{"id":18763,"date":"2026-07-21T11:36:36","date_gmt":"2026-07-21T11:36:36","guid":{"rendered":"https:\/\/withcode.tech\/media\/?p=18763"},"modified":"2026-07-21T11:36:36","modified_gmt":"2026-07-21T11:36:36","slug":"css-fadein-scroll","status":"publish","type":"post","link":"https:\/\/withcode.tech\/media\/css-fadein-scroll\/","title":{"rendered":"CSS\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u306e\u5b9f\u88c5\u65b9\u6cd5\uff5c\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u8981\u7d20\u3092\u3075\u308f\u3063\u3068\u8868\u793a\u3059\u308b\uff08JS\u6700\u5c0f\uff09"},"content":{"rendered":"<p class=\"wp-block-paragraph\">\u300c\u30dc\u30bf\u30f3\u3092\u62bc\u3057\u305f\u308f\u3051\u3067\u3082\u306a\u3044\u306e\u306b\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u3059\u308b\u3060\u3051\u3067\u8981\u7d20\u304c\u3075\u308f\u3063\u3068\u73fe\u308c\u308b\u300d\u2014\u2014\u3042\u306e\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3001\u6c17\u306b\u306a\u3063\u305f\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u304b\uff1f\u3042\u308c\u304c <code>CSS\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3<\/code> \u3067\u3059\u3002\u5b9f\u88c5\u306e\u4ed5\u65b9\u306b\u3088\u3063\u3066\u300c\u30da\u30fc\u30b8\u3092\u958b\u3044\u305f\u77ac\u9593\u306b\u8868\u793a\u3055\u308c\u308b\u300d\u30d1\u30bf\u30fc\u30f3\u3068\u300c\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u3066\u753b\u9762\u306b\u5165\u3063\u305f\u3089\u73fe\u308c\u308b\u300d\u30d1\u30bf\u30fc\u30f3\u306e2\u7a2e\u985e\u304c\u3042\u308a\u3001\u305d\u308c\u305e\u308c\u7528\u9014\u304c\u7570\u306a\u308a\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\">CSS\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u306f <code>opacity<\/code>\uff08\u900f\u660e\u5ea6\uff09\u3092 <code>0<\/code> \u304b\u3089 <code>1<\/code> \u306b\u5909\u5316\u3055\u305b\u308b\u3053\u3068\u3067\u5b9f\u73fe\u3057\u307e\u3059\u3002\u305f\u3063\u305f\u6570\u884c\u306e\u30b3\u30fc\u30c9\u3067\u8996\u899a\u7684\u306a\u6ed1\u3089\u304b\u3055\u304c\u751f\u307e\u308c\u3001\u30da\u30fc\u30b8\u5168\u4f53\u306e\u5370\u8c61\u304c\u30d7\u30ed\u3063\u307d\u304f\u306a\u308a\u307e\u3059\u3002\u6700\u8fd1\u3067\u306fJavaScript\u3092\u307b\u307c\u66f8\u304b\u305a\u306b\u5b9f\u73fe\u3067\u304d\u308b\u65b9\u6cd5\u3082\u5897\u3048\u3066\u304a\u308a\u3001\u521d\u5fc3\u8005\u3067\u3082\u53d6\u308a\u7d44\u307f\u3084\u3059\u3044\u6280\u8853\u306b\u306a\u3063\u3066\u304d\u307e\u3057\u305f\u3002<\/p><p class=\"wp-block-paragraph\">\u3053\u306e\u8a18\u4e8b\u3067\u306f\u57fa\u672c\u7684\u306a <code>@keyframes<\/code> \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u9023\u52d5\u3001\u65b9\u5411\u4ed8\u304d\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3001\u6642\u9593\u5dee\u3067\u8907\u6570\u8981\u7d20\u3092\u8868\u793a\u3059\u308b\u65b9\u6cd5\u3001\u3055\u3089\u306bCSS\u3060\u3051\u3067\u5b9f\u73fe\u3059\u308b\u6700\u65b0\u624b\u6cd5\u307e\u3067\u9806\u3092\u8ffd\u3063\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002\u30b3\u30fc\u30c9\u3092\u30b3\u30d4\u30fc\u3057\u3066\u305d\u306e\u307e\u307e\u4f7f\u3048\u308b\u3088\u3046\u306b\u8a2d\u8a08\u3057\u3066\u3044\u308b\u306e\u3067\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u3059\u3050\u6d3b\u304b\u305b\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\">\u307e\u305a\u306f\u3053\u306e\u8a18\u4e8b\u3067\u5b66\u3079\u308b\u3053\u3068\u3092\u307e\u3068\u3081\u3066\u304a\u304d\u307e\u3059\u3002<\/p><ul class=\"wp-block-list\"><li><strong>\u30da\u30fc\u30b8\u8aad\u8fbc\u6642\u306b\u3075\u308f\u3063\u3068\u8868\u793a<\/strong>\uff1a<code>@keyframes<\/code> \u3084 <code>transition<\/code> \u3092\u4f7f\u3063\u3066\u3001\u30da\u30fc\u30b8\u3092\u958b\u3044\u305f\u77ac\u9593\u306b\u8981\u7d20\u304c\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3059\u308b\u65b9\u6cd5<\/li><li><strong>\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u753b\u9762\u306b\u5165\u3063\u305f\u3089\u8868\u793a<\/strong>\uff1aIntersection Observer API \u3092\u4f7f\u3063\u3066\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u898b\u3048\u3066\u304d\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u8981\u7d20\u3092\u8868\u793a\u3059\u308b\u65b9\u6cd5<\/li><li><strong>\u65b9\u5411\u30fb\u6642\u9593\u5dee\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3<\/strong>\uff1a\u4e0b\u304b\u3089\u30fb\u5de6\u304b\u3089\u30fb\u53f3\u304b\u3089\u306e\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3084\u3001\u8907\u6570\u8981\u7d20\u3092\u9806\u756a\u306b\u8868\u793a\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/li><li><strong>\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u5bfe\u5fdc<\/strong>\uff1a\u52d5\u304d\u304c\u82e6\u624b\u306a\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u914d\u616e\u3068\u3001\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u304c\u52b9\u304b\u306a\u3044\u3068\u304d\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/li><\/ul><h2 class=\"wp-block-heading\">\u30da\u30fc\u30b8\u8aad\u8fbc\u6642\u306e\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\uff08@keyframes\u3067\u5b9f\u88c5\uff09<\/h2><p class=\"wp-block-paragraph\">\u30da\u30fc\u30b8\u3092\u958b\u3044\u305f\u77ac\u9593\u306b\u8981\u7d20\u304c\u3075\u308f\u3063\u3068\u8868\u793a\u3055\u308c\u308b\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u65b9\u6cd5\u306f <code>@keyframes<\/code> \u3092\u4f7f\u3063\u3066\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u5b9a\u7fa9\u3057\u3001\u5bfe\u8c61\u8981\u7d20\u306b <code>animation<\/code> \u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3059\u3002JavaScript\u306f\u4e00\u5207\u4e0d\u8981\u3067\u3001CSS\u3060\u3051\u3067\u5b8c\u7d50\u3057\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\"><code>opacity<\/code> \u306f\u8981\u7d20\u306e\u900f\u660e\u5ea6\u3092\u5236\u5fa1\u3059\u308b\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002<code>0<\/code> \u304c\u5b8c\u5168\u306b\u900f\u660e\u3001<code>1<\/code> \u304c\u5b8c\u5168\u306b\u4e0d\u900f\u660e\u306b\u306a\u308a\u307e\u3059\u3002<code>@keyframes<\/code> \u306e <code>from<\/code>\uff08\u958b\u59cb\u72b6\u614b\uff09\u306b <code>opacity: 0<\/code>\u3001<code>to<\/code>\uff08\u7d42\u4e86\u72b6\u614b\uff09\u306b <code>opacity: 1<\/code> \u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u900f\u660e\u304b\u3089\u4e0d\u900f\u660e\u3078\u306e\u5909\u5316\u304c\u751f\u307e\u308c\u307e\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u5b9a\u7fa9 *\/\n@keyframes fadeIn {\n  from {\n    opacity: 0;\n  }\n  to {\n    opacity: 1;\n  }\n}\n\n\/* \u8981\u7d20\u306b\u9069\u7528 *\/\n.fade-in {\n  animation: fadeIn 1s ease forwards;\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\"><code>animation<\/code> \u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u306f\u300c\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u540d\u30fb\u518d\u751f\u6642\u9593\u30fb\u30a4\u30fc\u30b8\u30f3\u30b0\u30fb\u7d42\u4e86\u5f8c\u306e\u72b6\u614b\u300d\u3092\u307e\u3068\u3081\u3066\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002<code>forwards<\/code> \u306f\u300c\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u7d42\u4e86\u5f8c\u3082\u6700\u5f8c\u306e\u72b6\u614b\uff08<code>opacity: 1<\/code>\uff09\u3092\u7dad\u6301\u3059\u308b\u300d\u3068\u3044\u3046\u610f\u5473\u3067\u3059\u3002\u3053\u308c\u3092\u5fd8\u308c\u308b\u3068\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u5b8c\u4e86\u5f8c\u306b\u8981\u7d20\u304c\u6d88\u3048\u3066\u3057\u307e\u3046\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p><h3 class=\"wp-block-heading\">\u9045\u5ef6\uff08delay\uff09\u3092\u52a0\u3048\u3066\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u305a\u3089\u3059<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u9045\u5ef6\u3042\u308a\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3 *\/\n.fade-in-delay {\n  opacity: 0; \/* \u521d\u671f\u72b6\u614b\u306f\u900f\u660e *\/\n  animation: fadeIn 1s ease 0.5s forwards;\n  \/* \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u540d \/ \u6642\u9593 \/ \u30a4\u30fc\u30b8\u30f3\u30b0 \/ \u9045\u5ef6 \/ \u7d42\u4e86\u5f8c\u306e\u72b6\u614b *\/\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\"><code>animation<\/code> \u306e4\u756a\u76ee\u306e\u5024\u304c\u9045\u5ef6\u6642\u9593\u3067\u3059\u3002\u3053\u3053\u3067\u306f <code>0.5s<\/code>\uff080.5\u79d2\u5f8c\uff09\u306b\u518d\u751f\u304c\u59cb\u307e\u308a\u307e\u3059\u3002\u9045\u5ef6\u4e2d\u306f\u521d\u671f\u72b6\u614b\uff08<code>opacity: 0<\/code>\uff09\u306e\u307e\u307e\u306b\u306a\u308b\u306e\u3067\u3001\u8981\u7d20\u306b <code>opacity: 0<\/code> \u3092\u521d\u671f\u5024\u3068\u3057\u3066\u6307\u5b9a\u3057\u3066\u304a\u304f\u3053\u3068\u304c\u5927\u5207\u3067\u3059\u3002<\/p><h3 class=\"wp-block-heading\">HTML\u3068CSS\u3092\u30bb\u30c3\u30c8\u306b\u3057\u305f\u5b8c\u5168\u30b5\u30f3\u30d7\u30eb<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;ja&quot;&gt;\n&lt;head&gt;\n  &lt;meta charset=&quot;UTF-8&quot;&gt;\n  &lt;title&gt;\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u30b5\u30f3\u30d7\u30eb&lt;\/title&gt;\n  &lt;link rel=&quot;stylesheet&quot; href=&quot;style.css&quot;&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n  &lt;h1 class=&quot;fade-in&quot;&gt;\u30bf\u30a4\u30c8\u30eb\u304c\u3075\u308f\u3063\u3068\u8868\u793a\u3055\u308c\u308b&lt;\/h1&gt;\n  &lt;p class=&quot;fade-in-delay&quot;&gt;\u5c11\u3057\u9045\u308c\u3066\u6bb5\u843d\u304c\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3&lt;\/p&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre><\/div><p class=\"wp-block-paragraph\">\u3053\u306e\u69cb\u6210\u304cCSS\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u306e\u6700\u5c0f\u69cb\u6210\u3067\u3059\u3002<code>fade-in<\/code> \u30af\u30e9\u30b9\u3092\u4ed8\u3051\u305f\u8981\u7d20\u306f\u30da\u30fc\u30b8\u8aad\u8fbc\u3068\u540c\u6642\u306b\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u59cb\u307e\u308a\u3001<code>fade-in-delay<\/code> \u30af\u30e9\u30b9\u306e\u8981\u7d20\u306f0.5\u79d2\u9045\u308c\u3066\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3057\u307e\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u30a4\u30fc\u30b8\u30f3\u30b0\u3067\u52d5\u304d\u306e\u8cea\u611f\u3092\u5909\u3048\u308b<\/h3><p class=\"wp-block-paragraph\">\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u306e\u300c\u306a\u3081\u3089\u304b\u3055\u300d\u306f\u30a4\u30fc\u30b8\u30f3\u30b0\u3067\u6c7a\u307e\u308a\u307e\u3059\u3002<code>ease-out<\/code>\uff08\u6700\u521d\u306f\u901f\u304f\u3001\u6700\u5f8c\u306f\u9045\u304f\uff09\u304c\u6700\u3082\u30ca\u30c1\u30e5\u30e9\u30eb\u306b\u898b\u3048\u308b\u305f\u3081\u3001\u521d\u5fc3\u8005\u306b\u306f <code>ease<\/code> \u307e\u305f\u306f <code>ease-out<\/code> \u304b\u3089\u59cb\u3081\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30a4\u30fc\u30b8\u30f3\u30b0\u6bd4\u8f03 *\/\n.ease-linear   { animation: fadeIn 1s linear forwards; }\n.ease-ease     { animation: fadeIn 1s ease forwards; }\n.ease-ease-in  { animation: fadeIn 1s ease-in forwards; }\n.ease-ease-out { animation: fadeIn 1s ease-out forwards; }\n.ease-cubic    { animation: fadeIn 1s cubic-bezier(0.4, 0, 0.2, 1) forwards; }<\/code><\/pre><\/div><figure class=\"wp-block-table\"><table><thead><tr><th>\u5024<\/th><th>\u52d5\u304d<\/th><th>\u304a\u3059\u3059\u3081\u7528\u9014<\/th><\/tr><\/thead><tbody><tr><td>linear<\/td><td>\u4e00\u5b9a\u901f\u5ea6\u3067\u5909\u5316<\/td><td>\u30ed\u30fc\u30c0\u30fc\u306a\u3069\u6a5f\u68b0\u7684\u306a\u52d5\u304d<\/td><\/tr><tr><td>ease<\/td><td>\u6700\u521d\u3068\u6700\u5f8c\u304c\u5c11\u3057\u3086\u3063\u304f\u308a\uff08\u30c7\u30d5\u30a9\u30eb\u30c8\uff09<\/td><td>\u6c4e\u7528\u7684\u306a\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3<\/td><\/tr><tr><td>ease-in<\/td><td>\u6700\u521d\u3086\u3063\u304f\u308a\u3001\u6700\u5f8c\u901f\u3044<\/td><td>\u8981\u7d20\u304c\u6d88\u3048\u308b\u3068\u304d<\/td><\/tr><tr><td>ease-out<\/td><td>\u6700\u521d\u901f\u304f\u3001\u6700\u5f8c\u3086\u3063\u304f\u308a<\/td><td>\u8981\u7d20\u304c\u73fe\u308c\u308b\u3068\u304d\uff08\u6700\u3082\u30ca\u30c1\u30e5\u30e9\u30eb\uff09<\/td><\/tr><tr><td>cubic-bezier<\/td><td>\u81ea\u7531\u306b\u8abf\u6574<\/td><td>\u30c7\u30b6\u30a4\u30f3\u91cd\u8996\u306e\u51dd\u3063\u305f\u6f14\u51fa<\/td><\/tr><\/tbody><\/table><\/figure><p class=\"wp-block-paragraph\">\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u6642\u9593\u306f <code>0.6s\u301c1.2s<\/code> \u304c\u4f7f\u3044\u3084\u3059\u3044\u30d0\u30e9\u30f3\u30b9\u3067\u3059\u3002\u901f\u3059\u304e\u308b\u3068\u6c17\u3065\u304b\u308c\u305a\u3001\u9045\u3059\u304e\u308b\u3068\u30e6\u30fc\u30b6\u30fc\u306b\u30b9\u30c8\u30ec\u30b9\u3092\u4e0e\u3048\u307e\u3059\u3002\u672c\u6587\u8981\u7d20\u306a\u3089 <code>0.8s<\/code> \u7a0b\u5ea6\u3092\u57fa\u6e96\u306b\u5fae\u8abf\u6574\u3057\u307e\u3057\u3087\u3046\u3002<\/p><h2 class=\"wp-block-heading\">transition\u3092\u4f7f\u3063\u305f\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\uff08\u30af\u30e9\u30b9\u4ed8\u4e0e\u3067\u8868\u793a\u5207\u308a\u66ff\u3048\uff09<\/h2><p class=\"wp-block-paragraph\"><code>@keyframes<\/code> \u4ee5\u5916\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3068\u3057\u3066\u3001<code>transition<\/code> \u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3046\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3061\u3089\u306f\u300c\u72b6\u614b\u5909\u5316\u306e\u3068\u304d\u81ea\u52d5\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u88dc\u9593\u3059\u308b\u300d\u4ed5\u7d44\u307f\u3067\u3059\u3002\u8981\u7d20\u306e\u521d\u671f\u72b6\u614b\u3092 <code>opacity: 0<\/code> \u306b\u3057\u3066\u304a\u304d\u3001JavaScript\u3067\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3059\u308b\u3060\u3051\u3067\u6ed1\u3089\u304b\u306b\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3057\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\"><code>@keyframes<\/code> \u3068\u306e\u9055\u3044\u306f\u300c\u30c8\u30ea\u30ac\u30fc\u3092\u81ea\u5206\u3067\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3057\u3084\u3059\u3044\u300d\u70b9\u306b\u3042\u308a\u307e\u3059\u3002\u30dc\u30bf\u30f3\u30af\u30ea\u30c3\u30af\u6642\u30fb\u30e1\u30cb\u30e5\u30fc\u304c\u958b\u3044\u305f\u3068\u304d\u30fb\u30c7\u30fc\u30bf\u53d6\u5f97\u5b8c\u4e86\u5f8c\u306a\u3069\u3001\u4efb\u610f\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u767a\u706b\u3067\u304d\u307e\u3059\u3002\u30b9\u30af\u30ed\u30fc\u30eb\u9023\u52d5\u306b\u306f\u5225\u9014Intersection Observer\u304c\u5fc5\u8981\u3067\u3059\u304c\uff08Section 4\u3067\u89e3\u8aac\uff09\u3001\u30af\u30ea\u30c3\u30af\u3084\u72b6\u614b\u5909\u5316\u306e\u30c8\u30ea\u30ac\u30fc\u306b\u306f <code>transition<\/code> \u304c\u6700\u9069\u3067\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u57fa\u672c\u69cb\u6210\uff1aCSS\uff0b\u6700\u5c0f\u9650\u306eJS<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u521d\u671f\u72b6\u614b\uff1a\u900f\u660e *\/\n.fade-target {\n  opacity: 0;\n  transition: opacity 0.8s ease-out;\n}\n\n\/* \u30af\u30e9\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u3068\u8868\u793a *\/\n.fade-target.is-visible {\n  opacity: 1;\n}<\/code><\/pre><\/div><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-javascript\" data-lang=\"JavaScript\"><code>\/\/ \u30da\u30fc\u30b8\u8aad\u8fbc\u5f8c\u306b\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3057\u3066\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\nwindow.addEventListener(&#x27;load&#x27;, () =&gt; {\n  document.querySelector(&#x27;.fade-target&#x27;).classList.add(&#x27;is-visible&#x27;);\n});<\/code><\/pre><\/div><p class=\"wp-block-paragraph\">CSS\u5074\u3067\u306f <code>opacity: 0<\/code> \u3092\u521d\u671f\u5024\u3068\u3057\u3066\u8a2d\u5b9a\u3057\u3001<code>transition<\/code> \u3067\u5909\u5316\u306e\u6642\u9593\u3068\u30a4\u30fc\u30b8\u30f3\u30b0\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002JavaScript\u306f <code>classList.add('is-visible')<\/code> \u3092\u547c\u3076\u3060\u3051\u3002\u3053\u308c\u3060\u3051\u3067 <code>opacity<\/code> \u304c <code>0 \u2192 1<\/code> \u306b\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3057\u307e\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u8907\u6570\u8981\u7d20\u3092\u4e00\u62ec\u3067\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3<\/h3><p class=\"wp-block-paragraph\">\u30da\u30fc\u30b8\u5185\u306e\u8907\u6570\u8981\u7d20\u3092\u4e00\u62ec\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3055\u305b\u305f\u3044\u5834\u5408\u306f\u3001\u89aa\u8981\u7d20\uff08<code>body<\/code> \u306a\u3069\uff09\u306b\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3057\u3001CSS\u30bb\u30ec\u30af\u30bf\u3067\u5b50\u5b6b\u8981\u7d20\u3092\u307e\u3068\u3081\u3066\u5236\u5fa1\u3059\u308b\u65b9\u6cd5\u304c\u4fbf\u5229\u3067\u3059\u3002<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30da\u30fc\u30b8\u8aad\u8fbc\u76f4\u5f8c\u306b\u5168\u8981\u7d20\u3092\u4e00\u62ec\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3 *\/\n.fade-target {\n  opacity: 0;\n  transition: opacity 0.8s ease-out;\n}\n\n\/* body \u306b loaded \u30af\u30e9\u30b9\u304c\u4ed8\u3044\u305f\u3068\u304d\u5b50\u5b6b\u3059\u3079\u3066\u8868\u793a *\/\nbody.loaded .fade-target {\n  opacity: 1;\n}<\/code><\/pre><\/div><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-javascript\" data-lang=\"JavaScript\"><code>window.addEventListener(&#x27;load&#x27;, () =&gt; {\n  document.body.classList.add(&#x27;loaded&#x27;);\n});<\/code><\/pre><\/div><p class=\"wp-block-paragraph\">\u3053\u306e\u8a2d\u8a08\u306e\u30e1\u30ea\u30c3\u30c8\u306f\u3001HTML\u4e0a\u3067 <code>.fade-target<\/code> \u30af\u30e9\u30b9\u3092\u4ed8\u3051\u308b\u3060\u3051\u3067\u81ea\u52d5\u7684\u306b\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u306e\u5bfe\u8c61\u306b\u306a\u308b\u70b9\u3067\u3059\u3002JavaScript\u3092\u66f8\u304d\u76f4\u3059\u5fc5\u8981\u304c\u306a\u304f\u3001\u30c7\u30b6\u30a4\u30ca\u30fc\u3068\u30a8\u30f3\u30b8\u30cb\u30a2\u3067\u4f5c\u696d\u3092\u5206\u62c5\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u30db\u30d0\u30fc\u6642\u306e\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\uff08\u304a\u307e\u3051\uff09<\/h3><p class=\"wp-block-paragraph\">\u30e6\u30fc\u30b6\u30fc\u64cd\u4f5c\u3078\u306e\u5fdc\u7b54\u3068\u3057\u3066 <code>transition<\/code> \u3092\u4f7f\u3046\u4f8b\u3068\u3057\u3066\u3001\u30db\u30d0\u30fc\u6642\u306b\u4e0d\u900f\u660e\u5ea6\u3092\u5909\u5316\u3055\u305b\u308b\u8868\u73fe\u3082\u6709\u52b9\u3067\u3059\u3002<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30ea\u30f3\u30af\u30db\u30d0\u30fc\u6642\u306e\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\uff08\u4e0d\u900f\u660e\u5ea6\u5909\u5316\uff09 *\/\n.hover-fade {\n  opacity: 0.6;\n  transition: opacity 0.3s ease;\n}\n\n.hover-fade:hover {\n  opacity: 1;\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\">\u3053\u306e\u5834\u5408\u306fJavaScript\u3059\u3089\u4e0d\u8981\u3067\u3059\u3002<code>:hover<\/code> \u3068\u3044\u3046\u72b6\u614b\u5909\u5316\u306b <code>transition<\/code> \u304c\u81ea\u52d5\u3067\u53cd\u5fdc\u3059\u308b\u305f\u3081\u3001\u7d14\u7c8b\u306aCSS\u3060\u3051\u3067\u5b8c\u7d50\u3057\u307e\u3059\u3002<\/p><figure class=\"wp-block-table\"><table><thead><tr><th>\u624b\u6cd5<\/th><th>\u30c8\u30ea\u30ac\u30fc<\/th><th>JS\u5fc5\u8981?<\/th><th>\u304a\u3059\u3059\u3081\u5834\u9762<\/th><\/tr><\/thead><tbody><tr><td>@keyframes<\/td><td>\u30da\u30fc\u30b8\u8aad\u8fbc\u30fb\u81ea\u52d5<\/td><td>\u4e0d\u8981<\/td><td>\u30da\u30fc\u30b8\u958b\u3044\u305f\u77ac\u9593\u306e\u30a4\u30f3\u30c8\u30ed\u6f14\u51fa<\/td><\/tr><tr><td>transition + class\u4ed8\u4e0e<\/td><td>\u4efb\u610f\u306e\u30a4\u30d9\u30f3\u30c8<\/td><td>\u6570\u884c\u5fc5\u8981<\/td><td>\u30af\u30ea\u30c3\u30af\u30fb\u72b6\u614b\u5909\u5316\u30fb\u30b9\u30af\u30ed\u30fc\u30eb\u9023\u52d5<\/td><\/tr><tr><td>transition + :hover<\/td><td>\u30de\u30a6\u30b9\u30aa\u30fc\u30d0\u30fc<\/td><td>\u4e0d\u8981<\/td><td>\u30dc\u30bf\u30f3\u30fb\u30ea\u30f3\u30af\u306e\u8996\u899a\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u8981\u7d20\u3092\u8868\u793a\u3059\u308b\u65b9\u6cd5\uff08Intersection Observer\uff09<\/h2><p class=\"wp-block-paragraph\">\u300c\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u3066\u8981\u7d20\u304c\u753b\u9762\u306b\u5165\u3063\u3066\u304d\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u300d\u3068\u3044\u3046\u8868\u73fe\u306f\u3001\u73fe\u4ee3\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3067\u6700\u3082\u591a\u304f\u4f7f\u308f\u308c\u308b\u30d1\u30bf\u30fc\u30f3\u306e\u3072\u3068\u3064\u3067\u3059\u3002\u4ee5\u524d\u306f <code>scroll<\/code> \u30a4\u30d9\u30f3\u30c8\u3092\u4f7f\u3063\u3066\u30b9\u30af\u30ed\u30fc\u30eb\u91cf\u3092\u8a08\u7b97\u3059\u308b\u65b9\u6cd5\u304c\u4e3b\u6d41\u3067\u3057\u305f\u304c\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u554f\u984c\u304b\u3089\u73fe\u5728\u306f <strong>Intersection Observer API<\/strong> \u3092\u4f7f\u3046\u306e\u304c\u738b\u9053\u3067\u3059\u3002<\/p><p class=\"wp-block-paragraph\">Intersection Observer \u306f\u300c\u8981\u7d20\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\uff08\u753b\u9762\u306e\u898b\u3048\u308b\u9818\u57df\uff09\u306b\u5165\u3063\u305f\u304b\u51fa\u305f\u304b\u300d\u3092\u52b9\u7387\u3088\u304f\u691c\u77e5\u3059\u308b\u30d6\u30e9\u30a6\u30b6\u6a19\u6e96\u306eAPI\u3067\u3059\u3002<code>scroll<\/code> \u30a4\u30d9\u30f3\u30c8\u3068\u9055\u3044\u3001\u6bce\u30d5\u30ec\u30fc\u30e0\u5b9f\u884c\u3055\u308c\u308b\u308f\u3051\u3067\u306f\u306a\u304f\u30d6\u30e9\u30a6\u30b6\u304c\u6700\u9069\u306a\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u547c\u3073\u51fa\u3059\u305f\u3081\u3001\u91cd\u3044\u51e6\u7406\u306b\u306a\u308a\u307e\u305b\u3093\u30022024\u5e74\u6642\u70b9\u3067\u4e3b\u8981\u30d6\u30e9\u30a6\u30b6\u306e\u30b5\u30dd\u30fc\u30c8\u7387\u306f\u307b\u307c100%\u3067\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u5b8c\u5168\u30b5\u30f3\u30d7\u30eb\uff08HTML \uff0b CSS \uff0b JS\uff09<\/h3><p class=\"wp-block-paragraph\">3\u30d5\u30a1\u30a4\u30eb\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u4f5c\u6210\u3057\u307e\u3059\u3002HTML\u3067\u5bfe\u8c61\u8981\u7d20\u3092\u7528\u610f\u3057\u3001CSS\u3067\u521d\u671f\u72b6\u614b\uff08\u900f\u660e\uff09\u3092\u5b9a\u7fa9\u3057\u3001JavaScript\u3067\u89b3\u5bdf\u3092\u958b\u59cb\u3057\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\">\u307e\u305aHTML\uff1a<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;ja&quot;&gt;\n&lt;head&gt;\n  &lt;meta charset=&quot;UTF-8&quot;&gt;\n  &lt;title&gt;\u30b9\u30af\u30ed\u30fc\u30eb\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3&lt;\/title&gt;\n  &lt;link rel=&quot;stylesheet&quot; href=&quot;style.css&quot;&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n  &lt;div class=&quot;scroll-fade&quot;&gt;\u6700\u521d\u306e\u30ab\u30fc\u30c9&lt;\/div&gt;\n  &lt;div class=&quot;scroll-fade&quot;&gt;2\u756a\u76ee\u306e\u30ab\u30fc\u30c9&lt;\/div&gt;\n  &lt;div class=&quot;scroll-fade&quot;&gt;3\u756a\u76ee\u306e\u30ab\u30fc\u30c9&lt;\/div&gt;\n  &lt;script src=&quot;script.js&quot;&gt;&lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre><\/div><p class=\"wp-block-paragraph\">\u6b21\u306bCSS\uff08<code>style.css<\/code>\uff09\uff1a<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u521d\u671f\u72b6\u614b\uff1a\u975e\u8868\u793a\uff08\u900f\u660e + \u308f\u305a\u304b\u306b\u4e0b\u306b\u305a\u308c\u305f\u4f4d\u7f6e\uff09 *\/\n.scroll-fade {\n  opacity: 0;\n  transform: translateY(20px);\n  transition: opacity 0.7s ease-out, transform 0.7s ease-out;\n}\n\n\/* \u8868\u793a\u72b6\u614b\uff1a\u30af\u30e9\u30b9\u4ed8\u4e0e\u3067\u767a\u52d5 *\/\n.scroll-fade.is-visible {\n  opacity: 1;\n  transform: translateY(0);\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\">\u305d\u3057\u3066JavaScript\uff08<code>script.js<\/code>\uff09\uff1a<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-javascript\" data-lang=\"JavaScript\"><code>\/\/ IntersectionObserver \u3067\u30b9\u30af\u30ed\u30fc\u30eb\u691c\u77e5\nconst observer = new IntersectionObserver(\n  (entries) =&gt; {\n    entries.forEach((entry) =&gt; {\n      \/\/ \u8981\u7d20\u304c\u753b\u9762\u5185\u306b\u5165\u3063\u305f\u3068\u304d\n      if (entry.isIntersecting) {\n        \/\/ \u8868\u793a\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3057\u3066\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\n        entry.target.classList.add(&#x27;is-visible&#x27;);\n        \/\/ \u4e00\u5ea6\u8868\u793a\u3057\u305f\u3089\u76e3\u8996\u3092\u89e3\u9664\uff08\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\uff09\n        observer.unobserve(entry.target);\n      }\n    });\n  },\n  {\n    \/\/ \u8981\u7d20\u304c10%\u4ee5\u4e0a\u898b\u3048\u305f\u3089\u767a\u706b\n    threshold: 0.1,\n    \/\/ \u753b\u9762\u4e0b\u304b\u3089100px\u624b\u524d\u3067\u767a\u706b\uff08\u65e9\u3081\u306e\u30bf\u30a4\u30df\u30f3\u30b0\uff09\n    rootMargin: &#x27;0px 0px -100px 0px&#x27;,\n  }\n);\n\n\/\/ .scroll-fade \u30af\u30e9\u30b9\u3092\u6301\u3064\u5168\u8981\u7d20\u3092\u76e3\u8996\u5bfe\u8c61\u306b\u767b\u9332\ndocument.querySelectorAll(&#x27;.scroll-fade&#x27;).forEach((el) =&gt; {\n  observer.observe(el);\n});<\/code><\/pre><\/div><p class=\"wp-block-paragraph\">\u3053\u3053\u3067\u306f <code>opacity<\/code> \u3060\u3051\u3067\u306a\u304f <code>transform: translateY(20px)<\/code>\uff0820px\u4e0b\u306b\u305a\u308c\u305f\u4f4d\u7f6e\uff09\u3082\u521d\u671f\u5024\u306b\u52a0\u3048\u3066\u3044\u307e\u3059\u3002\u4e0b\u304b\u3089\u3075\u308f\u3063\u3068\u6d6e\u304d\u4e0a\u304c\u308b\u52d5\u304d\u306b\u306a\u308a\u3001\u5358\u7d14\u306a\u900f\u660e\u5ea6\u5909\u5316\u3088\u308a\u8996\u899a\u7684\u306b\u8c4a\u304b\u306a\u6f14\u51fa\u306b\u306a\u308a\u307e\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u30b3\u30fc\u30c9\u306e\u89e3\u8aac<\/h3><p class=\"wp-block-paragraph\"><code>IntersectionObserver<\/code> \u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306b\u306f\u300c\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u95a2\u6570\u300d\u3068\u300c\u30aa\u30d7\u30b7\u30e7\u30f3\u300d\u3092\u6e21\u3057\u307e\u3059\u3002\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u5f15\u6570 <code>entries<\/code> \u306f\u76e3\u8996\u3057\u3066\u3044\u308b\u8981\u7d20\u306e\u914d\u5217\u3067\u3059\u3002<code>entry.isIntersecting<\/code> \u304c <code>true<\/code> \u306b\u306a\u3063\u305f\u3068\u304d\u3001\u305d\u306e\u8981\u7d20\u304c\u753b\u9762\u5185\u306b\u5165\u3063\u305f\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p><ul class=\"wp-block-list\"><li><code>threshold: 0.1<\/code>\uff1a\u8981\u7d20\u306e10%\u304c\u898b\u3048\u305f\u3089\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u547c\u3076\u30020\u306b\u3059\u308b\u30681px\u3067\u3082\u898b\u3048\u305f\u77ac\u9593\u306b\u767a\u706b<\/li><li><code>rootMargin: '0px 0px -100px 0px'<\/code>\uff1a\u753b\u9762\u4e0b\u7aef\u304b\u3089100px\u624b\u524d\u306b\u300c\u4eee\u306e\u5883\u754c\u7dda\u300d\u3092\u5f15\u304f\u3002\u5b9f\u969b\u306b\u753b\u9762\u306b\u5165\u308b\u5c11\u3057\u524d\u306b\u767a\u706b\u3055\u305b\u308b\u3053\u3068\u3067\u3001\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u65e9\u3081\u306b\u8abf\u6574\u3067\u304d\u308b<\/li><li><code>observer.unobserve(entry.target)<\/code>\uff1a\u4e00\u5ea6\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3057\u305f\u3089\u76e3\u8996\u3092\u89e3\u9664\u3002\u540c\u3058\u8981\u7d20\u304c\u518d\u3073\u691c\u77e5\u3055\u308c\u308b\u3053\u3068\u3092\u9632\u304e\u3001\u4f59\u5206\u306a\u51e6\u7406\u3092\u524a\u6e1b<\/li><\/ul><h3 class=\"wp-block-heading\">\u30da\u30fc\u30b8\u5168\u4f53\u306b\u4e00\u62ec\u9069\u7528\u3059\u308b\u5834\u5408<\/h3><p class=\"wp-block-paragraph\">\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3055\u305b\u305f\u3044\u8981\u7d20\u3059\u3079\u3066\u306b <code>scroll-fade<\/code> \u30af\u30e9\u30b9\u3092\u3064\u3051\u308b\u3060\u3051\u3067\u9069\u7528\u3067\u304d\u307e\u3059\u3002JavaScript\u306f\u4e00\u5207\u8ffd\u52a0\u3057\u306a\u304f\u3066OK\u3067\u3059\u3002<code>querySelectorAll('.scroll-fade')<\/code> \u304c\u307e\u3068\u3081\u3066\u5168\u8981\u7d20\u3092\u76e3\u8996\u5bfe\u8c61\u306b\u767b\u9332\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\">\u6ce8\u610f\u70b9\u3068\u3057\u3066\u3001<code>display: none<\/code> \u306b\u306a\u3063\u3066\u3044\u308b\u8981\u7d20\u306fIntersection Observer\u306b\u691c\u77e5\u3055\u308c\u307e\u305b\u3093\u3002<code>opacity: 0<\/code> \u3067\u975e\u8868\u793a\u306b\u3057\u3066 <code>visibility<\/code> \u3084 <code>display<\/code> \u306f\u5909\u66f4\u3057\u306a\u3044\u8a2d\u8a08\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p><h2 class=\"wp-block-heading\">\u65b9\u5411\u4ed8\u304d\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\uff08\u4e0b\u304b\u3089\u30fb\u5de6\u304b\u3089\u30fb\u53f3\u304b\u3089\uff09<\/h2><p class=\"wp-block-paragraph\">\u300c\u305f\u3060\u900f\u660e\u5ea6\u304c\u5909\u308f\u308b\u3060\u3051\u300d\u3088\u308a\u300c\u4e0b\u304b\u3089\u3075\u308f\u3063\u3068\u6d6e\u304d\u4e0a\u304c\u308b\u300d\u300c\u53f3\u304b\u3089\u30b9\u30e9\u30a4\u30c9\u3057\u3066\u304f\u308b\u300d\u3088\u3046\u306a\u52d5\u304d\u306e\u307b\u3046\u304c\u3001\u8996\u899a\u7684\u306b\u30e1\u30ea\u30cf\u30ea\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u5b9f\u73fe\u3059\u308b\u306e\u304c <code>transform<\/code> \u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u3059\u3002<code>opacity<\/code> \u3068\u540c\u6642\u306b <code>translateX \/ translateY<\/code>\uff08\u4f4d\u7f6e\u306e\u305a\u308c\uff09\u3082\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3055\u305b\u308b\u3053\u3068\u3067\u3001\u65b9\u5411\u306e\u3042\u308b\u52d5\u304d\u3092\u4f5c\u308c\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\">\u30dd\u30a4\u30f3\u30c8\u306f\u300c\u521d\u671f\u5024\u306b\u4f4d\u7f6e\u306e\u305a\u308c\u3092\u6301\u305f\u305b\u3001\u8868\u793a\u6642\u306b <code>translate(0, 0)<\/code> \u306b\u623b\u3059\u300d\u3053\u3068\u3067\u3059\u3002\u30d5\u30a7\u30fc\u30c9\u30a2\u30a6\u30c8\u5148\u3092\u5b9a\u7fa9\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u5143\u3092\u5b9a\u7fa9\u3059\u308b\u30a4\u30e1\u30fc\u30b8\u3067\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u65b9\u5411\u5225\u30af\u30e9\u30b9\u306e\u65e9\u898b\u8868<\/h3><figure class=\"wp-block-table\"><table><thead><tr><th>\u30af\u30e9\u30b9\u540d<\/th><th>\u521d\u671f\u5024\uff08transform\uff09<\/th><th>\u52d5\u304d\u306e\u65b9\u5411<\/th><th>\u7528\u9014\u4f8b<\/th><\/tr><\/thead><tbody><tr><td>.fade-up<\/td><td>translateY(40px)<\/td><td>\u4e0b\u304b\u3089\u4e0a\u3078\u6d6e\u304d\u4e0a\u304c\u308b<\/td><td>\u672c\u6587\u30c6\u30ad\u30b9\u30c8\u30fb\u30ab\u30fc\u30c9<\/td><\/tr><tr><td>.fade-down<\/td><td>translateY(-40px)<\/td><td>\u4e0a\u304b\u3089\u4e0b\u3078\u843d\u3061\u3066\u304f\u308b<\/td><td>\u30ca\u30d3\u30b2\u30fc\u30b7\u30e7\u30f3\u30fb\u30d8\u30c3\u30c0\u30fc<\/td><\/tr><tr><td>.fade-left<\/td><td>translateX(40px)<\/td><td>\u53f3\u304b\u3089\u5de6\u3078\u30b9\u30e9\u30a4\u30c9<\/td><td>\u53f3\u30b5\u30a4\u30c9\u30d0\u30fc\u30fb\u753b\u50cf<\/td><\/tr><tr><td>.fade-right<\/td><td>translateX(-40px)<\/td><td>\u5de6\u304b\u3089\u53f3\u3078\u30b9\u30e9\u30a4\u30c9<\/td><td>\u5de6\u30b5\u30a4\u30c9\u30d0\u30fc\u30fb\u898b\u51fa\u3057<\/td><\/tr><\/tbody><\/table><\/figure><h3 class=\"wp-block-heading\">CSS\u5b9f\u88c5<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5171\u901a\u30c8\u30e9\u30f3\u30b8\u30b7\u30e7\u30f3\u8a2d\u5b9a *\/\n.fade-up,\n.fade-down,\n.fade-left,\n.fade-right {\n  opacity: 0;\n  transition: opacity 0.7s ease-out, transform 0.7s ease-out;\n}\n\n\/* \u65b9\u5411\u5225\u306e\u521d\u671f\u4f4d\u7f6e *\/\n.fade-up    { transform: translateY(40px); }  \/* \u4e0b\u304b\u3089\u4e0a\u3078 *\/\n.fade-down  { transform: translateY(-40px); } \/* \u4e0a\u304b\u3089\u4e0b\u3078 *\/\n.fade-left  { transform: translateX(40px); }  \/* \u53f3\u304b\u3089\u5de6\u3078 *\/\n.fade-right { transform: translateX(-40px); } \/* \u5de6\u304b\u3089\u53f3\u3078 *\/\n\n\/* \u8868\u793a\u72b6\u614b\uff08Intersection Observer \u3067\u30af\u30e9\u30b9\u4ed8\u4e0e\uff09 *\/\n.fade-up.is-visible,\n.fade-down.is-visible,\n.fade-left.is-visible,\n.fade-right.is-visible {\n  opacity: 1;\n  transform: translate(0, 0);\n}<\/code><\/pre><\/div><h3 class=\"wp-block-heading\">HTML<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;div class=&quot;fade-up&quot;&gt;\u4e0b\u304b\u3089\u4e0a\u3078\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3&lt;\/div&gt;\n&lt;div class=&quot;fade-left&quot;&gt;\u53f3\u304b\u3089\u5de6\u3078\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3&lt;\/div&gt;\n&lt;div class=&quot;fade-right&quot;&gt;\u5de6\u304b\u3089\u53f3\u3078\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3&lt;\/div&gt;\n&lt;div class=&quot;fade-down&quot;&gt;\u4e0a\u304b\u3089\u4e0b\u3078\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3&lt;\/div&gt;<\/code><\/pre><\/div><h3 class=\"wp-block-heading\">JavaScript\uff08Intersection Observer\uff09<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-javascript\" data-lang=\"JavaScript\"><code>\/\/ \u5168\u65b9\u5411\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u8981\u7d20\u3092\u4e00\u62ec\u76e3\u8996\nconst targets = document.querySelectorAll(\n  &#x27;.fade-up, .fade-down, .fade-left, .fade-right&#x27;\n);\n\nconst observer = new IntersectionObserver(\n  (entries) =&gt; {\n    entries.forEach((entry) =&gt; {\n      if (entry.isIntersecting) {\n        entry.target.classList.add(&#x27;is-visible&#x27;);\n        observer.unobserve(entry.target);\n      }\n    });\n  },\n  { threshold: 0.1, rootMargin: &#x27;0px 0px -80px 0px&#x27; }\n);\n\ntargets.forEach((el) =&gt; observer.observe(el));<\/code><\/pre><\/div><p class=\"wp-block-paragraph\"><code>querySelectorAll<\/code> \u306e\u30bb\u30ec\u30af\u30bf\u3092\u30ab\u30f3\u30de\u533a\u5207\u308a\u3067\u66f8\u304f\u3068\u3001\u3059\u3079\u3066\u306e\u65b9\u5411\u30af\u30e9\u30b9\u3092\u307e\u3068\u3081\u3066\u76e3\u8996\u5bfe\u8c61\u306b\u3067\u304d\u307e\u3059\u3002JavaScript\u5074\u306e\u51e6\u7406\u306f\u65b9\u5411\u306b\u95a2\u4fc2\u306a\u304f\u540c\u3058\u306a\u306e\u3067\u3001\u30b3\u30fc\u30c9\u304c\u30b7\u30f3\u30d7\u30eb\u306b\u4fdd\u3066\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\">\u79fb\u52d5\u91cf\uff08\u3053\u3053\u3067\u306f <code>40px<\/code>\uff09\u306f\u753b\u9762\u30b5\u30a4\u30ba\u3084\u8981\u7d20\u306e\u5927\u304d\u3055\u306b\u3088\u3063\u3066\u8abf\u6574\u3057\u307e\u3057\u3087\u3046\u3002\u30e2\u30d0\u30a4\u30eb\u5411\u3051\u306f <code>20\u301c30px<\/code>\u3001\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u306e\u5927\u304d\u306a\u8981\u7d20\u306b\u306f <code>50\u301c60px<\/code> \u7a0b\u5ea6\u304c\u81ea\u7136\u306b\u898b\u3048\u307e\u3059\u3002\u5927\u304d\u3059\u304e\u308b\u3068\u300c\u98db\u3093\u3067\u304f\u308b\u611f\u3058\u300d\u306b\u306a\u308a\u3001\u5b89\u3063\u307d\u3044\u5370\u8c61\u306b\u306a\u308a\u307e\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u30ca\u30ca\u30e1\u65b9\u5411\u306e\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\uff08\u4e0a\u4e0b+\u5de6\u53f3\u306e\u7d44\u307f\u5408\u308f\u305b\uff09<\/h3><p class=\"wp-block-paragraph\">\u4e0a\u4e0b\u3068\u5de6\u53f3\u3092\u540c\u6642\u306b\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u659c\u3081\u306e\u52d5\u304d\u3082\u4f5c\u308c\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u5de6\u4e0b\u304b\u3089\u53f3\u4e0a\u3078\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3059\u308b\u306a\u3089\u521d\u671f\u5024\u3092 <code>transform: translate(-30px, 30px)<\/code> \u306b\u3057\u3066\u3001\u8868\u793a\u6642\u306b <code>transform: translate(0, 0)<\/code> \u306b\u3057\u307e\u3059\u3002<\/p><h2 class=\"wp-block-heading\">\u8907\u6570\u8981\u7d20\u3092\u6642\u9593\u5dee\u3067\u8868\u793a\u3059\u308b\uff08stagger\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\uff09<\/h2><p class=\"wp-block-paragraph\">\u300c\u30ea\u30b9\u30c8\u306e\u5404\u9805\u76ee\u304c\u9806\u756a\u306b\u3075\u308f\u3063\u3068\u73fe\u308c\u308b\u300d\u300c\u30ab\u30fc\u30c9\u304c\u4e00\u679a\u305a\u3064\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u305a\u3089\u3057\u3066\u8868\u793a\u3055\u308c\u308b\u300d\u2014\u2014\u3053\u308c\u3092 <strong>stagger\uff08\u30b9\u30bf\u30c3\u30ac\u30fc\uff09\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3<\/strong> \u3068\u547c\u3073\u307e\u3059\u3002\u5168\u8981\u7d20\u304c\u4e00\u6589\u306b\u8868\u793a\u3055\u308c\u308b\u3088\u308a\u3001\u6642\u9593\u5dee\u3092\u3064\u3051\u305f\u307b\u3046\u304c\u30ea\u30ba\u30e0\u304c\u751f\u307e\u308c\u3001\u60c5\u5831\u304c\u8aad\u307f\u53d6\u308a\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\">CSS\u3067\u6642\u9593\u5dee\u3092\u4f5c\u308b\u65b9\u6cd5\u306f\u4e3b\u306b2\u3064\u3042\u308a\u307e\u3059\u3002\u2460 <code>nth-child<\/code> \u3067\u5404\u8981\u7d20\u306b\u7570\u306a\u308b <code>transition-delay<\/code> \u3092\u6307\u5b9a\u3059\u308b\u65b9\u6cd5\u3068\u3001\u2461 CSS\u30ab\u30b9\u30bf\u30e0\u30d7\u30ed\u30d1\u30c6\u30a3\uff08\u5909\u6570\uff09\u3068 <code>calc()<\/code> \u3092\u7d44\u307f\u5408\u308f\u305b\u3066HTML\u5074\u3067\u9045\u5ef6\u306e\u4fc2\u6570\u3092\u6e21\u3059\u65b9\u6cd5\u3067\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u65b9\u6cd5\u2460\uff1anth-child \u3067\u6642\u9593\u5dee\u3092\u6307\u5b9a<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;ul class=&quot;stagger-list&quot;&gt;\n  &lt;li&gt;\u30ea\u30b9\u30c8\u9805\u76ee1&lt;\/li&gt;\n  &lt;li&gt;\u30ea\u30b9\u30c8\u9805\u76ee2&lt;\/li&gt;\n  &lt;li&gt;\u30ea\u30b9\u30c8\u9805\u76ee3&lt;\/li&gt;\n  &lt;li&gt;\u30ea\u30b9\u30c8\u9805\u76ee4&lt;\/li&gt;\n  &lt;li&gt;\u30ea\u30b9\u30c8\u9805\u76ee5&lt;\/li&gt;\n&lt;\/ul&gt;<\/code><\/pre><\/div><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5171\u901a\u8a2d\u5b9a\uff1a\u975e\u8868\u793a *\/\n.stagger-list li {\n  opacity: 0;\n  transform: translateY(20px);\n  transition: opacity 0.5s ease-out, transform 0.5s ease-out;\n}\n\n\/* nth-child \u3067\u5404\u8981\u7d20\u306b\u7570\u306a\u308b\u9045\u5ef6\u3092\u6307\u5b9a *\/\n.stagger-list.is-visible li:nth-child(1) { transition-delay: 0s; }\n.stagger-list.is-visible li:nth-child(2) { transition-delay: 0.1s; }\n.stagger-list.is-visible li:nth-child(3) { transition-delay: 0.2s; }\n.stagger-list.is-visible li:nth-child(4) { transition-delay: 0.3s; }\n.stagger-list.is-visible li:nth-child(5) { transition-delay: 0.4s; }\n\n\/* \u8868\u793a\u72b6\u614b *\/\n.stagger-list.is-visible li {\n  opacity: 1;\n  transform: translateY(0);\n}<\/code><\/pre><\/div><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-javascript\" data-lang=\"JavaScript\"><code>\/\/ \u89aa\u8981\u7d20\u3092\u76e3\u8996\u3057\u3066\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\nconst list = document.querySelector(&#x27;.stagger-list&#x27;);\n\nconst observer = new IntersectionObserver(\n  (entries) =&gt; {\n    entries.forEach((entry) =&gt; {\n      if (entry.isIntersecting) {\n        entry.target.classList.add(&#x27;is-visible&#x27;);\n        observer.unobserve(entry.target);\n      }\n    });\n  },\n  { threshold: 0.1 }\n);\n\nobserver.observe(list);<\/code><\/pre><\/div><p class=\"wp-block-paragraph\">\u89aa\u8981\u7d20\uff08<code>.stagger-list<\/code>\uff09\u304c\u753b\u9762\u306b\u5165\u3063\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067 <code>is-visible<\/code> \u3092\u4ed8\u4e0e\u3059\u308b\u3068\u3001CSS\u5074\u3067 <code>transition-delay<\/code> \u304c\u52b9\u3044\u3066\u5b50\u8981\u7d20\u304c\u9806\u756a\u306b\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3057\u307e\u3059\u3002JavaScript\u306f\u89aa\u8981\u7d20\u3092\u4e00\u3064\u76e3\u8996\u3059\u308b\u3060\u3051\u3067\u3088\u304f\u3001\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002<\/p><p class=\"wp-block-paragraph\">\u30c7\u30e1\u30ea\u30c3\u30c8\u306f\u300c\u8981\u7d20\u6570\u304c\u5897\u3048\u308b\u3068CSS\u306e\u884c\u6570\u3082\u5897\u3048\u308b\u300d\u70b9\u3067\u3059\u30025\u301c8\u9805\u76ee\u7a0b\u5ea6\u306a\u3089\u3053\u306e\u65b9\u6cd5\u3067\u5341\u5206\u3067\u3059\u304c\u3001\u53ef\u5909\u9577\u306e\u5834\u5408\u306f\u6b21\u306e\u65b9\u6cd5\u304c\u5411\u3044\u3066\u3044\u307e\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u65b9\u6cd5\u2461\uff1aCSS\u30ab\u30b9\u30bf\u30e0\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u9045\u5ef6\u3092\u52d5\u7684\u8a08\u7b97<\/h3><p class=\"wp-block-paragraph\">\u8981\u7d20\u6570\u304c\u52d5\u7684\u306b\u5909\u308f\u308b\u5834\u5408\u3084CSS\u3092\u3059\u3063\u304d\u308a\u4fdd\u3061\u305f\u3044\u5834\u5408\u306f\u3001HTML\u5074\u3067 <code>--i<\/code> \u3068\u3044\u3046\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5909\u6570\u3092\u6e21\u3057\u3001CSS\u5074\u3067 <code>calc()<\/code> \u3092\u4f7f\u3063\u3066\u9045\u5ef6\u3092\u8a08\u7b97\u3059\u308b\u65b9\u6cd5\u304c\u4fbf\u5229\u3067\u3059\u3002<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* CSS \u30ab\u30b9\u30bf\u30e0\u30d7\u30ed\u30d1\u30c6\u30a3 + calc() \u3067\u9045\u5ef6\u3092\u81ea\u52d5\u8a08\u7b97 *\/\n.stagger-card {\n  opacity: 0;\n  transform: translateY(30px);\n  transition: opacity 0.6s ease-out calc(var(--i, 0) * 0.12s),\n              transform 0.6s ease-out calc(var(--i, 0) * 0.12s);\n}\n\n.stagger-card.is-visible {\n  opacity: 1;\n  transform: translateY(0);\n}<\/code><\/pre><\/div><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!-- HTML\u5074\u3067CSS\u5909\u6570\u3092\u6e21\u3059 --&gt;\n&lt;div class=&quot;stagger-card&quot; style=&quot;--i: 0&quot;&gt;\u30ab\u30fc\u30c91&lt;\/div&gt;\n&lt;div class=&quot;stagger-card&quot; style=&quot;--i: 1&quot;&gt;\u30ab\u30fc\u30c92&lt;\/div&gt;\n&lt;div class=&quot;stagger-card&quot; style=&quot;--i: 2&quot;&gt;\u30ab\u30fc\u30c93&lt;\/div&gt;\n&lt;div class=&quot;stagger-card&quot; style=&quot;--i: 3&quot;&gt;\u30ab\u30fc\u30c94&lt;\/div&gt;<\/code><\/pre><\/div><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-javascript\" data-lang=\"JavaScript\"><code>\/\/ \u5404\u30ab\u30fc\u30c9\u3092\u500b\u5225\u306b\u76e3\u8996\u3059\u308b\u5834\u5408\nconst cards = document.querySelectorAll(&#x27;.stagger-card&#x27;);\n\nconst observer = new IntersectionObserver(\n  (entries) =&gt; {\n    entries.forEach((entry) =&gt; {\n      if (entry.isIntersecting) {\n        entry.target.classList.add(&#x27;is-visible&#x27;);\n        observer.unobserve(entry.target);\n      }\n    });\n  },\n  { threshold: 0.1, rootMargin: &#x27;0px 0px -60px 0px&#x27; }\n);\n\ncards.forEach((card) =&gt; observer.observe(card));<\/code><\/pre><\/div><p class=\"wp-block-paragraph\"><code>--i<\/code> \u306b <code>0, 1, 2, 3...<\/code> \u3092\u6e21\u3059\u3068\u3001\u305d\u308c\u305e\u308c <code>0s, 0.12s, 0.24s, 0.36s<\/code> \u306e\u9045\u5ef6\u304c\u8a08\u7b97\u3055\u308c\u307e\u3059\u3002CSS\u3092\u4e00\u5207\u5909\u66f4\u305b\u305aHTML\u5074\u3060\u3051\u8ffd\u52a0\u3059\u308c\u3070\u65b0\u3057\u3044\u8981\u7d20\u304c\u5897\u3084\u305b\u308b\u305f\u3081\u3001CMS\u3067\u52d5\u7684\u306b\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u5909\u308f\u308b\u30da\u30fc\u30b8\u306b\u5411\u3044\u3066\u3044\u307e\u3059\u3002<\/p><figure class=\"wp-block-table\"><table><thead><tr><th>\u65b9\u6cd5<\/th><th>\u5411\u3044\u3066\u3044\u308b\u5834\u9762<\/th><th>\u30e1\u30ea\u30c3\u30c8<\/th><th>\u30c7\u30e1\u30ea\u30c3\u30c8<\/th><\/tr><\/thead><tbody><tr><td>nth-child + transition-delay<\/td><td>\u56fa\u5b9a\u6570\u306e\u30ea\u30b9\u30c8<\/td><td>CSS\u306e\u307f\u3067\u5b8c\u7d50\uff08JS\u306f\u89aa\u76e3\u8996\u306e\u307f\uff09<\/td><td>\u8981\u7d20\u6570\u304c\u591a\u3044\u3068CSS\u304c\u5897\u3048\u308b<\/td><\/tr><tr><td>CSS\u5909\u6570 + calc()<\/td><td>\u52d5\u7684\u30fb\u53ef\u5909\u9577\u306e\u30ea\u30b9\u30c8<\/td><td>CSS\u30fbJS\u5171\u306b\u30b7\u30f3\u30d7\u30eb<\/td><td>HTML\u5074\u306b&#8211;i\u8ffd\u52a0\u304c\u5fc5\u8981<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">\u6700\u65b0CSS\u3060\u3051\u3067\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\uff08animation-timeline: view()\uff09<\/h2><p class=\"wp-block-paragraph\">2024\u5e74\u4ee5\u964d\u3001Chrome\u30fbEdge\u30fbFirefox \u306e\u6700\u65b0\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f <strong>Scroll-driven Animations\uff08\u30b9\u30af\u30ed\u30fc\u30eb\u99c6\u52d5\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\uff09<\/strong> \u3068\u3044\u3046\u4ed5\u69d8\u304c\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u306b\u3088\u308a\u3001Intersection Observer \u3059\u3089\u4f7f\u308f\u305a\u3001\u7d14\u7c8b\u306aCSS\u3060\u3051\u3067\u30b9\u30af\u30ed\u30fc\u30eb\u9023\u52d5\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\"><code>animation-timeline: view()<\/code> \u306f\u300c\u8981\u7d20\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u306b\u5bfe\u3057\u3066\u3069\u306e\u304f\u3089\u3044\u898b\u3048\u3066\u3044\u308b\u304b\u300d\u3092\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u6642\u9593\u8ef8\u3068\u3057\u3066\u4f7f\u3046\u6a5f\u80fd\u3067\u3059\u3002<code>animation-range<\/code> \u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u518d\u751f\u3059\u308b\u7bc4\u56f2\u3092\u300c\u8981\u7d20\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u306b\u5165\u308a\u59cb\u3081\u305f\u77ac\u9593\u304b\u3089\u4f55%\u307e\u3067\u300d\u3068\u3044\u3046\u5f62\u3067\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p><p class=\"wp-block-paragraph\"><strong>\u91cd\u8981\u306a\u6ce8\u610f\u70b9<\/strong>\uff1a2024\u5e74\u6642\u70b9\u3067Safari\uff08iOS\u542b\u3080\uff09\u306e\u30b5\u30dd\u30fc\u30c8\u304c\u5b8c\u5168\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u672c\u756a\u74b0\u5883\u3067\u4f7f\u3046\u5834\u5408\u306f\u5fc5\u305a\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u7528\u610f\u3059\u308b\u304b\u3001\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u306e\u30b7\u30a7\u30a2\u3092\u78ba\u8a8d\u3057\u305f\u3046\u3048\u3067\u63a1\u7528\u3092\u5224\u65ad\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p><h3 class=\"wp-block-heading\">\u57fa\u672c\u5b9f\u88c5<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;div class=&quot;scroll-animate&quot;&gt;\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u8868\u793a1&lt;\/div&gt;\n&lt;div class=&quot;scroll-animate&quot;&gt;\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u8868\u793a2&lt;\/div&gt;\n&lt;div class=&quot;scroll-animate&quot;&gt;\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u8868\u793a3&lt;\/div&gt;<\/code><\/pre><\/div><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30b9\u30af\u30ed\u30fc\u30eb\u99c6\u52d5\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\uff08Scroll-driven Animations\uff09 *\/\n@keyframes fadeInUp {\n  from {\n    opacity: 0;\n    transform: translateY(40px);\n  }\n  to {\n    opacity: 1;\n    transform: translateY(0);\n  }\n}\n\n.scroll-animate {\n  animation: fadeInUp linear both;\n  \/* \u30b9\u30af\u30ed\u30fc\u30eb\u4f4d\u7f6e\u3092\u6642\u9593\u8ef8\u3068\u3057\u3066\u4f7f\u7528 *\/\n  animation-timeline: view();\n  \/* \u8981\u7d20\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u306b\u5165\u308a\u59cb\u3081\u3066\u304b\u308930%\u307e\u3067\u518d\u751f *\/\n  animation-range: entry 0% entry 30%;\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\"><code>animation-timeline: view()<\/code> \u3092\u6307\u5b9a\u3057\u305f\u8981\u7d20\u306f\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u4f4d\u7f6e\u306b\u5408\u308f\u305b\u3066\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u9032\u307f\u307e\u3059\u3002<code>animation-range: entry 0% entry 30%<\/code> \u306f\u300c\u8981\u7d20\u304c\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u306b\u5165\u308a\u59cb\u3081\u305f\u77ac\u9593\uff08entry 0%\uff09\u304b\u3089\u300130%\u307e\u3067\u898b\u3048\u305f\u72b6\u614b\uff08entry 30%\uff09\u306e\u9593\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u5b8c\u4e86\u3055\u305b\u308b\u300d\u3068\u3044\u3046\u610f\u5473\u3067\u3059\u3002<\/p><p class=\"wp-block-paragraph\"><code>animation<\/code> \u306e <code>linear<\/code> \u306f\u30b9\u30af\u30ed\u30fc\u30eb\u901f\u5ea6\u306b\u6bd4\u4f8b\u3057\u3066\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u9032\u3080\u6307\u5b9a\u3067\u3001<code>both<\/code> \u306f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u524d\u5f8c\u3069\u3061\u3089\u3082\u6307\u5b9a\u72b6\u614b\u3092\u7dad\u6301\u3059\u308b\u6307\u5b9a\u3067\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u672a\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u3078\u306e\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af<\/h3><p class=\"wp-block-paragraph\"><code>@supports<\/code> \u3067\u5bfe\u5fdc\u72b6\u6cc1\u3092\u691c\u51fa\u3057\u3001\u975e\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u306b\u306fIntersection Observer \u30d9\u30fc\u30b9\u306e\u5b9f\u88c5\u3092\u9069\u7528\u3057\u307e\u3059\u3002<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\uff1a\u672a\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u306fJS\u3067\u5bfe\u5fdc *\/\n@supports not (animation-timeline: view()) {\n  .scroll-animate {\n    opacity: 0;\n    transform: translateY(40px);\n    transition: opacity 0.7s ease-out, transform 0.7s ease-out;\n  }\n\n  .scroll-animate.is-visible {\n    opacity: 1;\n    transform: translateY(0);\n  }\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\">\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u7528\u306eJavaScript\u306fSection 3\u306eIntersection Observer\u306e\u30b3\u30fc\u30c9\u3092\u305d\u306e\u307e\u307e\u6d41\u7528\u3067\u304d\u307e\u3059\u3002<code>@supports not (animation-timeline: view())<\/code> \u30d6\u30ed\u30c3\u30af\u5185\u306eCSS\u306f\u5bfe\u5fdc\u30d6\u30e9\u30a6\u30b6\u306b\u306f\u9069\u7528\u3055\u308c\u306a\u3044\u305f\u3081\u3001\u4e21\u65b9\u66f8\u3044\u3066\u3082\u30b9\u30bf\u30a4\u30eb\u304c\u885d\u7a81\u3059\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p><figure class=\"wp-block-table\"><table><thead><tr><th>\u30d6\u30e9\u30a6\u30b6<\/th><th>Scroll-driven Animations\u5bfe\u5fdc\u72b6\u6cc1<\/th><th>\u5099\u8003<\/th><\/tr><\/thead><tbody><tr><td>Chrome 115+<\/td><td>\u5bfe\u5fdc<\/td><td>\u6700\u3082\u65e9\u304f\u5b9f\u88c5<\/td><\/tr><tr><td>Edge 115+<\/td><td>\u5bfe\u5fdc<\/td><td>Chromium\u30d9\u30fc\u30b9\u306e\u305f\u3081Chrome\u3068\u540c\u3058<\/td><\/tr><tr><td>Firefox 110+<\/td><td>\u5bfe\u5fdc\uff08\u4e00\u90e8\u30d5\u30e9\u30b0\u89e3\u9664\u304c\u5fc5\u8981\uff09<\/td><td>\u30d5\u30e9\u30b0\u4e0d\u8981\u306f124+\u304b\u3089<\/td><\/tr><tr><td>Safari 17.2+<\/td><td>\u90e8\u5206\u5bfe\u5fdc<\/td><td>\u5168\u6a5f\u80fd\u306f\u672a\u5bfe\u5fdc\u3002\u672c\u756a\u6295\u5165\u306f\u8981\u691c\u8a0e<\/td><\/tr><tr><td>iOS Safari<\/td><td>\u90e8\u5206\u5bfe\u5fdc<\/td><td>PC\u3068\u540c\u69d8\u306e\u5236\u7d04\u3042\u308a<\/td><\/tr><\/tbody><\/table><\/figure><p class=\"wp-block-paragraph\">\u5c06\u6765\u7684\u306b\u306fSafari\u306e\u5bfe\u5fdc\u304c\u9032\u307f\u3001JavaScript\u306a\u3057\u306e\u30b9\u30af\u30ed\u30fc\u30eb\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u6a19\u6e96\u306b\u306a\u308b\u3068\u898b\u3089\u308c\u3066\u3044\u307e\u3059\u3002\u4eca\u306e\u3046\u3061\u306b\u66f8\u304d\u65b9\u3092\u628a\u63e1\u3057\u3066\u304a\u304d\u3001\u672c\u756a\u6295\u5165\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u306f\u30d6\u30e9\u30a6\u30b6\u30b7\u30a7\u30a2\u3068\u76f8\u8ac7\u3057\u306a\u304c\u3089\u5224\u65ad\u3057\u307e\u3057\u3087\u3046\u3002<\/p><h2 class=\"wp-block-heading\">\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u914d\u616e\uff08prefers-reduced-motion\uff09<\/h2><p class=\"wp-block-paragraph\">\u753b\u9762\u4e0a\u306e\u52d5\u304d\u306b\u654f\u611f\u306a\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306f\u982d\u75db\u30fb\u3081\u307e\u3044\u30fb\u4e0d\u5feb\u611f\u3092\u5f15\u304d\u8d77\u3053\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u524d\u5ead\u6a5f\u80fd\u969c\u5bb3\uff08\u5e73\u8861\u611f\u899a\u306b\u95a2\u308f\u308b\u969c\u5bb3\uff09\u3092\u6301\u3064\u65b9\u3001\u3066\u3093\u304b\u3093\u306e\u65b9\u3001\u307e\u305f\u306f\u5358\u7d14\u306b\u52d5\u304d\u304c\u82e6\u624b\u306a\u65b9\u306b\u5bfe\u3057\u3066\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u7121\u52b9\u5316\u3057\u305f\u308a\u3001\u63a7\u3048\u3081\u306b\u3057\u305f\u308a\u3059\u308b\u914d\u616e\u304c\u91cd\u8981\u3067\u3059\u3002<\/p><p class=\"wp-block-paragraph\">OS \u3084\u30d6\u30e9\u30a6\u30b6\u306b\u306f\u300c\u52d5\u304d\u3092\u6e1b\u3089\u3059\u30e2\u30fc\u30c9\u300d\u306e\u8a2d\u5b9a\u304c\u3042\u308a\u307e\u3059\u3002macOS \u306a\u3089\u300c\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u300d\u2192\u300c\u8996\u899a\u7684\u30a8\u30d5\u30a7\u30af\u30c8\u3092\u6e1b\u3089\u3059\u300d\u3001Windows \u306a\u3089\u300c\u30b7\u30b9\u30c6\u30e0\u8a2d\u5b9a\u300d\u2192\u300c\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u8868\u793a\u3059\u308b\u300d\u306e\u30aa\u30d5\u304c\u305d\u308c\u306b\u3042\u305f\u308a\u307e\u3059\u3002CSS\u3067\u306f\u3053\u306e\u8a2d\u5b9a\u3092 <code>prefers-reduced-motion<\/code> \u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3067\u691c\u51fa\u3067\u304d\u307e\u3059\u3002<\/p><h3 class=\"wp-block-heading\">@keyframes\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3078\u306e\u5bfe\u5fdc<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u57fa\u672c\u306e\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3 *\/\n@keyframes fadeIn {\n  from { opacity: 0; transform: translateY(20px); }\n  to   { opacity: 1; transform: translateY(0); }\n}\n\n.fade-in {\n  animation: fadeIn 0.8s ease-out forwards;\n}\n\n\/* \u52d5\u304d\u3092\u6e1b\u3089\u3059\u8a2d\u5b9a\u3092\u512a\u5148\u3059\u308b\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea *\/\n@media (prefers-reduced-motion: reduce) {\n  .fade-in {\n    \/* \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u7121\u52b9\u5316 *\/\n    animation: none;\n    \/* \u6700\u7d42\u72b6\u614b\uff08\u8868\u793a\u6e08\u307f\uff09\u3092\u5373\u6642\u9069\u7528 *\/\n    opacity: 1;\n    transform: none;\n  }\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\"><code>prefers-reduced-motion: reduce<\/code> \u304c\u6709\u52b9\u306a\u5834\u5408\u3001<code>animation: none<\/code> \u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u7121\u52b9\u5316\u3057\u3001<code>opacity: 1<\/code> \u3068 <code>transform: none<\/code> \u3067\u6700\u7d42\u72b6\u614b\u3092\u5373\u6642\u9069\u7528\u3057\u307e\u3059\u3002\u300c\u8981\u7d20\u304c\u898b\u3048\u306a\u3044\u72b6\u614b\u306e\u307e\u307e\u6b62\u307e\u3063\u3066\u3057\u307e\u3046\u300d\u3053\u3068\u3092\u9632\u3050\u306e\u304c\u91cd\u8981\u3067\u3059\u3002<\/p><h3 class=\"wp-block-heading\">Intersection Observer \u30d1\u30bf\u30fc\u30f3\u3078\u306e\u5bfe\u5fdc<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* Intersection Observer \u4f7f\u7528\u30d1\u30bf\u30fc\u30f3\u3067\u306e\u914d\u616e *\/\n.scroll-fade {\n  opacity: 0;\n  transform: translateY(20px);\n  transition: opacity 0.7s ease-out, transform 0.7s ease-out;\n}\n\n.scroll-fade.is-visible {\n  opacity: 1;\n  transform: translateY(0);\n}\n\n\/* \u52d5\u304d\u304c\u82e6\u624b\u306a\u30e6\u30fc\u30b6\u30fc\uff1a\u5373\u6642\u8868\u793a *\/\n@media (prefers-reduced-motion: reduce) {\n  .scroll-fade,\n  .scroll-fade.is-visible {\n    opacity: 1;\n    transform: none;\n    transition: none;\n  }\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\"><code>.scroll-fade<\/code> \u3068 <code>.scroll-fade.is-visible<\/code> \u306e\u4e21\u65b9\u3092\u5bfe\u8c61\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u30af\u30e9\u30b9\u304c\u4ed8\u4e0e\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306b\u95a2\u4fc2\u306a\u304f\u3001\u5e38\u306b <code>opacity: 1<\/code> \u304c\u7dad\u6301\u3055\u308c\u307e\u3059\u3002JavaScript\u306eIntersection Observer\u51e6\u7406\u81ea\u4f53\u306f\u6b8b\u3057\u3066\u304a\u3044\u3066\u69cb\u3044\u307e\u305b\u3093\uff08\u30af\u30e9\u30b9\u304c\u4ed8\u4e0e\u3055\u308c\u3066\u3082\u8868\u793a\u72b6\u614b\u306f\u5909\u308f\u3089\u306a\u3044\u306e\u3067\u7121\u5bb3\u3067\u3059\uff09\u3002<\/p><h3 class=\"wp-block-heading\">\u3088\u308a\u5b89\u5168\u306a\u30c7\u30d5\u30a9\u30eb\u30c8\u512a\u5148\u306e\u66f8\u304d\u65b9<\/h3><p class=\"wp-block-paragraph\">\u300c\u30c7\u30d5\u30a9\u30eb\u30c8\u306f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306a\u3057\u3001\u52d5\u304d\u3092\u8a31\u53ef\u3059\u308b\u8a2d\u5b9a\u306e\u3068\u304d\u3060\u3051\u6709\u52b9\u306b\u3059\u308b\u300d\u3068\u3044\u3046\u66f8\u304d\u65b9\u3082\u3042\u308a\u307e\u3059\u3002\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u30d5\u30a1\u30fc\u30b9\u30c8\u306e\u8003\u3048\u65b9\u3067\u3059\u3002<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u3055\u3089\u306b\u5b89\u5168\u306a\u66f8\u304d\u65b9\uff1a\u6700\u521d\u304b\u3089\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u7121\u52b9\u3092\u5ba3\u8a00\u3057\u3066\u304b\u3089\u4e0a\u66f8\u304d *\/\n.fade-in {\n  \/* \u30c7\u30d5\u30a9\u30eb\u30c8\uff1a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306a\u3057 *\/\n  animation: none;\n  opacity: 1;\n}\n\n\/* \u52d5\u304d\u3092\u8a31\u53ef\u3059\u308b\u74b0\u5883\u3067\u306e\u307f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u9069\u7528 *\/\n@media (prefers-reduced-motion: no-preference) {\n  .fade-in {\n    opacity: 0;\n    animation: fadeIn 0.8s ease-out forwards;\n  }\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\">\u3053\u306e\u66f8\u304d\u65b9\u306f\u300c\u30e6\u30fc\u30b6\u30fc\u304c\u660e\u793a\u7684\u306b\u52d5\u304d\u3092\u8a31\u53ef\u3057\u3066\u3044\u306a\u3044\u9650\u308a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3057\u306a\u3044\u300d\u3068\u3044\u3046\u6700\u3082\u5b89\u5168\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3067\u3059\u3002\u5927\u898f\u6a21\u30b5\u30fc\u30d3\u30b9\u3084\u516c\u5171\u6a5f\u95a2\u306e\u30b5\u30a4\u30c8\u306a\u3069\u3001\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u8981\u4ef6\u304c\u53b3\u3057\u3044\u5834\u5408\u306b\u5411\u3044\u3066\u3044\u307e\u3059\u3002<\/p><figure class=\"wp-block-table\"><table><thead><tr><th>\u5bfe\u5fdc\u30ec\u30d9\u30eb<\/th><th>\u5b9f\u88c5\u65b9\u6cd5<\/th><th>\u5411\u3044\u3066\u3044\u308b\u30d7\u30ed\u30b8\u30a7\u30af\u30c8<\/th><\/tr><\/thead><tbody><tr><td>\u6700\u4f4e\u9650<\/td><td>prefers-reduced-motion: reduce \u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u7121\u52b9\u5316<\/td><td>\u500b\u4eba\u30b5\u30a4\u30c8\u30fb\u30dd\u30fc\u30c8\u30d5\u30a9\u30ea\u30aa<\/td><\/tr><tr><td>\u63a8\u5968<\/td><td>\u4e21\u65b9\u306e\u30b1\u30fc\u30b9\u3092\u660e\u793a\u7684\u306bCSS\u3067\u66f8\u304f<\/td><td>\u4f01\u696d\u30b5\u30a4\u30c8\u30fbWeb\u30b5\u30fc\u30d3\u30b9<\/td><\/tr><tr><td>\u6700\u9ad8\u6c34\u6e96<\/td><td>prefers-reduced-motion: no-preference \u3067\u306e\u307f\u6709\u52b9\u5316<\/td><td>\u516c\u5171\u6a5f\u95a2\u30fb\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u91cd\u8996\u30b5\u30fc\u30d3\u30b9<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u304c\u52b9\u304b\u306a\u3044\u3068\u304d\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8<\/h2><p class=\"wp-block-paragraph\">CSS\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3092\u5b9f\u88c5\u3057\u305f\u3051\u308c\u3069\u300c\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3057\u306a\u3044\u300d\u300c\u4e00\u77ac\u3067\u8868\u793a\u3055\u308c\u308b\u300d\u300c\u8981\u7d20\u304c\u6d88\u3048\u305f\u307e\u307e\u300d\u3068\u3044\u3063\u305f\u30c8\u30e9\u30d6\u30eb\u306f\u3088\u304f\u8d77\u304d\u307e\u3059\u3002\u539f\u56e0\u306e\u307b\u3068\u3093\u3069\u306f\u30d1\u30bf\u30fc\u30f3\u304c\u6c7a\u307e\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u9806\u756a\u306b\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p><h3 class=\"wp-block-heading\">\u30c1\u30a7\u30c3\u30af1\uff1aanimation \u306b forwards \u3092\u5fd8\u308c\u3066\u3044\u306a\u3044\u304b<\/h3><p class=\"wp-block-paragraph\"><code>@keyframes<\/code> \u3067\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3092\u5b9f\u88c5\u3057\u305f\u5834\u5408\u3001<code>animation: fadeIn 1s ease<\/code> \u3060\u3051\u3067\u306f\u300c\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u7d42\u4e86\u5f8c\u306b\u5143\u306e\u72b6\u614b\uff08<code>opacity: 0<\/code>\uff09\u306b\u623b\u308b\u300d\u52d5\u4f5c\u306b\u306a\u308a\u307e\u3059\u3002\u5fc5\u305a <code>forwards<\/code> \u3092\u4ed8\u3051\u3066\u3001\u7d42\u4e86\u72b6\u614b\u3092\u7dad\u6301\u3055\u305b\u307e\u3057\u3087\u3046\u3002<\/p><ul class=\"wp-block-list\"><li>NG: <code>animation: fadeIn 1s ease;<\/code><\/li><li>OK: <code>animation: fadeIn 1s ease <strong>forwards<\/strong>;<\/code><\/li><\/ul><h3 class=\"wp-block-heading\">\u30c1\u30a7\u30c3\u30af2\uff1adisplay: none \u3068transition\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3044\u306a\u3044\u304b<\/h3><p class=\"wp-block-paragraph\"><code>display: none<\/code> \u306e\u8981\u7d20\u306b <code>transition<\/code> \u3092\u9069\u7528\u3057\u3066\u3082\u52d5\u304d\u307e\u305b\u3093\u3002<code>display<\/code> \u30d7\u30ed\u30d1\u30c6\u30a3\u81ea\u4f53\u304c <code>transition<\/code> \u306e\u5bfe\u8c61\u5916\u3060\u304b\u3089\u3067\u3059\u3002\u4ee3\u308f\u308a\u306b <code>opacity<\/code> \u3068 <code>visibility<\/code> \u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u3044\u307e\u3057\u3087\u3046\u3002<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* display: none\u3068transition\u306f\u4f75\u7528\u3067\u304d\u306a\u3044\uff01 *\/\n\n\/* NG\u4f8b *\/\n.wrong {\n  display: none;\n  transition: opacity 0.5s; \/* \u52b9\u304b\u306a\u3044 *\/\n}\n.wrong.is-visible {\n  display: block; \/* display\u5909\u66f4\u306ftransition\u3067\u304d\u306a\u3044 *\/\n  opacity: 1;\n}\n\n\/* OK\u4f8b\uff1avisibility\u3092\u4f7f\u3046 *\/\n.correct {\n  opacity: 0;\n  visibility: hidden; \/* \u30af\u30ea\u30c3\u30af\u3084\u30ad\u30fc\u30dc\u30fc\u30c9\u64cd\u4f5c\u3092\u7121\u52b9\u5316 *\/\n  transition: opacity 0.5s, visibility 0.5s;\n}\n.correct.is-visible {\n  opacity: 1;\n  visibility: visible;\n}<\/code><\/pre><\/div><h3 class=\"wp-block-heading\">\u30c1\u30a7\u30c3\u30af3\uff1a\u521d\u671f\u5024\u306eopacity\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u308b\u304b<\/h3><p class=\"wp-block-paragraph\"><code>transition<\/code> \u3092\u4f7f\u3046\u5834\u5408\u3001<code>.fade-target<\/code> \u306b <code>opacity: 0<\/code> \u3092\u660e\u793a\u3057\u3066\u3044\u306a\u3044\u3068\u300c\u6700\u521d\u304b\u3089\u898b\u3048\u3066\u3044\u308b\u72b6\u614b\u300d\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u59cb\u307e\u308a\u307e\u3059\u3002\u30af\u30e9\u30b9\u4ed8\u4e0e\u524d\u306e\u521d\u671f\u72b6\u614b\u3092\u5fc5\u305aCSS\u3067\u5b9a\u7fa9\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p><h3 class=\"wp-block-heading\">\u30c1\u30a7\u30c3\u30af4\uff1aJavaScript\u3067\u30af\u30e9\u30b9\u304c\u6b63\u3057\u304f\u4ed8\u4e0e\u3055\u308c\u3066\u3044\u308b\u304b<\/h3><p class=\"wp-block-paragraph\">\u30d6\u30e9\u30a6\u30b6\u306e\u958b\u767a\u8005\u30c4\u30fc\u30eb\u3067\u5bfe\u8c61\u8981\u7d20\u3092\u9078\u629e\u3057\u3001\u300cElements\u300d\u30bf\u30d6\u3067 <code>is-visible<\/code> \u30af\u30e9\u30b9\u304c\u4ed8\u3044\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u307e\u3059\u3002\u4ed8\u3044\u3066\u3044\u306a\u3044\u5834\u5408\u306fJavaScript\u5074\u306e\u30bb\u30ec\u30af\u30bf\u3084\u30bf\u30a4\u30df\u30f3\u30b0\u306e\u554f\u984c\u3067\u3059\u3002<\/p><ul class=\"wp-block-list\"><li>\u30bb\u30ec\u30af\u30bf\u306e\u30b9\u30da\u30eb\u30df\u30b9\u304c\u306a\u3044\u304b\u78ba\u8a8d\uff08\u30af\u30e9\u30b9\u540d\u306e\u30bf\u30a4\u30dd\uff09<\/li><li><code>DOMContentLoaded<\/code> \u3088\u308a\u524d\u306b\u30b9\u30af\u30ea\u30d7\u30c8\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u306a\u3044\u304b<\/li><li>Intersection Observer\u306e <code>observe()<\/code> \u304c\u6b63\u3057\u304f\u547c\u3070\u308c\u3066\u3044\u308b\u304b<\/li><\/ul><h3 class=\"wp-block-heading\">\u30c1\u30a7\u30c3\u30af5\uff1aCSS\u306e\u8a73\u7d30\u5ea6\uff08specificity\uff09\u3067\u4e0a\u66f8\u304d\u3055\u308c\u3066\u3044\u306a\u3044\u304b<\/h3><p class=\"wp-block-paragraph\">\u4ed6\u306eCSS\u304c <code>opacity: 1 !important<\/code> \u3067\u4e0a\u66f8\u304d\u3057\u3066\u3044\u305f\u308a\u3001\u9006\u306b <code>opacity: 0<\/code> \u304c\u5225\u306e\u30eb\u30fc\u30eb\u3067\u56fa\u5b9a\u3055\u308c\u3066\u3044\u305f\u308a\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u958b\u767a\u8005\u30c4\u30fc\u30eb\u306e\u300cComputed\u300d\u30bf\u30d6\u3067\u6700\u7d42\u7684\u306b\u9069\u7528\u3055\u308c\u3066\u3044\u308b\u5024\u3092\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p><h3 class=\"wp-block-heading\">\u30c1\u30a7\u30c3\u30af6\uff1az-index\u3084position\u304c\u5f71\u97ff\u3057\u3066\u3044\u306a\u3044\u304b<\/h3><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* z-index\u304c\u52b9\u304b\u306a\u3044\u539f\u56e0\u3042\u308b\u3042\u308b\uff1aposition\u3092\u5fd8\u308c\u3066\u3044\u308b *\/\n.overlay {\n  position: relative; \/* \u3053\u308c\u304c\u306a\u3044\u3068z-index\u304c\u52b9\u304b\u306a\u3044 *\/\n  z-index: 10;\n  opacity: 0;\n  transition: opacity 0.5s;\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\"><code>z-index<\/code> \u306e\u554f\u984c\u3067\u8981\u7d20\u304c\u4ed6\u306e\u8981\u7d20\u306e\u88cf\u5074\u306b\u96a0\u308c\u3066\u3044\u308b\u30b1\u30fc\u30b9\u3082\u3042\u308a\u307e\u3059\u3002<code>z-index<\/code> \u3092\u4f7f\u3046\u5834\u5408\u306f\u5fc5\u305a <code>position: relative \/ absolute \/ fixed<\/code> \u306e\u3044\u305a\u308c\u304b\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3092\u899a\u3048\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p><h3 class=\"wp-block-heading\">\u30c1\u30a7\u30c3\u30af7\uff1awill-change\u3067\u5bfe\u5fdc\u3067\u304d\u308b\u304b\u3082<\/h3><p class=\"wp-block-paragraph\">\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u300c\u30ab\u30af\u3064\u304f\u300d\u300c\u3061\u3089\u3064\u304f\u300d\u5834\u5408\u306f\u3001GPU\u30a2\u30af\u30bb\u30e9\u30ec\u30fc\u30b7\u30e7\u30f3\u304c\u52b9\u3044\u3066\u3044\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<code>will-change<\/code> \u3092\u4f7f\u3063\u3066\u30d6\u30e9\u30a6\u30b6\u306b\u4e8b\u524d\u901a\u77e5\u3059\u308b\u3053\u3068\u3067\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u6539\u5584\u3055\u308c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p><div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6539\u5584\uff1awill-change\u3067\u4e8b\u524d\u306bGPU\u63cf\u753b\u3092\u6709\u52b9\u5316 *\/\n.fade-in {\n  will-change: opacity, transform;\n  opacity: 0;\n  transition: opacity 0.8s ease-out, transform 0.8s ease-out;\n}\n\n\/* \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u5b8c\u4e86\u5f8c\u306fwill-change\u3092\u5916\u3059 *\/\n.fade-in.is-visible {\n  opacity: 1;\n  transform: none;\n  will-change: auto;\n}<\/code><\/pre><\/div><p class=\"wp-block-paragraph\"><code>will-change<\/code> \u3092\u4ed8\u3051\u3059\u304e\u308b\u3068\u30e1\u30e2\u30ea\u6d88\u8cbb\u304c\u5897\u3048\u308b\u305f\u3081\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3059\u308b\u8981\u7d20\u3060\u3051\u306b\u7d5e\u3063\u3066\u304f\u3060\u3055\u3044\u3002\u4f7f\u3044\u7d42\u308f\u3063\u305f\u3089 <code>will-change: auto<\/code> \u306b\u623b\u3059\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p><h3 class=\"wp-block-heading\">\u307e\u3068\u3081\uff1a\u3088\u304f\u3042\u308b\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5\u65e9\u898b\u8868<\/h3><figure class=\"wp-block-table\"><table><thead><tr><th>\u75c7\u72b6<\/th><th>\u3088\u304f\u3042\u308b\u539f\u56e0<\/th><th>\u5bfe\u51e6\u6cd5<\/th><\/tr><\/thead><tbody><tr><td>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3057\u306a\u3044<\/td><td>display: none \u3068 transition \u3092\u4f75\u7528<\/td><td>visibility + opacity \u306b\u5909\u66f4<\/td><\/tr><tr><td>\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u5f8c\u306b\u6d88\u3048\u308b<\/td><td>forwards \u306e\u6307\u5b9a\u5fd8\u308c<\/td><td>animation \u306b forwards \u3092\u8ffd\u52a0<\/td><\/tr><tr><td>\u6700\u521d\u304b\u3089\u898b\u3048\u3066\u3044\u308b<\/td><td>\u521d\u671f\u5024\u306eopacity: 0\u304c\u672a\u8a2d\u5b9a<\/td><td>CSS\u306b opacity: 0 \u3092\u660e\u793a<\/td><\/tr><tr><td>\u30af\u30e9\u30b9\u304c\u4ed8\u304b\u306a\u3044<\/td><td>JS \u306e\u30bb\u30ec\u30af\u30bf\u30df\u30b9\u30fb\u30bf\u30a4\u30df\u30f3\u30b0\u554f\u984c<\/td><td>\u958b\u767a\u8005\u30c4\u30fc\u30eb\u3067DOM\u3092\u78ba\u8a8d<\/td><\/tr><tr><td>\u30ab\u30af\u30ab\u30af\u3059\u308b<\/td><td>GPU\u30a2\u30af\u30bb\u30e9\u30ec\u30fc\u30b7\u30e7\u30f3\u672a\u9069\u7528<\/td><td>will-change: opacity, transform \u3092\u8ffd\u52a0<\/td><\/tr><tr><td>\u4e00\u90e8\u306e\u30d6\u30e9\u30a6\u30b6\u3060\u3051\u52b9\u304b\u306a\u3044<\/td><td>animation-timeline \u672a\u5bfe\u5fdc<\/td><td>@supports \u3067\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u5b9f\u88c5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n<!-- withmedia-faq -->\n\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09<\/h2>\n\n<h3 class=\"wp-block-heading\">CSS\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3068\u306f\u3069\u3046\u3044\u3046\u610f\u5473\u3067\u3059\u304b\uff1f<\/h3>\n\n<p class=\"wp-block-paragraph\">CSS\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3068\u306f\u3001\u8981\u7d20\u306e\u900f\u660e\u5ea6\uff08opacity\uff09\u30920\uff08\u5b8c\u5168\u306b\u900f\u660e\uff09\u304b\u30891\uff08\u5b8c\u5168\u306b\u4e0d\u900f\u660e\uff09\u3078CSS\u306e\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u6a5f\u80fd\u3067\u5909\u5316\u3055\u305b\u308b\u3053\u3068\u3067\u3001\u8981\u7d20\u304c\u3075\u308f\u3063\u3068\u73fe\u308c\u308b\u8996\u899a\u52b9\u679c\u306e\u3053\u3068\u3067\u3059\u3002@keyframes\u3084transition\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3063\u3066\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n\n<h3 class=\"wp-block-heading\">\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3059\u308b\u306b\u306fJavaScript\u304c\u5fc5\u8981\u3067\u3059\u304b\uff1f<\/h3>\n\n<p class=\"wp-block-paragraph\">\u57fa\u672c\u7684\u306b\u306fIntersection Observer API\u3068\u3044\u3046\u5c11\u91cf\u306eJavaScript\u304c\u5fc5\u8981\u3067\u3059\u3002\u305f\u3060\u3057\u3001Chrome\u30fbEdge\u30fbFirefox\u306e\u6700\u65b0\u7248\u3067\u3042\u308c\u3070CSS\u306eanimation-timeline: view()\u3092\u4f7f\u3046\u3053\u3068\u3067JavaScript\u306a\u3057\u3067\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002Safari\u306e\u5bfe\u5fdc\u304c\u5b8c\u5168\u3067\u306a\u3044\u305f\u3081\u3001\u672c\u756a\u74b0\u5883\u3067\u306f@supports\u3067\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u7528\u610f\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002<\/p>\n\n<h3 class=\"wp-block-heading\">css\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3067\u4e0b\u304b\u3089\u3075\u308f\u3063\u3068\u8868\u793a\u3059\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n<p class=\"wp-block-paragraph\">\u521d\u671f\u72b6\u614b\u306bopacity: 0\u3068transform: translateY(40px)\u3092\u6307\u5b9a\u3057\u3001\u8868\u793a\u72b6\u614b\u3067\u306fopacity: 1\u3068transform: translateY(0)\u306b\u3059\u308b\u3053\u3068\u3067\u5b9f\u73fe\u3057\u307e\u3059\u3002transition\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u5909\u5316\u306e\u6642\u9593\u3068\u30a4\u30fc\u30b8\u30f3\u30b0\u3092\u8a2d\u5b9a\u3057\u3001Intersection Observer\u3067\u30b9\u30af\u30ed\u30fc\u30eb\u6642\u306b\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3059\u308b\u306e\u304c\u5b9a\u756a\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002<\/p>\n\n<h3 class=\"wp-block-heading\">\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u52b9\u304b\u306a\u3044\u306e\u306f\u306a\u305c\u3067\u3059\u304b\uff1f<\/h3>\n\n<p class=\"wp-block-paragraph\">\u3088\u304f\u3042\u308b\u539f\u56e0\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002\u2460@keyframes\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306bforwards\u3092\u5fd8\u308c\u305f\uff08\u7d42\u4e86\u5f8c\u306b\u5143\u306b\u623b\u308b\uff09\u3001\u2461display: none\u3068transition\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3044\u308b\uff08display\u306ftransition\u4e0d\u53ef\uff09\u3001\u2462\u521d\u671f\u5024\u306eopacity: 0\u304c\u672a\u6307\u5b9a\u3001\u2463JavaScript\u306e\u30bb\u30ec\u30af\u30bf\u30df\u30b9\u3067\u30af\u30e9\u30b9\u304c\u4ed8\u4e0e\u3055\u308c\u3066\u3044\u306a\u3044\u3001\u306e4\u70b9\u3092\u9806\u756a\u306b\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n<h3 class=\"wp-block-heading\">\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u82e6\u624b\u3068\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u914d\u616e\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n<p class=\"wp-block-paragraph\">CSS\u306eprefers-reduced-motion\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u4f7f\u3044\u307e\u3059\u3002@media (prefers-reduced-motion: reduce)\u30d6\u30ed\u30c3\u30af\u5185\u3067animation: none\u3092\u6307\u5b9a\u3057\u3001opacity: 1\u3068transform: none\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u52d5\u304d\u3092\u6e1b\u3089\u3059\u8a2d\u5b9a\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u306f\u5373\u6642\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u5bfe\u5fdc\u3068\u3057\u3066\u5fc5\u9808\u306e\u5b9f\u88c5\u3067\u3059\u3002<\/p>\n\n\n\n<!-- withmedia-faq-schema -->\n<script type=\"application\/ld+json\">{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": 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\"text\": \"\u57fa\u672c\u7684\u306b\u306fIntersection Observer API\u3068\u3044\u3046\u5c11\u91cf\u306eJavaScript\u304c\u5fc5\u8981\u3067\u3059\u3002\u305f\u3060\u3057\u3001Chrome\u30fbEdge\u30fbFirefox\u306e\u6700\u65b0\u7248\u3067\u3042\u308c\u3070CSS\u306eanimation-timeline: view()\u3092\u4f7f\u3046\u3053\u3068\u3067JavaScript\u306a\u3057\u3067\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002Safari\u306e\u5bfe\u5fdc\u304c\u5b8c\u5168\u3067\u306a\u3044\u305f\u3081\u3001\u672c\u756a\u74b0\u5883\u3067\u306f@supports\u3067\u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af\u3092\u7528\u610f\u3059\u308b\u3053\u3068\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002\"}}, {\"@type\": \"Question\", \"name\": \"css\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3067\u4e0b\u304b\u3089\u3075\u308f\u3063\u3068\u8868\u793a\u3059\u308b\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"\u521d\u671f\u72b6\u614b\u306bopacity: 0\u3068transform: translateY(40px)\u3092\u6307\u5b9a\u3057\u3001\u8868\u793a\u72b6\u614b\u3067\u306fopacity: 1\u3068transform: translateY(0)\u306b\u3059\u308b\u3053\u3068\u3067\u5b9f\u73fe\u3057\u307e\u3059\u3002transition\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u5909\u5316\u306e\u6642\u9593\u3068\u30a4\u30fc\u30b8\u30f3\u30b0\u3092\u8a2d\u5b9a\u3057\u3001Intersection Observer\u3067\u30b9\u30af\u30ed\u30fc\u30eb\u6642\u306b\u30af\u30e9\u30b9\u3092\u4ed8\u4e0e\u3059\u308b\u306e\u304c\u5b9a\u756a\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\"}}, {\"@type\": \"Question\", \"name\": \"\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u52b9\u304b\u306a\u3044\u306e\u306f\u306a\u305c\u3067\u3059\u304b\uff1f\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"\u3088\u304f\u3042\u308b\u539f\u56e0\u306f\u3044\u304f\u3064\u304b\u3042\u308a\u307e\u3059\u3002\u2460@keyframes\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306bforwards\u3092\u5fd8\u308c\u305f\uff08\u7d42\u4e86\u5f8c\u306b\u5143\u306b\u623b\u308b\uff09\u3001\u2461display: none\u3068transition\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3044\u308b\uff08display\u306ftransition\u4e0d\u53ef\uff09\u3001\u2462\u521d\u671f\u5024\u306eopacity: 0\u304c\u672a\u6307\u5b9a\u3001\u2463JavaScript\u306e\u30bb\u30ec\u30af\u30bf\u30df\u30b9\u3067\u30af\u30e9\u30b9\u304c\u4ed8\u4e0e\u3055\u308c\u3066\u3044\u306a\u3044\u3001\u306e4\u70b9\u3092\u9806\u756a\u306b\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002\"}}, {\"@type\": \"Question\", \"name\": \"\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u82e6\u624b\u3068\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u3078\u306e\u914d\u616e\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"CSS\u306eprefers-reduced-motion\u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea\u3092\u4f7f\u3044\u307e\u3059\u3002@media (prefers-reduced-motion: reduce)\u30d6\u30ed\u30c3\u30af\u5185\u3067animation: none\u3092\u6307\u5b9a\u3057\u3001opacity: 1\u3068transform: none\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u52d5\u304d\u3092\u6e1b\u3089\u3059\u8a2d\u5b9a\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u306f\u5373\u6642\u8868\u793a\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u5bfe\u5fdc\u3068\u3057\u3066\u5fc5\u9808\u306e\u5b9f\u88c5\u3067\u3059\u3002\"}}]}<\/script>\n\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\/css-transition\/\">\u30102026\u5e74\u7248\u3011CSS 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