306b data\u5c5e\u6027\u3092\u8ffd\u52a0<\/h3>\r\n<pre><code class=\"language-html\">&lt;!-- \u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9 --&gt;\r\n&lt;div data-style_sp=&quot;width:100%;&quot; data-style_pc=&quot;width:80rem;&quot;&gt;\r\n  \u30b3\u30f3\u30c6\u30f3\u30c4\r\n&lt;\/div&gt;\r\n\r\n&lt;!-- \u8907\u6570\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3082\u6307\u5b9a\u53ef\u80fd --&gt;\r\n&lt;section data-style_sp=&quot;padding:1rem; margin:2rem 0;&quot; \r\n         data-style_pc=&quot;padding:3rem; margin:5rem auto;&quot;&gt;\r\n  \u30b3\u30f3\u30c6\u30f3\u30c4\r\n&lt;\/section&gt;\r\n\r\n&lt;!-- \u7247\u65b9\u3060\u3051\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd --&gt;\r\n&lt;img src=&quot;image.jpg&quot; data-style_pc=&quot;width:50vw;&quot;&gt;\r\n<\/code><\/pre>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h3 class=\"fz-ml\">3. CSS \u306b contain \u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8ffd\u52a0\uff08\u63a8\u5968\uff09<\/h3>\r\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u3001base.css \u306b\u4ee5\u4e0b\u3092\u8ffd\u52a0\u3057\u307e\u3059\uff1a<\/p>\r\n<pre><code class=\"language-css\">\/* \u518d\u63cf\u753b\u306e\u6700\u9069\u5316 *\/\r\n:is([data-style_sp], [data-style_pc]) {\r\n  contain: style;\r\n}\r\n<\/code><\/pre>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h2 class=\"fz-xl\">JavaScript\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h2>\r\n<p>\u3053\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u6700\u9069\u5316\u3092\u5b9f\u88c5\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\r\n<h3 class=\"fz-ml\">1. \u30d6\u30ec\u30a4\u30af\u30dd\u30a4\u30f3\u30c8\u3092\u307e\u305f\u3044\u3060\u6642\u306e\u307f\u51e6\u7406\u3092\u5b9f\u884c<\/h3>\r\n<pre><code class=\"language-javascript\">\/\/ \u30d6\u30ec\u30a4\u30af\u30dd\u30a4\u30f3\u30c8\uff08744px\uff09\u3092\u307e\u305f\u3044\u3060\u6642\u306e\u307f\u51e6\u7406\u3092\u5b9f\u884c\r\nif (lastBreakpoint === currentBreakpoint) {\r\n  return; \/\/ \u540c\u3058\u30d6\u30ec\u30a4\u30af\u30dd\u30a4\u30f3\u30c8\u5185\u3067\u306f\u30b9\u30ad\u30c3\u30d7\r\n}\r\n<\/code><\/pre>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u30ea\u30b5\u30a4\u30ba\u30a4\u30d9\u30f3\u30c8\u306e\u51e6\u7406\u3092 <b class=\"bold\">\u7d0480\u301c90%\u524a\u6e1b<\/b><\/li>\r\n  <li>\u4e0d\u8981\u306a DOM \u64cd\u4f5c\u3092\u56de\u907f<\/li>\r\n<\/ul>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h3 class=\"fz-ml\">2. \u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f7f\u7528\u3057\u3066\u3001querySelectorAll \u306e\u5b9f\u884c\u56de\u6570\u3092\u6700\u5c0f\u5316<\/h3>\r\n<pre><code class=\"language-javascript\">\/\/ \u521d\u56de\u306e\u307f\u8981\u7d20\u3092\u53d6\u5f97\u3001\u4ee5\u964d\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u4f7f\u7528\r\nlet cachedElements = null;\r\n\r\nfunction updateElementsCache() {\r\n  cachedElements = [...document.querySelectorAll(&quot;[data-style_sp], [data-style_pc]&quot;)];\r\n}\r\n<\/code><\/pre>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li><code>querySelectorAll<\/code> \u306e\u5b9f\u884c\u56de\u6570\u3092\u6700\u5c0f\u5316<\/li>\r\n  <li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092 <b class=\"bold\">\u7d0430\u301c40%\u524a\u6e1b<\/b><\/li>\r\n<\/ul>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h3 class=\"fz-ml\">3. requestAnimationFrame \u306b\u3088\u308b\u30b9\u30ed\u30c3\u30c8\u30ea\u30f3\u30b0<\/h3>\r\n<pre><code class=\"language-javascript\">\/\/ \u30d6\u30e9\u30a6\u30b6\u306e\u63cf\u753b\u30bf\u30a4\u30df\u30f3\u30b0\u306b\u540c\u671f\r\nfunction throttledSetStyles() {\r\n  if (!rafTicking) {\r\n    rafTicking = true;\r\n    requestAnimationFrame(() =&gt; {\r\n      setStyles();\r\n      rafTicking = false;\r\n    });\r\n  }\r\n}\r\n<\/code><\/pre>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>60fps \u3092\u7dad\u6301\u3057\u305f\u6ed1\u3089\u304b\u306a\u52d5\u4f5c<\/li>\r\n  <li>debounce\uff08200ms\u5f85\u6a5f\uff09\u3088\u308a <b class=\"bold\">\u7d0412\u500d\u9ad8\u901f<\/b><\/li>\r\n<\/ul>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h3 class=\"fz-ml\">4. getAttribute \u3088\u308a\u9ad8\u901f\u306a dataset API \u3092\u4f7f\u7528<\/h3>\r\n<pre><code class=\"language-javascript\">\/\/ getAttribute \u3088\u308a\u9ad8\u901f\u306a dataset API \u3092\u4f7f\u7528\r\nconst styleValue = element.dataset.style_sp; \/\/ \u9ad8\u901f\r\n\/\/ const styleValue = element.getAttribute(&#39;data-style_sp&#39;); \/\/ \u3084\u3084\u9045\u3044\r\n<\/code><\/pre>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u5c5e\u6027\u53d6\u5f97\u306e\u9ad8\u901f\u5316<\/li>\r\n  <li>\u30d6\u30e9\u30a6\u30b6\u306e\u6700\u9069\u5316\u304c\u52b9\u304d\u3084\u3059\u3044<\/li>\r\n<\/ul>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h3 class=\"fz-ml\">5. MutationObserver \u306b\u3088\u3063\u3066\u3001\u52d5\u7684\u306b\u8ffd\u52a0\u3055\u308c\u305f\u8981\u7d20\u306b\u3082\u5bfe\u5fdc<\/h3>\r\n<pre><code class=\"language-javascript\">\/\/ DOM \u306e\u5909\u66f4\u3092\u76e3\u8996\u3057\u3001\u52d5\u7684\u306b\u8ffd\u52a0\u3055\u308c\u305f\u8981\u7d20\u306b\u3082\u81ea\u52d5\u5bfe\u5fdc\r\nconst observer = new MutationObserver((mutations) =&gt; {\r\n  \/\/ \u65b0\u3057\u3044\u8981\u7d20\u304c\u8ffd\u52a0\u3055\u308c\u305f\u3089\u81ea\u52d5\u3067\u51e6\u7406\r\n});\r\n<\/code><\/pre>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>Ajax \u3084 SPA \u3067\u8981\u7d20\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3082\u81ea\u52d5\u5bfe\u5fdc<\/li>\r\n  <li>\u624b\u52d5\u3067\u306e\u30ea\u30d5\u30ec\u30c3\u30b7\u30e5\u4e0d\u8981<\/li>\r\n<\/ul>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h2 class=\"fz-xl\">\u5b9f\u6e2c\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/h2>\r\n<p>\u5b9f\u969b\u306b500\u500b\u306e\u8981\u7d20\u3067\u8a08\u6e2c\u3057\u305f\u7d50\u679c\uff1a<\/p>\r\n<table class=\"table tbl-responsive\">\r\n  <thead>\r\n    <tr class=\"tier\">\r\n      <th>\u6307\u6a19<\/th>\r\n      <td>\u6700\u9069\u5316\u524d<\/td>\r\n      <td>\u6700\u9069\u5316\u5f8c<\/td>\r\n      <td>\u6539\u5584\u7387<\/td>\r\n    <\/tr>\r\n  <\/thead>\r\n  <tbody>\r\n    <tr class=\"tier\">\r\n      <th><b class=\"bold\">\u5b9f\u884c\u6642\u9593<\/b><\/th>\r\n      <td>2.900ms<\/td>\r\n      <td>0.400ms<\/td>\r\n      <td><b class=\"bold\">86.2%\u9ad8\u901f\u5316<\/b><\/td>\r\n    <\/tr>\r\n    <tr class=\"tier\">\r\n      <th><b class=\"bold\">\u30ea\u30b5\u30a4\u30ba\u51e6\u7406<\/b><\/th>\r\n      <td>\u6bce\u56de\u5b9f\u884c<\/td>\r\n      <td>\u30d6\u30ec\u30a4\u30af\u30dd\u30a4\u30f3\u30c8\u5909\u5316\u6642\u306e\u307f<\/td>\r\n      <td><b class=\"bold\">80-90%\u524a\u6e1b<\/b><\/td>\r\n    <\/tr>\r\n    <tr class=\"tier\">\r\n      <th><b class=\"bold\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/b><\/th>\r\n      <td>\u6bce\u56de querySelectorAll<\/td>\r\n      <td>\u30ad\u30e3\u30c3\u30b7\u30e5\u5229\u7528<\/td>\r\n      <td><b class=\"bold\">30-40%\u524a\u6e1b<\/b><\/td>\r\n    <\/tr>\r\n  <\/tbody>\r\n<\/table>\r\n<hr class=\"rule-hory mt-3r\">\r\n<hr class=\"rule-hory mt-3r\">\r\n<h2 class=\"fz-xl\">\u26a0\ufe0f \u6ce8\u610f\u70b9\u3068\u5236\u7d04<\/h2>\r\n<h3 class=\"fz-ml\">1. \u30d6\u30ec\u30a4\u30af\u30dd\u30a4\u30f3\u30c8\u306f\u56fa\u5b9a\uff08744px\uff09<\/h3>\r\n<p>\u73fe\u5728\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f\u3001\u30d6\u30ec\u30a4\u30af\u30dd\u30a4\u30f3\u30c8\u306f 744px \u56fa\u5b9a\u3067\u3059\u3002\u5909\u66f4\u3057\u305f\u3044\u5834\u5408\u306f\u3001\u30b9\u30af\u30ea\u30d7\u30c8\u5185\u306e\u5b9a\u6570\u3092\u7de8\u96c6\u3057\u3066\u304f\u3060\u3055\u3044\uff1a<\/p>\r\n<pre><code class=\"language-javascript\">const BREAKPOINT = 744; \/\/ \u2190 \u3053\u306e\u5024\u3092\u5909\u66f4\r\n<\/code><\/pre>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h3 class=\"fz-ml\">2. width \/ height \u306e\u307f\u4e0a\u66f8\u304d<\/h3>\r\n<p>\u3053\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u306f\u3001\u65e2\u5b58\u306e <code>style<\/code> \u5c5e\u6027\u304b\u3089 <code>width<\/code> \u3068 <code>height<\/code> \u306e\u307f\u3092\u524a\u9664\u3057\u3066\u304b\u3089\u65b0\u3057\u3044\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u307e\u3059\u3002\u4ed6\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u4fdd\u6301\u3055\u308c\u307e\u3059\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;!-- \u65e2\u5b58\u306e\u30b9\u30bf\u30a4\u30eb --&gt;\r\n&lt;div style=&quot;color:red; width:100px;&quot;&gt;\r\n\r\n&lt;!-- data-style_pc \u304c\u9069\u7528\u3055\u308c\u308b\u3068 --&gt;\r\n&lt;div style=&quot;color:red; width:50vw;&quot;&gt;\r\n  \u2191 color \u306f\u4fdd\u6301\u3001width \u306e\u307f\u4e0a\u66f8\u304d\r\n&lt;\/div&gt;\r\n<\/code><\/pre>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h3 class=\"fz-ml\">3. CSS \u306e\u512a\u5148\u9806\u4f4d<\/h3>\r\n<p>\u30a4\u30f3\u30e9\u30a4\u30f3\u30b9\u30bf\u30a4\u30eb\uff08<code>style<\/code>\u5c5e\u6027\uff09\u306f CSS \u3088\u308a\u3082\u512a\u5148\u3055\u308c\u308b\u305f\u3081\u3001CSS \u3067\u540c\u3058\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u6307\u5b9a\u3057\u3066\u3082\u4e0a\u66f8\u304d\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\r\n<pre><code class=\"language-css\">\/* \u274c \u3053\u308c\u306f\u52b9\u304b\u306a\u3044 *\/\r\n.my-element {\r\n  width: 100px !important; \/* data-style-* \u304c\u512a\u5148\u3055\u308c\u308b *\/\r\n}\r\n<\/code><\/pre>\r\n\r\n<hr class=\"rule-hory mt-3r\">\r\n<h2 class=\"fz-xl\">\u307e\u3068\u3081<\/h2>\r\n<h3 class=\"fz-ml\">\u3053\u306e\u30c6\u30af\u30cb\u30c3\u30af\u304c\u6709\u52b9\u306a\u5834\u9762<\/h3>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u2705 \u30b9\u30de\u30db\u3068PC\u3067\u30c7\u30b6\u30a4\u30f3\u304c\u5927\u304d\u304f\u7570\u306a\u308b <\/li>\r\n  <li>\u2705 \u753b\u50cf\u30b5\u30a4\u30ba\u304c\u8981\u7d20\u3054\u3068\u306b\u30d0\u30e9\u30d0\u30e9 <\/li>\r\n  <li>\u2705 1\u7b87\u6240\u3060\u3051\u4f8b\u5916\u7684\u306a\u30b9\u30bf\u30a4\u30eb\u304c\u5fc5\u8981 <\/li>\r\n  <li>\u2705 CSS\u306e\u80a5\u5927\u5316\u3092\u9632\u304e\u305f\u3044 <\/li>\r\n  <li>\u2705 \u30c7\u30b6\u30a4\u30f3\u5909\u66f4\u304c\u983b\u7e41\u306b\u767a\u751f\u3059\u308b<\/li>\r\n<\/ul>\r\n\r\n<h3 class=\"fz-ml\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30dd\u30a4\u30f3\u30c8<\/h3>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u2705 \u30d6\u30ec\u30a4\u30af\u30dd\u30a4\u30f3\u30c8\u6700\u9069\u5316\u3067\u51e6\u7406\u309280\u301c90%\u524a\u6e1b<\/li>\r\n  <li>\u2705 \u8981\u7d20\u30ad\u30e3\u30c3\u30b7\u30e5\u3067\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u309230\u301c40%\u524a\u6e1b<\/li>\r\n  <li>\u2705 requestAnimationFrame \u306760fps\u3092\u7dad\u6301<\/li>\r\n  <li>\u2705 dataset API \u3067\u9ad8\u901f\u306a\u5c5e\u6027\u30a2\u30af\u30bb\u30b9<\/li>\r\n  <li>\u2705 MutationObserver \u3067\u52d5\u7684\u8981\u7d20\u306b\u3082\u5bfe\u5fdc<\/li>\r\n<\/ul>\r\n\r\n<p>\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067\u306f\u7ba1\u7406\u304c\u5927\u5909\u306a\u300c\u8981\u7d20\u3054\u3068\u306b\u7570\u306a\u308b\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30b9\u30bf\u30a4\u30eb\u300d\u3092\u3001<code>data-*<\/code> \u5c5e\u6027\u3068 JavaScript \u3067\u52b9\u7387\u7684\u306b\u7ba1\u7406\u3059\u308b\u65b9\u6cd5\u3068\u3001JavaScript\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306b\u3064\u3044\u3066\u3054\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002<\/p>\r\n\r\n<hr class=\"rule-hory mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">\u95a2\u9023\u30ea\u30f3\u30af<\/h2>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li><cite><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/HTML\/Global_attributes\/data-*\" class=\"link\" target=\"_blank\">MDN: data-* \u5c5e\u6027<\/a><\/cite><\/li>\r\n  <li><cite><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/HTMLElement\/dataset\" class=\"link\" target=\"_blank\">MDN: dataset API<\/a><\/cite><\/li>\r\n  <li><cite><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/window\/requestAnimationFrame\" class=\"link\" target=\"_blank\">MDN: requestAnimationFrame<\/a><\/cite><\/li>\r\n  <li><cite><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/MutationObserver\" class=\"link\" target=\"_blank\">MDN: MutationObserver<\/a><\/cite><\/li>\r\n  <li><cite><a href=\"https:\/\/web.dev\/css-containment\/\" class=\"link\" target=\"_blank\">Web.dev: CSS Containment<\/a><\/cite><\/li>\r\n<\/ul>","protected":false},"excerpt":{"rendered":"\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u30b5\u30a4\u30c8\u3092\u5236\u4f5c\u3057\u3066\u3044\u308b\u3068\u3001\u300c\u30b9\u30de\u30db\u3068PC\u3067\u753b\u50cf\u3082\u30c7\u30b6\u30a4\u30f3\u3082\u5168\u304f\u9055\u3046\u300d\u300c1\u7b87\u6240\u3060\u3051\u5225\u306e\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u305f\u3044\u300d\u3068\u3044\u3063\u305f\u5834\u9762\u306b\u906d\u9047\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002 \u30b9\u30de\u30db\u3068PC\u3067\u753b\u50cf\u30b5\u30a4\u30ba\u304c\u5927\u304d\u304f\u7570\u306a\u308a\u3001\u500b\u5225\u306b\u8abf\u6574\u304c\u5fc5\u8981 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