{"id":9892,"date":"2025-11-06T16:22:43","date_gmt":"2025-11-06T07:22:43","guid":{"rendered":"https:\/\/code-plus.jp\/gp\/?p=9892"},"modified":"2026-01-08T11:12:35","modified_gmt":"2026-01-08T02:12:35","slug":"will-change-transform-9892","status":"publish","type":"post","link":"https:\/\/code-plus.jp\/gp\/will-change-transform-9892\/","title":{"rendered":"will-change\u3068transform: translateZ(0)\u306e\u843d\u3068\u3057\u7a74 <br>- position:fixed\u304c\u52b9\u304b\u306a\u304f\u306a\u308b\u7406\u7531\u3068\u5bfe\u7b56"},"content":{"rendered":"<p>CSS\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u3067\u3088\u304f\u4f7f\u308f\u308c\u308b<code>will-change<\/code>\u3084<code>transform: translateZ(0)<\/code>\u3002\u3053\u308c\u3089\u306f\u78ba\u304b\u306b\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u6ed1\u3089\u304b\u306b\u3059\u308b\u52b9\u679c\u304c\u3042\u308a\u307e\u3059\u304c\u3001<b class=\"bold\">\u4e88\u671f\u3057\u306a\u3044\u526f\u4f5c\u7528<\/b>\u3092\u5f15\u304d\u8d77\u3053\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\r\n<p>\u305d\u306e\u4ee3\u8868\u7684\u306a\u554f\u984c\u304c\u300c<b class=\"bold\">\u5b50\u8981\u7d20\u306e<code>position: fixed<\/code>\u304c\u6b63\u5e38\u306b\u52d5\u4f5c\u3057\u306a\u304f\u306a\u308b<\/b>\u300d\u73fe\u8c61\u3067\u3059\u3002<\/p>\r\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u306a\u305c\u3053\u306e\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u306e\u304b\u3001\u305d\u306e\u4ed5\u7d44\u307f\u3068\u89e3\u6c7a\u7b56\u3092\u5b9f\u4f8b\u3068\u3068\u3082\u306b\u89e3\u8aac\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\" style=\"height:28rem\"><\/ul>\r\n<ins class=\"tocBtn is-fixed\" data-toc-id=\"js-tocBWGD\"><\/ins>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n<hr class=\"rule-hory mt-3r\">\r\n\r\n<h2 class=\"fz-xl\">1. will-change\u3068transform: translateZ(0)\u306e\u57fa\u672c<\/h2>\r\n<h3 class=\"fz-ml\">will-change\u3068\u306f<\/h3>\r\n<p><code>will-change<\/code>\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u306b\u300c\u3053\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u304c\u8fd1\u3044\u3046\u3061\u306b\u5909\u66f4\u3055\u308c\u308b\u300d\u3068\u4e8b\u524d\u306b\u4f1d\u3048\u308bCSS\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002<\/p>\r\n<pre><code class=\"language-css\">.element {\r\n  will-change: transform, opacity;\r\n}\r\n<\/code><\/pre>\r\n<p><b class=\"bold\">\u76ee\u7684:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u30d6\u30e9\u30a6\u30b6\u304c\u6700\u9069\u5316\u306e\u6e96\u5099\u3092\u3059\u308b<\/li>\r\n  <li>GPU\u30a2\u30af\u30bb\u30e9\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u6709\u52b9\u5316<\/li>\r\n  <li>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u5411\u4e0a<\/li>\r\n<\/ul>\r\n<h3 class=\"fz-ml\">transform: translateZ(0)\u3068\u306f<\/h3>\r\n<p>3D transform\u306e\u4e00\u7a2e\u3067\u3001Z\u8ef8\u65b9\u5411\u306b0px\u79fb\u52d5\u3059\u308b\uff08\u3064\u307e\u308a\u898b\u305f\u76ee\u306f\u5909\u308f\u3089\u306a\u3044\uff09\u6307\u5b9a\u3067\u3059\u3002<\/p>\r\n<pre><code class=\"language-css\">.element {\r\n  transform: translateZ(0);\r\n}\r\n<\/code><\/pre>\r\n<p><b class=\"bold\">\u76ee\u7684:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u5f37\u5236\u7684\u306bGPU\u30ec\u30a4\u30e4\u30fc\u3092\u4f5c\u6210<\/li>\r\n  <li>\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u30a2\u30af\u30bb\u30e9\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u6709\u52b9\u5316<\/li>\r\n  <li>\u3044\u308f\u3086\u308b\u300c\u30cf\u30c3\u30af\u300d\u3068\u3057\u3066\u4f7f\u308f\u308c\u3066\u304d\u305f<\/li>\r\n<\/ul>\r\n<h3 class=\"fz-ml\">\u985e\u4f3c\u306e\u30d7\u30ed\u30d1\u30c6\u30a3<\/h3>\r\n<p>\u4ee5\u4e0b\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3082\u540c\u69d8\u306e\u52b9\u679c\uff08\u3068\u526f\u4f5c\u7528\uff09\u304c\u3042\u308a\u307e\u3059:<\/p>\r\n<pre><code class=\"language-css\">\/* GPU\u30a2\u30af\u30bb\u30e9\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u6709\u52b9\u306b\u3059\u308b\u30d7\u30ed\u30d1\u30c6\u30a3 *\/\r\ntransform: translate3d(0, 0, 0);\r\ntransform: perspective(1px);\r\nbackface-visibility: hidden;\r\n<\/code><\/pre>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h2 class=\"fz-xl\">2. \u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3068\u306f<\/h2>\r\n<h3 class=\"fz-ml\">\u57fa\u672c\u6982\u5ff5<\/h3>\r\n<p><b class=\"bold\">\u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8<\/b>\u3068\u306f\u3001\u8981\u7d20\u306e\u91cd\u306a\u308a\u9806\u5e8f\u3092\u6c7a\u5b9a\u3059\u308b3D\u7a7a\u9593\u306e\u3088\u3046\u306a\u6982\u5ff5\u3067\u3059\u3002\u65b0\u3057\u3044\u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u304c\u4f5c\u6210\u3055\u308c\u308b\u3068\u3001\u305d\u306e\u4e2d\u306e\u8981\u7d20\u306f\u72ec\u7acb\u3057\u305f\u300c\u5c64\u300d\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u3002<\/p>\r\n<h3 class=\"fz-ml\">\u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u4f5c\u6210\u3059\u308b\u6761\u4ef6<\/h3>\r\n<p>\u4ee5\u4e0b\u306e\u3044\u305a\u308c\u304b\u3092\u6301\u3064\u8981\u7d20\u306f\u3001\u65b0\u3057\u3044\u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u4f5c\u6210\u3057\u307e\u3059:<\/p>\r\n<ol style=\"list-style-type:decimal;\">\r\n  <li>\r\n    <p><b class=\"bold\">position\u304crelative\/absolute\/fixed \u3067 z-index\u304c auto\u4ee5\u5916<\/b><\/p>\r\n    <pre><code class=\"language-css\">.element {\r\n  position: relative;\r\n  z-index: 1; \/* \u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u4f5c\u6210 *\/\r\n}\r\n<\/code><\/pre>\r\n  <\/li>\r\n  <li>\r\n    <p><b class=\"bold\">transform\u30d7\u30ed\u30d1\u30c6\u30a3\uff08none\u4ee5\u5916\uff09<\/b><\/p>\r\n    <pre><code class=\"language-css\">.element {\r\n  transform: translateZ(0); \/* \u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u4f5c\u6210 *\/\r\n}\r\n<\/code><\/pre>\r\n  <\/li>\r\n  <li>\r\n    <p><b class=\"bold\">will-change \u3067 transform, opacity\u7b49\u3092\u6307\u5b9a<\/b><\/p>\r\n    <pre><code class=\"language-css\">.element {\r\n  will-change: transform; \/* \u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u4f5c\u6210 *\/\r\n}\r\n<\/code><\/pre>\r\n  <\/li>\r\n  <li>\r\n    <p><b class=\"bold\">\u305d\u306e\u4ed6<\/b><\/p>\r\n    <ul style=\"list-style-type:bullet;\">\r\n      <li><code>opacity<\/code>\u304c1\u672a\u6e80<\/li>\r\n      <li><code>filter<\/code>, <code>backdrop-filter<\/code>, <code>clip-path<\/code>\u7b49<\/li>\r\n      <li><code>isolation: isolate<\/code><\/li>\r\n      <li><code>contain: layout, paint, strict, content<\/code><\/li>\r\n    <\/ul>\r\n  <\/li>\r\n<\/ol>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h2 class=\"fz-xl\">3. position: fixed\u304c\u58ca\u308c\u308b\u7406\u7531<\/h2>\r\n<h3 class=\"fz-ml\">\u901a\u5e38\u306eposition: fixed\u306e\u52d5\u4f5c<\/h3>\r\n<p><code>position: fixed<\/code>\u306f\u901a\u5e38\u3001<b class=\"bold\">\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\uff08\u753b\u9762\u5168\u4f53\uff09\u3092\u57fa\u6e96<\/b>\u306b\u914d\u7f6e\u3055\u308c\u307e\u3059\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;div class=&quot;parent&quot;&gt;\r\n  &lt;div class=&quot;fixed-child&quot;&gt;\r\n    \u56fa\u5b9a\u8981\u7d20\uff08\u753b\u9762\u306b\u5bfe\u3057\u3066\u56fa\u5b9a\uff09\r\n  &lt;\/div&gt;\r\n&lt;\/div&gt;\r\n<\/code><\/pre>\r\n<pre><code class=\"language-css\">.fixed-child {\r\n  position: fixed;\r\n  top: 0;\r\n  right: 0;\r\n  \/* \u901a\u5e38\u306f\u753b\u9762\u53f3\u4e0a\u306b\u56fa\u5b9a\u3055\u308c\u308b *\/\r\n}\r\n<\/code><\/pre>\r\n<h3 class=\"fz-ml\">transform\u3084will-change\u304c\u3042\u308b\u5834\u5408<\/h3>\r\n<p><b class=\"bold\">\u89aa\u8981\u7d20\u306b<code>transform<\/code>\u3084<code>will-change: transform<\/code>\u304c\u3042\u308b\u5834\u5408\u3001<code>position: fixed<\/code>\u306e\u57fa\u6e96\u70b9\u304c\u5909\u308f\u308a\u307e\u3059\u3002<\/b><\/p>\r\n<pre><code class=\"language-css\">.parent {\r\n  transform: translateZ(0); \/* \u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u4f5c\u6210 *\/\r\n}\r\n\r\n.fixed-child {\r\n  position: fixed;\r\n  top: 0;\r\n  right: 0;\r\n  \/* \u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u3067\u306f\u306a\u304f.parent\u3092\u57fa\u6e96\u306b\u914d\u7f6e\u3055\u308c\u308b\uff01 *\/\r\n}\r\n<\/code><\/pre>\r\n<h3 class=\"fz-ml\">\u306a\u305c\u3053\u3046\u306a\u308b\u306e\u304b<\/h3>\r\n<p>CSS\u4ed5\u69d8\uff08CSS Transforms Module\uff09\u306b\u3088\u308b\u3068:<\/p>\r\n<blockquote class=\"mt-0.75r\">\r\n  <p>&quot;For elements whose layout is governed by the CSS box model, any value other than none for the transform also causes the element to establish a containing block for all descendants.&quot;<\/p>\r\n<\/blockquote>\r\n<p><b class=\"bold\">\u8a33:<\/b><br \/>\r\n  transform\u306bnone\u4ee5\u5916\u306e\u5024\u3092\u6307\u5b9a\u3059\u308b\u3068\u3001\u305d\u306e\u8981\u7d20\u306f\u3059\u3079\u3066\u306e\u5b50\u5b6b\u8981\u7d20\u306b\u5bfe\u3057\u3066\u300c\u5305\u542b\u30d6\u30ed\u30c3\u30af\uff08containing block\uff09\u300d\u3068\u306a\u308b\u3002<\/p>\r\n<p>\u3064\u307e\u308a\u3001<b class=\"bold\"><code>position: fixed<\/code>\u306e\u57fa\u6e96\u70b9\u304c\u3001\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u304b\u3089\u89aa\u8981\u7d20\u306b\u5909\u66f4\u3055\u308c\u308b<\/b>\u306e\u3067\u3059\u3002<\/p>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h2 class=\"fz-xl\">4. \u5b9f\u969b\u306b\u8d77\u304d\u308b\u554f\u984c\u306e\u30c7\u30e2<\/h2>\r\n<h3 class=\"fz-ml\">\u30b1\u30fc\u30b9\u30b9\u30bf\u30c7\u30a3: \u80cc\u666f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3 + \u56fa\u5b9a\u30d8\u30c3\u30c0\u30fc<\/h3>\r\n<p>\u3088\u304f\u3042\u308b\u30b7\u30ca\u30ea\u30aa\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;div class=&quot;background-animation&quot;&gt;\r\n  &lt;!-- \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u80cc\u666f --&gt;\r\n  &lt;header class=&quot;fixed-header&quot;&gt;\r\n    \u56fa\u5b9a\u30d8\u30c3\u30c0\u30fc\r\n  &lt;\/header&gt;\r\n  &lt;main&gt;\r\n    \u30e1\u30a4\u30f3\u30b3\u30f3\u30c6\u30f3\u30c4\r\n  &lt;\/main&gt;\r\n&lt;\/div&gt;\r\n<\/code><\/pre>\r\n<h4 class=\"fz-md\">\u554f\u984c\u304c\u8d77\u304d\u308b\u30b3\u30fc\u30c9<\/h4>\r\n<pre><code class=\"language-css\">\/* \u80cc\u666f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u7528\u306e\u6700\u9069\u5316 *\/\r\n.background-animation {\r\n  position: relative;\r\n  background: linear-gradient(45deg, #667eea 0%, #764ba2 100%);\r\n  animation: gradientShift 10s infinite;\r\n  \r\n  \/* \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u3064\u3082\u308a\u3067\u8ffd\u52a0 *\/\r\n  will-change: background-position;\r\n  transform: translateZ(0); \/* \u2190 \u3053\u308c\u304c\u539f\u56e0\uff01 *\/\r\n}\r\n\r\n\/* \u56fa\u5b9a\u30d8\u30c3\u30c0\u30fc *\/\r\n.fixed-header {\r\n  position: fixed;\r\n  top: 0;\r\n  left: 0;\r\n  right: 0;\r\n  background: rgba(255, 255, 255, 0.9);\r\n  z-index: 100;\r\n  \/* \u30b9\u30af\u30ed\u30fc\u30eb\u3057\u3066\u3082.background-animation\u306e\u4e0a\u90e8\u306b\u8cbc\u308a\u4ed8\u304f\r\n     \uff08\u672c\u6765\u306f\u753b\u9762\u4e0a\u90e8\u306b\u56fa\u5b9a\u3055\u308c\u308b\u3079\u304d\uff09 *\/\r\n}\r\n<\/code><\/pre>\r\n<p><b class=\"bold\">\u7d50\u679c:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u30d8\u30c3\u30c0\u30fc\u304c\u753b\u9762\u306b\u56fa\u5b9a\u3055\u308c\u306a\u3044<\/li>\r\n  <li>\u30b9\u30af\u30ed\u30fc\u30eb\u3059\u308b\u3068\u4e00\u7dd2\u306b\u52d5\u3044\u3066\u3057\u307e\u3046<\/li>\r\n  <li><code>z-index<\/code>\u3092\u4e0a\u3052\u3066\u3082\u89e3\u6c7a\u3057\u306a\u3044<\/li>\r\n<\/ul>\r\n<h3 class=\"fz-ml\">z-index\u304c\u52b9\u304b\u306a\u3044\u554f\u984c<\/h3>\r\n<p>\u3055\u3089\u306b\u3001<code>z-index: -1<\/code>\u3092::before\u3084::after\u306b\u6307\u5b9a\u3057\u3066\u3044\u308b\u5834\u5408\u3082\u554f\u984c\u304c\u8907\u96d1\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\r\n<pre><code class=\"language-css\">.background-animation::before {\r\n  content: &#39;&#39;;\r\n  position: absolute;\r\n  z-index: -1; \/* \u80cc\u666f\u3092\u5f8c\u308d\u306b\u914d\u7f6e\u3057\u305f\u3044\u3060\u3051\u306a\u306e\u306b... *\/\r\n  \/* \u3053\u308c\u3082\u65b0\u3057\u3044\u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u5f71\u97ff\u3059\u308b *\/\r\n}\r\n<\/code><\/pre>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h2 class=\"fz-xl\">5. \u89e3\u6c7a\u7b56\u3068\u4ee3\u66ff\u624b\u6cd5<\/h2>\r\n<h3 class=\"fz-ml\">\u89e3\u6c7a\u7b561: will-change\u3068transform\u3092\u524a\u9664<\/h3>\r\n<p>\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u89e3\u6c7a\u6cd5\u306f\u3001\u554f\u984c\u306e\u539f\u56e0\u3092\u53d6\u308a\u9664\u304f\u3053\u3068\u3067\u3059\u3002<\/p>\r\n<pre><code class=\"language-css\">.background-animation {\r\n  position: relative;\r\n  background: linear-gradient(45deg, #667eea 0%, #764ba2 100%);\r\n  animation: gradientShift 10s infinite;\r\n  \r\n  \/* will-change\u3068transform\u3092\u524a\u9664 *\/\r\n  \/* will-change: background-position; *\/\r\n  \/* transform: translateZ(0); *\/\r\n}\r\n<\/code><\/pre>\r\n<p><b class=\"bold\">\u30e1\u30ea\u30c3\u30c8:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>position: fixed\u304c\u6b63\u5e38\u306b\u52d5\u4f5c<\/li>\r\n  <li>\u30b3\u30fc\u30c9\u304c\u30b7\u30f3\u30d7\u30eb<\/li>\r\n<\/ul>\r\n<p><b class=\"bold\">\u30c7\u30e1\u30ea\u30c3\u30c8:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u8907\u96d1\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3067\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u843d\u3061\u308b\u53ef\u80fd\u6027<\/li>\r\n<\/ul>\r\n<h3 class=\"fz-ml\">\u89e3\u6c7a\u7b562: \u7591\u4f3c\u8981\u7d20\u306b\u6700\u9069\u5316\u3092\u79fb\u52d5<\/h3>\r\n<p>\u89aa\u8981\u7d20\u304b\u3089<code>will-change<\/code>\u3068<code>transform<\/code>\u3092\u524a\u9664\u3057\u3001\u4ee3\u308f\u308a\u306b<code>::before<\/code>\u3084<code>::after<\/code>\u306b\u9069\u7528\u3057\u307e\u3059\u3002<\/p>\r\n<p><b class=\"bold\">\u7591\u4f3c\u8981\u7d20\u306f\u5b50\u8981\u7d20\u306b\u5f71\u97ff\u3057\u307e\u305b\u3093\u3002<\/b><\/p>\r\n<pre><code class=\"language-css\">.background-animation {\r\n  position: relative;\r\n  \/* will-change\u3068transform\u306f\u524a\u9664 *\/\r\n}\r\n\r\n\/* \u7591\u4f3c\u8981\u7d20\u3067\u80cc\u666f\u30a8\u30d5\u30a7\u30af\u30c8\u3092\u4f5c\u6210 *\/\r\n.background-animation::before {\r\n  content: &#39;&#39;;\r\n  position: absolute;\r\n  top: 0;\r\n  left: 0;\r\n  width: 100%;\r\n  height: 100%;\r\n  z-index: -1;\r\n  background: linear-gradient(45deg, #667eea 0%, #764ba2 100%);\r\n  animation: gradientShift 10s infinite;\r\n  \r\n  \/* \u7591\u4f3c\u8981\u7d20\u306b\u306e\u307f\u6700\u9069\u5316\u3092\u9069\u7528 *\/\r\n  will-change: transform, opacity;\r\n  transform: translateZ(0);\r\n}\r\n\r\n.fixed-header {\r\n  position: fixed;\r\n  top: 0;\r\n  \/* \u6b63\u5e38\u306b\u52d5\u4f5c\u3059\u308b\uff01 *\/\r\n}\r\n<\/code><\/pre>\r\n<p><b class=\"bold\">\u30e1\u30ea\u30c3\u30c8:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u3092\u7dad\u6301<\/li>\r\n  <li>position: fixed\u304c\u6b63\u5e38\u306b\u52d5\u4f5c<\/li>\r\n  <li>\u69cb\u9020\u304c\u660e\u78ba<\/li>\r\n<\/ul>\r\n<p><b class=\"bold\">\u30c7\u30e1\u30ea\u30c3\u30c8:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>HTML\u306e\u69cb\u9020\u5909\u66f4\u304c\u5fc5\u8981\u306a\u5834\u5408\u304c\u3042\u308b<\/li>\r\n<\/ul>\r\n<h3 class=\"fz-ml\">\u89e3\u6c7a\u7b563: HTML\u69cb\u9020\u3092\u5909\u66f4<\/h3>\r\n<p>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u8981\u7d20\u3068\u56fa\u5b9a\u8981\u7d20\u3092\u5225\u306e\u89aa\u8981\u7d20\u306b\u5206\u3051\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\r\n<pre><code class=\"language-html\">&lt;!-- \u80cc\u666f\u30ec\u30a4\u30e4\u30fc --&gt;\r\n&lt;div class=&quot;background-layer&quot;&gt;\r\n  &lt;!-- \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u80cc\u666f --&gt;\r\n&lt;\/div&gt;\r\n\r\n&lt;!-- \u30b3\u30f3\u30c6\u30f3\u30c4\u30ec\u30a4\u30e4\u30fc --&gt;\r\n&lt;div class=&quot;content-layer&quot;&gt;\r\n  &lt;header class=&quot;fixed-header&quot;&gt;\r\n    \u56fa\u5b9a\u30d8\u30c3\u30c0\u30fc\r\n  &lt;\/header&gt;\r\n  &lt;main&gt;\r\n    \u30e1\u30a4\u30f3\u30b3\u30f3\u30c6\u30f3\u30c4\r\n  &lt;\/main&gt;\r\n&lt;\/div&gt;\r\n<\/code><\/pre>\r\n<pre><code class=\"language-css\">.background-layer {\r\n  position: fixed;\r\n  top: 0;\r\n  left: 0;\r\n  width: 100%;\r\n  height: 100%;\r\n  z-index: -1;\r\n  background: linear-gradient(45deg, #667eea 0%, #764ba2 100%);\r\n  animation: gradientShift 10s infinite;\r\n  \r\n  \/* \u3053\u3053\u3067\u306f\u6700\u9069\u5316OK *\/\r\n  will-change: background-position;\r\n  transform: translateZ(0);\r\n}\r\n\r\n.content-layer {\r\n  position: relative;\r\n  z-index: 1;\r\n  \/* will-change\u3068transform\u306a\u3057 *\/\r\n}\r\n\r\n.fixed-header {\r\n  position: fixed;\r\n  top: 0;\r\n  \/* \u6b63\u5e38\u306b\u52d5\u4f5c\u3059\u308b\uff01 *\/\r\n}\r\n<\/code><\/pre>\r\n<p><b class=\"bold\">\u30e1\u30ea\u30c3\u30c8:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u6700\u3082\u78ba\u5b9f<\/li>\r\n  <li>\u30ec\u30a4\u30e4\u30fc\u69cb\u9020\u304c\u660e\u78ba<\/li>\r\n<\/ul>\r\n<p><b class=\"bold\">\u30c7\u30e1\u30ea\u30c3\u30c8:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>HTML\u306e\u5909\u66f4\u304c\u5fc5\u8981<\/li>\r\n  <li>\u8981\u7d20\u304c\u5897\u3048\u308b<\/li>\r\n<\/ul>\r\n<hr class=\"rule-hory mt-3r\">\r\n<h2 class=\"fz-xl\">6. \u3044\u3064\u4f7f\u3046\u3079\u304d\u304b\u3001\u3044\u3064\u907f\u3051\u308b\u3079\u304d\u304b<\/h2>\r\n<h3 class=\"fz-ml\">will-change\u3092\u4f7f\u3046\u3079\u304d\u5834\u5408<\/h3>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u30e6\u30fc\u30b6\u30fc\u306e\u30a4\u30f3\u30bf\u30e9\u30af\u30b7\u30e7\u30f3\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u958b\u59cb\u3059\u308b\u76f4\u524d<\/li>\r\n  <li>\u8907\u96d1\u306atransform\u3084opacity\u306e\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3<\/li>\r\n  <li>60fps\u3092\u7dad\u6301\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408<\/li>\r\n<\/ul>\r\n<pre><code class=\"language-css\">.button {\r\n  transition: transform 0.3s;\r\n}\r\n\r\n.button:hover,\r\n.button:focus {\r\n  will-change: transform;\r\n  \/* \u30db\u30d0\u30fc\u6642\u306e\u307f\u6709\u52b9\u5316 *\/\r\n}\r\n\r\n.button:not(:hover):not(:focus) {\r\n  will-change: auto;\r\n  \/* \u4f7f\u308f\u306a\u3044\u6642\u306f\u89e3\u9664 *\/\r\n}\r\n<\/code><\/pre>\r\n<h3 class=\"fz-ml\">will-change\u3092\u907f\u3051\u308b\u3079\u304d\u5834\u5408<\/h3>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u3059\u3079\u3066\u306e\u8981\u7d20\u306b\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u9069\u7528<\/li>\r\n  <li>\u5b50\u8981\u7d20\u306bposition: fixed\u304c\u3042\u308b\u89aa\u8981\u7d20<\/li>\r\n  <li>\u30b7\u30f3\u30d7\u30eb\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\uff08color\u3084background-color\u306a\u3069\uff09<\/li>\r\n<\/ul>\r\n<pre><code class=\"language-css\">\/* \u60aa\u3044\u4f8b *\/\r\n* {\r\n  will-change: transform, opacity;\r\n  \/* \u30e1\u30e2\u30ea\u3092\u5927\u91cf\u6d88\u8cbb *\/\r\n}\r\n<\/code><\/pre>\r\n<h3 class=\"fz-ml\">transform: translateZ(0)\u3092\u4f7f\u3046\u3079\u304d\u5834\u5408<\/h3>\r\n<p>\u2705 <b class=\"bold\">\u4f7f\u3046\u3079\u304d:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>\u7591\u4f3c\u8981\u7d20\uff08::before, ::after\uff09<\/li>\r\n  <li>position: fixed\u306e\u5b50\u8981\u7d20\u304c\u306a\u3044\u5834\u5408<\/li>\r\n  <li>\u30ec\u30ac\u30b7\u30fc\u30d6\u30e9\u30a6\u30b6\u5bfe\u5fdc\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\r\n<\/ul>\r\n<p>\u274c <b class=\"bold\">\u907f\u3051\u308b\u3079\u304d:<\/b><\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li>position: fixed\u306e\u5b50\u8981\u7d20\u304c\u3042\u308b\u89aa\u8981\u7d20<\/li>\r\n  <li>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u5341\u5206\u306a\u5834\u5408<\/li>\r\n  <li>\u30e2\u30c0\u30f3\u30d6\u30e9\u30a6\u30b6\u306e\u307f\u3092\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u3059\u308b\u5834\u5408<\/li>\r\n<\/ul>\r\n\r\n<hr class=\"rule-hory mt-3r\">\r\n\r\n\r\n<h2 class=\"fz-xl\">7. \u307e\u3068\u3081<\/h2>\r\n<h3 class=\"fz-ml\">\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8<\/h3>\r\n<ol style=\"list-style-type:decimal;\">\r\n  <li>\r\n    <p><b class=\"bold\"><code>will-change<\/code>\u3068<code>transform<\/code>\u306f\u65b0\u3057\u3044\u30b9\u30bf\u30c3\u30ad\u30f3\u30b0\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u4f5c\u6210\u3059\u308b<\/b><\/p>\r\n    <ul style=\"list-style-type:bullet;\">\r\n      <li>\u3053\u308c\u306b\u3088\u308a\u3001\u5b50\u8981\u7d20\u306e<code>position: fixed<\/code>\u306e\u57fa\u6e96\u70b9\u304c\u5909\u308f\u308b<\/li>\r\n    <\/ul>\r\n  <\/li>\r\n  <li>\r\n    <p><b class=\"bold\">\u7591\u4f3c\u8981\u7d20\uff08::before, ::after\uff09\u306f\u5b50\u8981\u7d20\u306b\u5f71\u97ff\u3057\u306a\u3044<\/b><\/p>\r\n    <ul style=\"list-style-type:bullet;\">\r\n      <li>\u6700\u9069\u5316\u3092\u3053\u3053\u306b\u79fb\u52d5\u3059\u308b\u306e\u304c\u52b9\u679c\u7684<\/li>\r\n    <\/ul>\r\n  <\/li>\r\n  <li>\r\n    <p><b class=\"bold\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306f\u5fc5\u8981\u306a\u6642\u3060\u3051<\/b><\/p>\r\n    <ul style=\"list-style-type:bullet;\">\r\n      <li>\u300c\u3068\u308a\u3042\u3048\u305a\u300d\u3067<code>will-change<\/code>\u3092\u4f7f\u3046\u306e\u306f\u907f\u3051\u308b<\/li>\r\n    <\/ul>\r\n  <\/li>\r\n  <li>\r\n    <p><b class=\"bold\">\u554f\u984c\u304c\u8d77\u304d\u305f\u3089\u69cb\u9020\u3092\u898b\u76f4\u3059<\/b><\/p>\r\n    <ul style=\"list-style-type:bullet;\">\r\n      <li>HTML\/CSS\u306e\u69cb\u9020\u3092\u5909\u66f4\u3059\u308b\u3053\u3068\u3067\u6839\u672c\u7684\u306b\u89e3\u6c7a<\/li>\r\n    <\/ul>\r\n  <\/li>\r\n<\/ol>\r\n\r\n<h3 class=\"fz-ml\">\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h3>\r\n<p>\u4ee5\u4e0b\u306e\u6761\u4ef6\u306b\u5f53\u3066\u306f\u307e\u308b\u5834\u5408\u306f\u6ce8\u610f:<\/p>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li><input disabled=\"\" type=\"checkbox\"> \u89aa\u8981\u7d20\u306b<code>will-change: transform<\/code>\u304c\u3042\u308b<\/li>\r\n  <li><input disabled=\"\" type=\"checkbox\"> \u89aa\u8981\u7d20\u306b<code>transform: translateZ(0)<\/code>\u3084<code>translate3d(0,0,0)<\/code>\u304c\u3042\u308b<\/li>\r\n  <li><input disabled=\"\" type=\"checkbox\"> \u5b50\u8981\u7d20\u3067<code>position: fixed<\/code>\u3092\u4f7f\u3063\u3066\u3044\u308b<\/li>\r\n  <li><input disabled=\"\" type=\"checkbox\"> \u56fa\u5b9a\u8981\u7d20\u304c\u753b\u9762\u3067\u306f\u306a\u304f\u89aa\u8981\u7d20\u3092\u57fa\u6e96\u306b\u914d\u7f6e\u3055\u308c\u3066\u3044\u308b<\/li>\r\n  <li><input disabled=\"\" type=\"checkbox\"> <code>z-index<\/code>\u3092\u4e0a\u3052\u3066\u3082\u89e3\u6c7a\u3057\u306a\u3044<\/li>\r\n<\/ul>\r\n\r\n<h3 class=\"fz-ml\">\u53c2\u8003\u30ea\u30bd\u30fc\u30b9<\/h3>\r\n<ul style=\"list-style-type:bullet;\">\r\n  <li><cite><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/CSS\/will-change\" class=\"link\" target=\"_blank\">MDN: will-change<\/a><\/cite><\/li>\r\n  <li><cite><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/CSS\/transform\" class=\"link\" target=\"_blank\">MDN: transform<\/a><\/cite><\/li>\r\n  <li><cite><a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/CSS\/CSS_positioned_layout\/Understanding_z-index\/Stacking_context\" class=\"link\">MDN: Stacking context<\/a><\/cite><\/li>\r\n  <li><cite><a href=\"https:\/\/www.w3.org\/TR\/css-transforms-1\/\" class=\"link\" target=\"_blank\">CSS Transforms Module Level 1<\/a><\/cite><\/li>\r\n<\/ul>\r\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306f\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u304c\u3001\u526f\u4f5c\u7528\u3092\u7406\u89e3\u3057\u3066\u4f7f\u3046\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>","protected":false},"excerpt":{"rendered":"CSS\u306ewill-change\u3084transform: 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