{"id":19269,"date":"2026-07-28T13:57:27","date_gmt":"2026-07-28T13:57:27","guid":{"rendered":"https:\/\/withcode.tech\/media\/?p=19269"},"modified":"2026-07-28T14:59:45","modified_gmt":"2026-07-28T14:59:45","slug":"css-text-animation","status":"publish","type":"post","link":"https:\/\/withcode.tech\/media\/css-text-animation\/","title":{"rendered":"CSS\u30c6\u30ad\u30b9\u30c8\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u96c6\uff5c\u3075\u308f\u3063\u3068\u51fa\u308b\u6587\u5b57\u6f14\u51fa\u3092\u30b3\u30d4\u30da"},"content":{"rendered":"<p><!-- roam:retrofit18209 --><\/p>\n<div class=\"swell-block-balloon\">\n<div class=\"c-balloon -bln-left\" data-col=\"gray\">\n<div class=\"c-balloon__icon -square\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.40.37.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div>\n<div class=\"c-balloon__body -speaking -border-none\">\n<div class=\"c-balloon__text\">\n<p><strong>\u898b\u51fa\u3057\u306e\u6587\u5b57\u3092\u3075\u308f\u3063\u3068\u8868\u793a\u3055\u305b\u305f\u3044\u3093\u3067\u3059\u304c\u3001JavaScript\u304c\u5fc5\u8981\u3067\u3059\u3088\u306d\uff1f\u96e3\u3057\u305d\u3046\u2026<\/strong><\/p>\n<p><span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"swell-block-balloon\">\n<div class=\"c-balloon -bln-right\" data-col=\"gray\">\n<div class=\"c-balloon__icon -square\"><img decoding=\"async\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div>\n<div class=\"c-balloon__body -speaking -border-none\">\n<div class=\"c-balloon__text\">\n<p><strong>\u3046\u3046\u3093\u3001CSS\u3060\u3051\u3067OK\u3060\u3088\uff01@keyframes\u3068opacity\u30fbtransform\u3092\u7d44\u307f\u5408\u308f\u305b\u308c\u3070\u3001\u30b3\u30d4\u30da\u3067\u6587\u5b57\u304c\u3075\u308f\u3063\u3068\u51fa\u308b\u6f14\u51fa\u304c\u4f5c\u308c\u308b\u3002\u4eca\u65e5\u306f\u5b9a\u756a\u30d1\u30bf\u30fc\u30f3\u3092\u5168\u90e8\u6e21\u3059\u306d\u3002<\/strong><\/p>\n<p><span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<p class=\"wp-block-paragraph\">\u300c\u30b5\u30a4\u30c8\u3092\u958b\u3044\u305f\u3068\u304d\u3001\u30bf\u30a4\u30c8\u30eb\u304c\u3075\u308f\u3063\u3068\u73fe\u308c\u308b\u6f14\u51fa\u306b\u3057\u305f\u3044\u300d\u300c\u6587\u5b57\u304c1\u6587\u5b57\u305a\u3064\u9806\u756a\u306b\u51fa\u3066\u304f\u308b\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u5b9f\u88c5\u3057\u305f\u3044\u300d\u2014\u2014\u305d\u3046\u601d\u3063\u3066CSS\u3092\u8abf\u3079\u59cb\u3081\u305f\u3082\u306e\u306e\u3001<strong><span class=\"swl-marker mark_yellow\">\u3069\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u7d44\u307f\u5408\u308f\u305b\u308c\u3070\u3044\u3044\u304b\u5206\u304b\u3089\u306a\u3044<\/span><\/strong>\u3068\u611f\u3058\u305f\u7d4c\u9a13\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p class=\"wp-block-paragraph\">CSS\u306e\u30c6\u30ad\u30b9\u30c8\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306f\u3001JavaScript\u3092\u4f7f\u308f\u306a\u304f\u3066\u3082\u9a5a\u304f\u307b\u3069\u591a\u5f69\u306a\u8868\u73fe\u304c\u53ef\u80fd\u3067\u3059\u3002\u305f\u3060\u3057\u300c\u3069\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u3069\u3046\u7d44\u307f\u5408\u308f\u305b\u308b\u304b\u300d\u3068\u3044\u3046\u30d1\u30bf\u30fc\u30f3\u3092\u77e5\u3089\u306a\u3044\u3068\u3001\u601d\u3044\u901a\u308a\u306e\u52d5\u304d\u3092\u4f5c\u308b\u306e\u306b\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002<\/p>\n<p class=\"wp-block-paragraph\">\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001Web\u30b5\u30a4\u30c8\u3067\u5b9f\u969b\u306b\u3088\u304f\u4f7f\u308f\u308c\u308bCSS\u30c6\u30ad\u30b9\u30c8\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u309210\u7a2e\u985e\u4ee5\u4e0a\u3001\u3059\u3079\u3066\u30b3\u30d4\u30da\u3067\u304d\u308b\u5b8c\u6210\u30b3\u30fc\u30c9\u3068\u3068\u3082\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u57fa\u672c\u7684\u306a\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u8868\u793a\u304b\u3089\u30011\u6587\u5b57\u305a\u3064\u6642\u9593\u5dee\u3067\u51fa\u73fe\u3055\u305b\u308b\u65b9\u6cd5\u3001\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u6587\u5b57\u3001\u30cd\u30aa\u30f3\u767a\u5149\u52b9\u679c\u307e\u3067\u5e45\u5e83\u304f\u30ab\u30d0\u30fc\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p class=\"wp-block-paragraph\">\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u5bfe\u5fdc\uff08prefers-reduced-motion\uff09\u306b\u3064\u3044\u3066\u3082\u5fc5\u305a\u89e6\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u5b9f\u6848\u4ef6\u3067\u305d\u306e\u307e\u307e\u4f7f\u3048\u308b\u5185\u5bb9\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul class=\"wp-block-list\">\n<li>opacity + transform \u3067\u3075\u308f\u3063\u3068\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3055\u305b\u308b\u57fa\u672c\u30d1\u30bf\u30fc\u30f3<\/li>\n<li>@keyframes \u3067\u4e0b\u304b\u3089\u30fb\u4e0a\u304b\u3089\u30fb\u6a2a\u304b\u3089\u30b9\u30e9\u30a4\u30c9\u30a4\u30f3\u3055\u305b\u308b\u65b9\u6cd5<\/li>\n<li>animation-delay \u3092\u4f7f\u3063\u305f1\u6587\u5b57\u305a\u3064\u6642\u9593\u5dee\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\uff08span\u5206\u5272\uff09<\/li>\n<li>background-clip: text \u3067\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u6587\u5b57\u3092\u4f5c\u308b\u624b\u9806<\/li>\n<li>text-shadow \u3092\u91cd\u306d\u3066\u30cd\u30aa\u30f3\u767a\u5149\u30c6\u30ad\u30b9\u30c8\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5<\/li>\n<li>prefers-reduced-motion \u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u5b89\u5168\u306b\u5236\u5fa1\u3059\u308b\u65b9\u6cd5<\/li>\n<\/ul>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">CSS\u30c6\u30ad\u30b9\u30c8\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u57fa\u672c\uff1aopacity + transform<\/h2>\n<figure class=\"wp-block-image size-large\" data-dia=\"19269-1\"><img decoding=\"async\" width=\"1568\" height=\"389\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-1.png\" alt=\"\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u306e\u57fa\u672c\u30d5\u30ed\u30fc\" class=\"wp-image-19370\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-1.png 1568w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-1-768x191.png 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-1-1536x381.png 1536w\" sizes=\"(max-width: 1568px) 100vw, 1568px\" \/><\/figure>\n<p class=\"wp-block-paragraph\">\u30c6\u30ad\u30b9\u30c8\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u4e2d\u3067\u3082\u3063\u3068\u3082\u6c4e\u7528\u6027\u304c\u9ad8\u3044\u306e\u304c\u3001<strong><span class=\"swl-marker mark_yellow\">opacity \u3068 transform \u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3<\/span><\/strong>\u3067\u3059\u3002\u8981\u7d20\u3092\u6700\u521d\u306f\u900f\u660e\u30fb\u5c11\u3057\u4e0b\u306b\u305a\u3089\u3057\u305f\u72b6\u614b\u304b\u3089\u59cb\u3081\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3067\u5143\u306e\u4f4d\u7f6e\u306b\u623b\u3057\u306a\u304c\u3089\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n<p class=\"wp-block-paragraph\">opacity \u3068 transform \u306f\u3069\u3061\u3089\u3082GPU\u3067\u51e6\u7406\u3055\u308c\u308b\u305f\u3081\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u7684\u306b\u512a\u308c\u3066\u3044\u307e\u3059\u3002will-change \u3092\u5fc5\u8981\u4ee5\u4e0a\u306b\u4f7f\u308f\u306a\u304f\u3066\u3082\u3001\u30b9\u30e0\u30fc\u30ba\u306b\u52d5\u304d\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u306e\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\uff08\u4e0b\u304b\u3089\u51fa\u73fe\uff09<\/h3>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u57fa\u672c\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\uff1a\u4e0b\u304b\u3089\u51fa\u73fe *\/\n.fade-in-up {\n  opacity: 0;\n  transform: translateY(30px);\n  animation: fadeInUp 0.6s ease forwards;\n}\n\n@keyframes fadeInUp {\n  to {\n    opacity: 1;\n    transform: translateY(0);\n  }\n}\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;p class=&quot;fade-in-up&quot;&gt;\u3075\u308f\u3063\u3068\u4e0b\u304b\u3089\u51fa\u73fe\u3059\u308b\u30c6\u30ad\u30b9\u30c8&lt;\/p&gt;\n<\/code><\/pre>\n<\/div>\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">animation: forwards<\/span><\/strong> \u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u7d42\u4e86\u5f8c\u3082\u6700\u7d42\u72b6\u614b\uff08opacity: 1\uff09\u304c\u7dad\u6301\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u3092\u5fd8\u308c\u308b\u3068\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u7d42\u4e86\u5f8c\u306b\u5143\u306e\u900f\u660e\u72b6\u614b\u306b\u623b\u3063\u3066\u3057\u307e\u3046\u306e\u3067\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u4e0a\u304b\u3089\u30fb\u6a2a\u304b\u3089\u306e\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3<\/h3>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u4e0a\u304b\u3089\u51fa\u73fe *\/\n.fade-in-down {\n  opacity: 0;\n  transform: translateY(-30px);\n  animation: fadeInDown 0.6s ease forwards;\n}\n\n@keyframes fadeInDown {\n  to {\n    opacity: 1;\n    transform: translateY(0);\n  }\n}\n\n\/* \u5de6\u304b\u3089\u51fa\u73fe *\/\n.fade-in-left {\n  opacity: 0;\n  transform: translateX(-40px);\n  animation: fadeInLeft 0.7s ease forwards;\n}\n\n@keyframes fadeInLeft {\n  to {\n    opacity: 1;\n    transform: translateX(0);\n  }\n}\n\n\/* \u53f3\u304b\u3089\u51fa\u73fe *\/\n.fade-in-right {\n  opacity: 0;\n  transform: translateX(40px);\n  animation: fadeInRight 0.7s ease forwards;\n}\n\n@keyframes fadeInRight {\n  to {\n    opacity: 1;\n    transform: translateX(0);\n  }\n}\n<\/code><\/pre>\n<\/div>\n<h3 class=\"wp-block-heading\">\u9045\u5ef6\u6307\u5b9a\u3067\u8907\u6570\u30c6\u30ad\u30b9\u30c8\u3092\u9806\u756a\u306b\u8868\u793a<\/h3>\n<p class=\"wp-block-paragraph\">\u898b\u51fa\u3057\u3068\u30b5\u30d6\u30c6\u30ad\u30b9\u30c8\u3092\u9023\u7d9a\u3057\u3066\u8868\u793a\u3057\u305f\u3044\u3068\u304d\u306f\u3001animation-delay \u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.hero-title {\n  opacity: 0;\n  transform: translateY(20px);\n  animation: fadeInUp 0.6s ease forwards;\n}\n\n.hero-subtitle {\n  opacity: 0;\n  transform: translateY(20px);\n  animation: fadeInUp 0.6s ease 0.3s forwards; \/* 0.3\u79d2\u9045\u5ef6 *\/\n}\n\n.hero-button {\n  opacity: 0;\n  transform: translateY(20px);\n  animation: fadeInUp 0.6s ease 0.6s forwards; \/* 0.6\u79d2\u9045\u5ef6 *\/\n}\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;section class=&quot;hero&quot;&gt;\n  &lt;h1 class=&quot;hero-title&quot;&gt;\u30e1\u30a4\u30f3\u30bf\u30a4\u30c8\u30eb&lt;\/h1&gt;\n  &lt;p class=&quot;hero-subtitle&quot;&gt;\u30b5\u30d6\u30c6\u30ad\u30b9\u30c8\u304c\u5c11\u3057\u9045\u308c\u3066\u767b\u5834\u3057\u307e\u3059&lt;\/p&gt;\n  &lt;a class=&quot;hero-button&quot; href=&quot;#&quot;&gt;\u3055\u3089\u306b\u8a73\u3057\u304f&lt;\/a&gt;\n&lt;\/section&gt;\n<\/code><\/pre>\n<\/div>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u30b9\u30b1\u30fc\u30eb\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3067\u6587\u5b57\u3092\u62e1\u5927\u8868\u793a<\/h2>\n<p class=\"wp-block-paragraph\">\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u3068\u7d44\u307f\u5408\u308f\u305b\u3066 transform: scale() \u3092\u4f7f\u3046\u3068\u3001\u6587\u5b57\u304c\u300c\u3071\u3063\u3068\u5e83\u304c\u308b\u300d\u3088\u3046\u306a\u6f14\u51fa\u3092\u4f5c\u308c\u307e\u3059\u3002\u30ed\u30b4\u3084\u5927\u898b\u51fa\u3057\u306b\u52b9\u679c\u7684\u3067\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u30b9\u30b1\u30fc\u30eb\u30a2\u30c3\u30d7\u3067\u767b\u5834 *\/\n.scale-in {\n  opacity: 0;\n  transform: scale(0.8);\n  animation: scaleIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;\n}\n\n@keyframes scaleIn {\n  to {\n    opacity: 1;\n    transform: scale(1);\n  }\n}\n\n\/* \u30b9\u30b1\u30fc\u30eb\u30c0\u30a6\u30f3\u3067\u767b\u5834\uff08\u5927\u304d\u3044\u72b6\u614b\u304b\u3089\u7e2e\u3080\uff09 *\/\n.scale-in-large {\n  opacity: 0;\n  transform: scale(1.2);\n  animation: scaleInLarge 0.6s ease forwards;\n}\n\n@keyframes scaleInLarge {\n  to {\n    opacity: 1;\n    transform: scale(1);\n  }\n}\n<\/code><\/pre>\n<\/div>\n<p class=\"wp-block-paragraph\">cubic-bezier(0.34, 1.56, 0.64, 1) \u306f\u3044\u308f\u3086\u308b\u300c\u30d0\u30a6\u30f3\u30b9\u300d\u30a4\u30fc\u30b8\u30f3\u30b0\u3067\u3001\u7d42\u70b9\u3092\u308f\u305a\u304b\u306b\u8d85\u3048\u3066\u304b\u3089\u843d\u3061\u7740\u304f\u305f\u3081\u3001\u751f\u304d\u751f\u304d\u3068\u3057\u305f\u52d5\u304d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">1\u6587\u5b57\u305a\u3064\u6642\u9593\u5dee\u3067\u51fa\u73fe\u3055\u305b\u308b\uff08animation-delay + span\u5206\u5272\uff09<\/h2>\n<p class=\"wp-block-paragraph\">\u300c\u6587\u5b57\u304c\u5de6\u304b\u30891\u6587\u5b57\u305a\u3064\u9806\u756a\u306b\u51fa\u3066\u304f\u308b\u300d\u6f14\u51fa\u306f\u3001<strong><span class=\"swl-marker mark_yellow\">\u30c6\u30ad\u30b9\u30c8\u30921\u6587\u5b57\u3054\u3068\u306bspan\u3067\u56f2\u307f\u3001\u305d\u308c\u305e\u308c\u306banimation-delay\u3092\u8a2d\u5b9a<\/span><\/strong>\u3059\u308b\u3053\u3068\u3067\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">HTML\u3092\u624b\u52d5\u3067span\u5206\u5272\u3059\u308b\u65b9\u6cd5<\/h3>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.char-animation span {\n  display: inline-block;\n  opacity: 0;\n  transform: translateY(20px);\n  animation: charFadeIn 0.4s ease forwards;\n}\n\n\/* nth-child\u3067\u5404\u6587\u5b57\u306b\u9045\u5ef6\u3092\u8a2d\u5b9a *\/\n.char-animation span:nth-child(1)  { animation-delay: 0.05s; }\n.char-animation span:nth-child(2)  { animation-delay: 0.10s; }\n.char-animation span:nth-child(3)  { animation-delay: 0.15s; }\n.char-animation span:nth-child(4)  { animation-delay: 0.20s; }\n.char-animation span:nth-child(5)  { animation-delay: 0.25s; }\n.char-animation span:nth-child(6)  { animation-delay: 0.30s; }\n.char-animation span:nth-child(7)  { animation-delay: 0.35s; }\n.char-animation span:nth-child(8)  { animation-delay: 0.40s; }\n.char-animation span:nth-child(9)  { animation-delay: 0.45s; }\n.char-animation span:nth-child(10) { animation-delay: 0.50s; }\n\n@keyframes charFadeIn {\n  to {\n    opacity: 1;\n    transform: translateY(0);\n  }\n}\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;h1 class=&quot;char-animation&quot;&gt;\n  &lt;span&gt;W&lt;\/span&gt;&lt;span&gt;i&lt;\/span&gt;&lt;span&gt;t&lt;\/span&gt;&lt;span&gt;h&lt;\/span&gt;\n  &lt;span&gt;C&lt;\/span&gt;&lt;span&gt;o&lt;\/span&gt;&lt;span&gt;d&lt;\/span&gt;&lt;span&gt;e&lt;\/span&gt;\n&lt;\/h1&gt;\n<\/code><\/pre>\n<\/div>\n<h3 class=\"wp-block-heading\">JavaScript\u3067\u81ea\u52d5span\u5206\u5272\u3059\u308b\u65b9\u6cd5<\/h3>\n<p class=\"wp-block-paragraph\">\u6587\u5b57\u6570\u304c\u591a\u3044\u5834\u5408\u3084\u52d5\u7684\u306a\u30c6\u30ad\u30b9\u30c8\u306b\u5bfe\u5fdc\u3059\u308b\u306b\u306f\u3001JavaScript\u3067\u81ea\u52d5\u5206\u5272\u3059\u308b\u306e\u304c\u73fe\u5b9f\u7684\u3067\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-javascript\" data-lang=\"JavaScript\"><code>\/\/ \u30c6\u30ad\u30b9\u30c8\u30921\u6587\u5b57\u305a\u3064span\u306b\u5206\u5272\u3057\u3066\u9045\u5ef6\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\ndocument.querySelectorAll('.js-char-split').forEach(el => {\n  const text = el.textContent;\n  el.innerHTML = text\n    .split('')\n    .map((char, i) => {\n      const delay = (i * 0.05).toFixed(2);\n      const display = char === ' ' ? '&amp;nbsp;' : char;\n      return `&lt;span style=&quot;animation-delay:${delay}s&quot;&gt;${display}&lt;\/span&gt;`;\n    })\n    .join('');\n});\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.js-char-split span {\n  display: inline-block;\n  opacity: 0;\n  transform: translateY(15px);\n  animation: charFadeIn 0.4s ease forwards;\n}\n\n@keyframes charFadeIn {\n  to {\n    opacity: 1;\n    transform: translateY(0);\n  }\n}\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;!-- \u30af\u30e9\u30b9\u3092\u4ed8\u3051\u308b\u3060\u3051\u3067OK --&gt;\n&lt;h2 class=&quot;js-char-split&quot;&gt;1\u6587\u5b57\u305a\u3064\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3&lt;\/h2&gt;\n<\/code><\/pre>\n<\/div>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u6587\u5b57\u3092\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3055\u305b\u308b\uff08background-clip: text\uff09<\/h2>\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">background-clip: text \u3068 -webkit-text-fill-color: transparent<\/span><\/strong> \u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001\u30c6\u30ad\u30b9\u30c8\u90e8\u5206\u306b\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u8868\u793a\u3067\u304d\u307e\u3059\u3002\u3055\u3089\u306b\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u8272\u304c\u6d41\u308c\u308b\u3088\u3046\u306b\u5909\u5316\u3059\u308b\u6f14\u51fa\u304c\u4f5c\u308c\u307e\u3059\u3002<\/p>\n<h3 class=\"wp-block-heading\">\u57fa\u672c\u306e\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u6587\u5b57<\/h3>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.gradient-text {\n  background: linear-gradient(90deg, #ff6b6b, #ffa500, #ffef00, #6bff6b, #6b9fff, #a855f7);\n  background-size: 200% auto;\n  -webkit-background-clip: text;\n  background-clip: text;\n  -webkit-text-fill-color: transparent;\n  font-size: 3rem;\n  font-weight: bold;\n  animation: gradientShift 3s linear infinite;\n}\n\n@keyframes gradientShift {\n  0%   { background-position: 0% center; }\n  100% { background-position: 200% center; }\n}\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-html\" data-lang=\"HTML\"><code>&lt;h1 class=&quot;gradient-text&quot;&gt;\u30ab\u30e9\u30d5\u30eb\u306a\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u30c6\u30ad\u30b9\u30c8&lt;\/h1&gt;\n<\/code><\/pre>\n<\/div>\n<h3 class=\"wp-block-heading\">\u30d6\u30e9\u30f3\u30c9\u30ab\u30e9\u30fc\u3092\u4f7f\u3063\u305f2\u8272\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3<\/h3>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.brand-gradient-text {\n  background: linear-gradient(135deg, #d16176 0%, #a855f7 50%, #3b82f6 100%);\n  background-size: 200% 200%;\n  -webkit-background-clip: text;\n  background-clip: text;\n  -webkit-text-fill-color: transparent;\n  animation: brandGradient 4s ease infinite;\n}\n\n@keyframes brandGradient {\n  0%   { background-position: 0% 50%; }\n  50%  { background-position: 100% 50%; }\n  100% { background-position: 0% 50%; }\n}\n<\/code><\/pre>\n<\/div>\n<p class=\"wp-block-paragraph\">background-clip: text \u306f\u4e3b\u8981\u30d6\u30e9\u30a6\u30b6\u3067\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001<strong><span class=\"swl-marker mark_yellow\">-webkit- \u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3082\u5fc5\u305a\u66f8\u304f<\/span><\/strong>\u3088\u3046\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u306a\u3057\u3060\u3051\u3067\u306f\u4e00\u90e8\u306e\u74b0\u5883\u3067\u8868\u793a\u3055\u308c\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u30cd\u30aa\u30f3\u767a\u5149\u30c6\u30ad\u30b9\u30c8\uff08text-shadow \u306e\u91cd\u306d\u6280\uff09<\/h2>\n<p class=\"wp-block-paragraph\">\u30cd\u30aa\u30f3\u30b5\u30a4\u30f3\u98a8\u306e\u30b0\u30ed\u30fc\u52b9\u679c\u306f\u3001<strong><span class=\"swl-marker mark_yellow\">text-shadow \u3092\u8907\u6570\u91cd\u306d\u3066\u66f8\u304f<\/span><\/strong>\u3053\u3068\u3067\u8868\u73fe\u3057\u307e\u3059\u3002\u30d6\u30e9\u30fc\u3092\u5927\u304d\u304f\u3059\u308b\u307b\u3069\u5149\u304c\u5e83\u304c\u3063\u305f\u3088\u3046\u306b\u898b\u3048\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.neon-text {\n  color: #fff;\n  font-size: 2.5rem;\n  font-weight: bold;\n  letter-spacing: 0.1em;\n  text-shadow:\n    0 0 5px #fff,\n    0 0 10px #fff,\n    0 0 20px #ff0080,\n    0 0 40px #ff0080,\n    0 0 80px #ff0080;\n  animation: neonFlicker 2s infinite alternate;\n}\n\n@keyframes neonFlicker {\n  0%, 19%, 21%, 23%, 25%, 54%, 56%, 100% {\n    text-shadow:\n      0 0 5px #fff,\n      0 0 10px #fff,\n      0 0 20px #ff0080,\n      0 0 40px #ff0080,\n      0 0 80px #ff0080;\n  }\n  20%, 24%, 55% {\n    text-shadow: none;\n  }\n}\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u9752\u3044\u30cd\u30aa\u30f3\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3 *\/\n.neon-blue {\n  color: #e0f7ff;\n  text-shadow:\n    0 0 5px #e0f7ff,\n    0 0 10px #e0f7ff,\n    0 0 20px #00b4d8,\n    0 0 40px #00b4d8,\n    0 0 80px #0077b6;\n  animation: neonPulse 1.5s ease-in-out infinite alternate;\n}\n\n@keyframes neonPulse {\n  from {\n    text-shadow:\n      0 0 5px #e0f7ff,\n      0 0 10px #e0f7ff,\n      0 0 20px #00b4d8,\n      0 0 40px #00b4d8,\n      0 0 80px #0077b6;\n  }\n  to {\n    text-shadow:\n      0 0 2px #e0f7ff,\n      0 0 5px #e0f7ff,\n      0 0 10px #00b4d8,\n      0 0 20px #00b4d8,\n      0 0 40px #0077b6;\n  }\n}\n<\/code><\/pre>\n<\/div>\n<p class=\"wp-block-paragraph\">\u30cd\u30aa\u30f3\u6f14\u51fa\u306f\u80cc\u666f\u304c\u6697\u3044\u5834\u5408\u306b\u6620\u3048\u307e\u3059\u3002\u767d\u80cc\u666f\u3067\u306f\u307b\u307c\u52b9\u679c\u304c\u51fa\u306a\u3044\u306e\u3067\u3001dark \u30c6\u30fc\u30de\u3084\u6fc3\u8272\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u9650\u5b9a\u3057\u3066\u4f7f\u3046\u306e\u304c\u7121\u96e3\u3067\u3059\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u30c6\u30ad\u30b9\u30c8\u3092\u307c\u304b\u3057\u306a\u304c\u3089\u8868\u793a\uff08blur filter\uff09<\/h2>\n<p class=\"wp-block-paragraph\">filter: blur() \u3068opacity\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u3001\u9744\u306e\u4e2d\u304b\u3089\u6587\u5b57\u304c\u73fe\u308c\u308b\u3088\u3046\u306a\u5e7b\u60f3\u7684\u306a\u6f14\u51fa\u304c\u4f5c\u308c\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>.blur-in {\n  opacity: 0;\n  filter: blur(10px);\n  animation: blurIn 1s ease forwards;\n}\n\n@keyframes blurIn {\n  to {\n    opacity: 1;\n    filter: blur(0);\n  }\n}\n\n\/* \u5404\u6587\u5b57\u306b\u500b\u5225\u9045\u5ef6 *\/\n.blur-in-chars span {\n  display: inline-block;\n  opacity: 0;\n  filter: blur(8px);\n  animation: blurIn 0.6s ease forwards;\n}\n\n.blur-in-chars span:nth-child(1) { animation-delay: 0.1s; }\n.blur-in-chars span:nth-child(2) { animation-delay: 0.2s; }\n.blur-in-chars span:nth-child(3) { animation-delay: 0.3s; }\n.blur-in-chars span:nth-child(4) { animation-delay: 0.4s; }\n.blur-in-chars span:nth-child(5) { animation-delay: 0.5s; }\n<\/code><\/pre>\n<\/div>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u30c6\u30ad\u30b9\u30c8\u306e\u30a2\u30f3\u30c0\u30fc\u30e9\u30a4\u30f3\uff08\u4e0b\u7dda\uff09\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3<\/h2>\n<p class=\"wp-block-paragraph\">\u30ea\u30f3\u30af\u3084\u30ad\u30e3\u30c3\u30c1\u30b3\u30d4\u30fc\u306b\u30db\u30d0\u30fc\u6642\u306e\u30a2\u30f3\u30c0\u30fc\u30e9\u30a4\u30f3\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u4ed8\u3051\u308b\u306e\u3082\u4eba\u6c17\u306e\u5b9f\u88c5\u3067\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5de6\u304b\u3089\u53f3\u3078\u4f38\u3073\u308b\u30a2\u30f3\u30c0\u30fc\u30e9\u30a4\u30f3 *\/\n.underline-slide {\n  position: relative;\n  display: inline-block;\n  text-decoration: none;\n  color: inherit;\n}\n\n.underline-slide::after {\n  content: '';\n  position: absolute;\n  bottom: -2px;\n  left: 0;\n  width: 0;\n  height: 2px;\n  background: currentColor;\n  transition: width 0.3s ease;\n}\n\n.underline-slide:hover::after {\n  width: 100%;\n}\n\n\/* \u4e2d\u592e\u304b\u3089\u4e21\u7aef\u3078\u5e83\u304c\u308b\u30a2\u30f3\u30c0\u30fc\u30e9\u30a4\u30f3 *\/\n.underline-center {\n  position: relative;\n  display: inline-block;\n}\n\n.underline-center::after {\n  content: '';\n  position: absolute;\n  bottom: -2px;\n  left: 50%;\n  width: 0;\n  height: 2px;\n  background: #d16176;\n  transition: width 0.3s ease, left 0.3s ease;\n}\n\n.underline-center:hover::after {\n  width: 100%;\n  left: 0;\n}\n<\/code><\/pre>\n<\/div>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u6bd4\u8f03<\/h2>\n<figure class=\"wp-block-image size-large\" data-dia=\"19269-2\"><img decoding=\"async\" width=\"1568\" height=\"669\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-2.png\" alt=\"\u30c6\u30ad\u30b9\u30c8\u30a2\u30cb\u30e1\u306e\u4e3b\u306a\u30d1\u30bf\u30fc\u30f3\" class=\"wp-image-19371\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-2.png 1568w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-2-768x328.png 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-2-1536x655.png 1536w\" sizes=\"(max-width: 1568px) 100vw, 1568px\" \/><\/figure>\n<figure class=\"wp-block-table\">\n<table>\n<thead>\n<tr>\n<th>\u6f14\u51fa\u540d<\/th>\n<th>\u4f7f\u7528\u30d7\u30ed\u30d1\u30c6\u30a3<\/th>\n<th>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/th>\n<th>\u9069\u3057\u305f\u5834\u9762<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3<\/td>\n<td>opacity + transform<\/td>\n<td>\u9ad8\uff08GPU\uff09<\/td>\n<td>\u6c4e\u7528\u30fb\u30d5\u30a1\u30fc\u30b9\u30c8\u30d3\u30e5\u30fc<\/td>\n<\/tr>\n<tr>\n<td>1\u6587\u5b57\u305a\u3064\u51fa\u73fe<\/td>\n<td>animation-delay + span<\/td>\n<td>\u4e2d\uff08span\u6570\u306b\u3088\u308b\uff09<\/td>\n<td>\u30bf\u30a4\u30c8\u30eb\u30fb\u30ed\u30b4<\/td>\n<\/tr>\n<tr>\n<td>\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u6587\u5b57<\/td>\n<td>background-clip: text<\/td>\n<td>\u4e2d<\/td>\n<td>\u30d2\u30fc\u30ed\u30fc\u30bb\u30af\u30b7\u30e7\u30f3<\/td>\n<\/tr>\n<tr>\n<td>\u30cd\u30aa\u30f3\u767a\u5149<\/td>\n<td>text-shadow \u30a2\u30cb\u30e1<\/td>\n<td>\u4f4e\uff08\u591a\u91cdshadow\uff09<\/td>\n<td>\u30c0\u30fc\u30af\u30c6\u30fc\u30de\u9650\u5b9a<\/td>\n<\/tr>\n<tr>\n<td>\u30d6\u30e9\u30fc\u30a4\u30f3<\/td>\n<td>filter: blur<\/td>\n<td>\u4e2d\u301c\u4f4e<\/td>\n<td>\u6f14\u51fa\u91cd\u8996\u306eLP<\/td>\n<\/tr>\n<tr>\n<td>\u30a2\u30f3\u30c0\u30fc\u30e9\u30a4\u30f3\u30b9\u30e9\u30a4\u30c9<\/td>\n<td>::after + width transition<\/td>\n<td>\u9ad8<\/td>\n<td>\u30ca\u30d3\u30fb\u30ea\u30f3\u30af<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">prefers-reduced-motion \u3067\u30a2\u30af\u30bb\u30b7\u30d3\u30ea\u30c6\u30a3\u5bfe\u5fdc<\/h2>\n<p class=\"wp-block-paragraph\">\u524d\u5ead\u969c\u5bb3\u3084\u4e57\u308a\u7269\u9154\u3044\u304c\u3057\u3084\u3059\u3044\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u3001\u6fc0\u3057\u3044\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306f\u4f53\u8abf\u306b\u5f71\u97ff\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002OS\u306e\u300c\u8996\u5dee\u52b9\u679c\u3092\u6e1b\u3089\u3059\u300d\u8a2d\u5b9a\u3092\u5c0a\u91cd\u3059\u308b\u305f\u3081\u306b\u3001<strong><span class=\"swl-marker mark_yellow\">prefers-reduced-motion \u30e1\u30c7\u30a3\u30a2\u30af\u30a8\u30ea<\/span><\/strong>\u3092\u5fc5\u305a\u5b9f\u88c5\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5168\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u4e00\u62ec\u3067\u30ea\u30bb\u30c3\u30c8 *\/\n@media (prefers-reduced-motion: reduce) {\n  *,\n  *::before,\n  *::after {\n    animation-duration: 0.01ms !important;\n    animation-iteration-count: 1 !important;\n    transition-duration: 0.01ms !important;\n  }\n}\n\n\/* \u500b\u5225\u306b\u5236\u5fa1\u3059\u308b\u5834\u5408 *\/\n.fade-in-up {\n  opacity: 0;\n  transform: translateY(30px);\n  animation: fadeInUp 0.6s ease forwards;\n}\n\n@media (prefers-reduced-motion: reduce) {\n  .fade-in-up {\n    animation: none;\n    opacity: 1;\n    transform: none;\n  }\n}\n<\/code><\/pre>\n<\/div>\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/withcode.tech\/media\/css-keyframes-animation\/\">CSS @keyframes\u306e\u4f7f\u3044\u65b9<\/a>\u3092\u7406\u89e3\u3057\u305f\u4e0a\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u7d44\u3080\u3068\u3001\u3053\u306e\u5236\u5fa1\u3082\u3088\u308a\u67d4\u8edf\u306b\u884c\u3048\u307e\u3059\u3002\u4e00\u62ec\u30ea\u30bb\u30c3\u30c8\u306f\u624b\u8efd\u3067\u3059\u304c\u3001\u4e00\u90e8\u306e\u6f14\u51fa\uff08\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u30b9\u30d4\u30ca\u30fc\u306a\u3069\uff09\u307e\u3067\u6b62\u307e\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3001\u91cd\u8981\u306a\u8981\u7d20\u306b\u306f\u500b\u5225\u5bfe\u5fdc\u3092\u63a8\u5968\u3057\u307e\u3059\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u30b9\u30af\u30ed\u30fc\u30eb\u9023\u52d5\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\uff08Intersection Observer\uff09<\/h2>\n<figure class=\"wp-block-image size-large\" data-dia=\"19269-3\"><img decoding=\"async\" width=\"1568\" height=\"731\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-3.png\" alt=\"\u30b9\u30af\u30ed\u30fc\u30eb\u767a\u706b\u306e4\u30b9\u30c6\u30c3\u30d7\" class=\"wp-image-19372\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-3.png 1568w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-3-768x358.png 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-3-1536x716.png 1536w\" sizes=\"(max-width: 1568px) 100vw, 1568px\" \/><\/figure>\n<p class=\"wp-block-paragraph\">\u30da\u30fc\u30b8\u30ed\u30fc\u30c9\u6642\u3060\u3051\u3067\u306a\u304f\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u3066\u8981\u7d20\u304c\u753b\u9762\u306b\u5165\u3063\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u767a\u706b\u3055\u305b\u305f\u3044\u5834\u5408\u306f\u3001Intersection Observer API\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u521d\u671f\u72b6\u614b\uff1a\u975e\u8868\u793a *\/\n.scroll-reveal {\n  opacity: 0;\n  transform: translateY(40px);\n  transition: opacity 0.6s ease, transform 0.6s ease;\n}\n\n\/* JS\u3067\u30af\u30e9\u30b9\u304c\u4ed8\u3044\u305f\u3089\u8868\u793a *\/\n.scroll-reveal.is-visible {\n  opacity: 1;\n  transform: translateY(0);\n}\n<\/code><\/pre>\n<\/div>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-javascript\" data-lang=\"JavaScript\"><code>\/\/ Intersection Observer\u3067\u30b9\u30af\u30ed\u30fc\u30eb\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\nconst observer = new IntersectionObserver(\n  (entries) => {\n    entries.forEach(entry => {\n      if (entry.isIntersecting) {\n        entry.target.classList.add('is-visible');\n        \/\/ \u4e00\u5ea6\u8868\u793a\u3057\u305f\u3089\u76e3\u8996\u3092\u5916\u3059\uff08\u518d\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u4e0d\u8981\u306e\u5834\u5408\uff09\n        observer.unobserve(entry.target);\n      }\n    });\n  },\n  {\n    threshold: 0.1,      \/\/ 10%\u898b\u3048\u305f\u3089\u767a\u706b\n    rootMargin: '0px 0px -50px 0px' \/\/ \u5c11\u3057\u65e9\u3081\u306b\u767a\u706b\n  }\n);\n\ndocument.querySelectorAll('.scroll-reveal').forEach(el => {\n  observer.observe(el);\n});\n<\/code><\/pre>\n<\/div>\n<p class=\"wp-block-paragraph\">transition \u3092\u4f7f\u3063\u3066\u3044\u308b\u305f\u3081\u3001@keyframes \u3092\u5225\u9014\u66f8\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u305b\u3093\u3002CSS\u3060\u3051\u3067\u72b6\u614b\u3092\u5b9a\u7fa9\u3057\u3001JavaScript\u306f\u30af\u30e9\u30b9\u3092\u4ed8\u3051\u5916\u3057\u3059\u308b\u3060\u3051\u3068\u3044\u3046\u5f79\u5272\u5206\u62c5\u304c\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u5931\u6557\u3068\u5bfe\u51e6\u6cd5<\/h2>\n<figure class=\"wp-block-image size-large\" data-dia=\"19269-4\"><img decoding=\"async\" width=\"1568\" height=\"669\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-4.png\" alt=\"\u3064\u307e\u305a\u304d\u2192\u5bfe\u51e6\" class=\"wp-image-19373\" srcset=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-4.png 1568w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-4-768x328.png 768w, https:\/\/withcode.tech\/media\/wp-content\/uploads\/2026\/07\/dia-19269-4-1536x655.png 1536w\" sizes=\"(max-width: 1568px) 100vw, 1568px\" \/><\/figure>\n<h3 class=\"wp-block-heading\">\u5931\u65571\uff1a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u7d42\u4e86\u5f8c\u306b\u8981\u7d20\u304c\u6d88\u3048\u308b<\/h3>\n<p class=\"wp-block-paragraph\">animation-fill-mode: forwards\uff08\u307e\u305f\u306f animation \u306e\u30b7\u30e7\u30fc\u30c8\u30cf\u30f3\u30c9\u3067 forwards\uff09\u3092\u5fd8\u308c\u308b\u3068\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u7d42\u4e86\u5f8c\u306b\u521d\u671f\u72b6\u614b\uff08opacity: 0\uff09\u306b\u623b\u308a\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* NG\uff1aforwards\u306a\u3057 *\/\n.bad-example {\n  animation: fadeInUp 0.6s ease;\n}\n\n\/* OK\uff1aforwards\u3042\u308a *\/\n.good-example {\n  animation: fadeInUp 0.6s ease forwards;\n}\n<\/code><\/pre>\n<\/div>\n<h3 class=\"wp-block-heading\">\u5931\u65572\uff1adisplay: inline \u306e\u8981\u7d20\u306b transform \u304c\u52b9\u304b\u306a\u3044<\/h3>\n<p class=\"wp-block-paragraph\">span \u306a\u3069\u306e\u30a4\u30f3\u30e9\u30a4\u30f3\u8981\u7d20\u306b transform \u3092\u4f7f\u3044\u305f\u3044\u5834\u5408\u306f\u3001display: inline-block \u307e\u305f\u306f display: block \u306b\u5909\u66f4\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* NG\uff1ainline\u8981\u7d20\u306btransform\u306f\u52b9\u304b\u306a\u3044 *\/\nspan.bad {\n  transform: translateY(20px); \/* \u7121\u8996\u3055\u308c\u308b *\/\n}\n\n\/* OK\uff1ainline-block\u306b\u5909\u66f4 *\/\nspan.good {\n  display: inline-block;\n  transform: translateY(20px); \/* \u6709\u52b9 *\/\n}\n<\/code><\/pre>\n<\/div>\n<h3 class=\"wp-block-heading\">\u5931\u65573\uff1abackground-clip: text \u304c\u52b9\u304b\u306a\u3044<\/h3>\n<p class=\"wp-block-paragraph\">-webkit-text-fill-color: transparent \u3092\u5fd8\u308c\u308b\u3068\u3001background-clip\u3092\u8a2d\u5b9a\u3057\u3066\u3082\u30c6\u30ad\u30b9\u30c8\u306e\u8272\u304c\u305d\u306e\u307e\u307e\u8868\u793a\u3055\u308c\u3066\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u304c\u898b\u3048\u307e\u305b\u3093\u3002\u307e\u305f\u3001color: transparent \u306f -webkit-text-fill-color \u306e\u4ee3\u66ff\u306b\u306f\u306a\u3089\u306a\u3044\u74b0\u5883\u3082\u3042\u308b\u306e\u3067\u3001\u4e21\u65b9\u66f8\u304f\u306e\u304c\u5b89\u5168\u3067\u3059\u3002<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-css\" data-lang=\"CSS\"><code>\/* \u5fc5\u305a\u30bb\u30c3\u30c8\u3067\u66f8\u304f *\/\n.gradient-text {\n  background: linear-gradient(90deg, #ff6b6b, #a855f7);\n  -webkit-background-clip: text;\n  background-clip: text;\n  -webkit-text-fill-color: transparent;\n  color: transparent; \/* \u30d5\u30a9\u30fc\u30eb\u30d0\u30c3\u30af *\/\n}\n<\/code><\/pre>\n<\/div>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<p><!-- roam:retrofit18209-matome --><\/p>\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n<p class=\"wp-block-paragraph\">\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001CSS\u3060\u3051\u3067\u4f5c\u308c\u308b\u6587\u5b57\u306e\u30d5\u30a7\u30fc\u30c9\u30a4\u30f3\u30fb\u30b9\u30e9\u30a4\u30c9\u30a4\u30f3\u30fb1\u6587\u5b57\u305a\u3064\u306e\u8868\u793a\u306a\u3069\u3001\u30c6\u30ad\u30b9\u30c8\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u5b9a\u756a\u30d1\u30bf\u30fc\u30f3\u3092\u7d39\u4ecb\u3057\u307e\u3057\u305f\u3002\u30dd\u30a4\u30f3\u30c8\u306f\u2460opacity\u3068transform\u3092transition\u3084@keyframes\u3067\u52d5\u304b\u3059\u2461animation-delay\u3067\u8868\u793a\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u305a\u3089\u3059\u2462\u30b9\u30af\u30ed\u30fc\u30eb\u9023\u52d5\u306fIntersection Observer\u3092\u4f7f\u3046\u3001\u306e3\u3064\u3067\u3059\u3002\u30b3\u30d4\u30da\u3057\u305f\u3089duration\u3068delay\u3092\u5fae\u8abf\u6574\u3057\u3066\u3001\u3042\u306a\u305f\u306e\u30b5\u30a4\u30c8\u306e\u30c8\u30fc\u30f3\u306b\u5408\u308f\u305b\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p><!-- withmedia-faq --><\/p>\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09<\/h2>\n<h3 class=\"wp-block-heading\">CSS\u30c6\u30ad\u30b9\u30c8\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306fSEO\u306b\u60aa\u5f71\u97ff\u304c\u3042\u308a\u307e\u3059\u304b\uff1f<\/h3>\n<p class=\"wp-block-paragraph\">CSS\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u81ea\u4f53\u306fSEO\u306b\u60aa\u5f71\u97ff\u3092\u4e0e\u3048\u307e\u305b\u3093\u3002\u305f\u3060\u3057\u3001\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u958b\u59cb\u524d\u306bopacity: 0\u306b\u3057\u3066\u3044\u308b\u30c6\u30ad\u30b9\u30c8\u306f\u30af\u30ed\u30fc\u30e9\u30fc\u306b\u8aad\u307e\u308c\u307e\u3059\u304c\u3001\u610f\u56f3\u7684\u306a\u96a0\u853d\u3068\u306f\u898b\u306a\u3055\u308c\u306a\u3044\u305f\u3081\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u308b\u30da\u30fc\u30b8\u306e\u63cf\u753b\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b\u304cCore Web Vitals\u306b\u5f71\u97ff\u3059\u308b\u53ef\u80fd\u6027\u306f\u3042\u308b\u306e\u3067\u3001\u904e\u5ea6\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306f\u907f\u3051\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3 class=\"wp-block-heading\">animation \u3068 transition \u306e\u4f7f\u3044\u5206\u3051\u306f\u3069\u3046\u3059\u308c\u3070\u3044\u3044\u3067\u3059\u304b\uff1f<\/h3>\n<p class=\"wp-block-paragraph\">transition 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