{"id":10083,"date":"2026-09-07T09:57:58","date_gmt":"2026-09-07T00:57:58","guid":{"rendered":"https:\/\/fastcoding.jp\/blog\/?p=10083"},"modified":"2026-09-07T09:58:03","modified_gmt":"2026-09-07T00:58:03","slug":"image-skeleton-loading","status":"publish","type":"post","link":"https:\/\/fastcoding.jp\/blog\/all\/ui-ux\/image-skeleton-loading\/","title":{"rendered":"\u753b\u50cf\u304c\u8aad\u307f\u8fbc\u307e\u308c\u308b\u307e\u3067\u300c\u7070\u8272\u306e\u7bb1\u300d\u3092\u898b\u305b\u308b \u2500 \u30b9\u30b1\u30eb\u30c8\u30f3\u8868\u793a\u3067\u4f53\u611f\u901f\u5ea6\u3092\u6539\u5584\u3059\u308b"},"content":{"rendered":"<div class=\"the_content\">\n<p class=\"wp-block-paragraph\">\u3053\u3093\u306b\u3061\u306f\u3001\u682a\u5f0f\u4f1a\u793e\u30d5\u30a1\u30b9\u30c8\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306eBigVi\u3067\u3059\u3002\u5148\u9031\u3001\u592b\u3068\u4e00\u7dd2\u306b\u30cd\u30c3\u30c8\u3067\u5bb6\u5177\u3092\u898b\u3066\u3044\u307e\u3057\u305f\u3002\u5199\u771f\u304c\u305f\u304f\u3055\u3093\u3042\u308b\u30da\u30fc\u30b8\u3067\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u3059\u308b\u3068\u753b\u50cf\u304c\u7a81\u7136\u30d1\u30c3\u3068\u51fa\u3066\u304d\u3066\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u30ac\u30bf\u30c3\u3068\u305a\u308c\u307e\u3057\u305f\u3002\u3002\u592b\u304c\u300c\u58ca\u308c\u305f\uff1f\u300d\u3063\u3066\u805e\u3044\u3066\u304d\u307e\u3057\u305f\u3002\u58ca\u308c\u3066\u306a\u3044\u3051\u3069\u3001\u78ba\u304b\u306b\u6c17\u6301\u3061\u3044\u3044\u4f53\u9a13\u3067\u306f\u306a\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u65e5\u3001\u304a\u5ba2\u3055\u307e\u304b\u3089\u300cEC\u30b5\u30a4\u30c8\u306e\u5546\u54c1\u4e00\u89a7\u30da\u30fc\u30b8\u304c\u30ab\u30af\u30ab\u30af\u3059\u308b\u300d\u3068\u76f8\u8ac7\u304c\u3042\u308a\u307e\u3057\u305f\u3002<code>loading=\"lazy\"<\/code>\u3067\u753b\u50cf\u3092\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3057\u3066\u3044\u308b\u3051\u3069\u3001\u753b\u50cf\u304c\u8868\u793a\u3055\u308c\u308b\u307e\u3067\u771f\u3063\u767d\u3067\u3001\u7a81\u7136\u8868\u793a\u3055\u308c\u308b\u3068\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u305a\u308c\u308b\u3002CLS\uff08Cumulative Layout Shift\uff09\u3082\u60aa\u3044\u6570\u5024\u3067\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u79c1\u3082\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u753b\u50cf\u304c\u591a\u3044\u30b5\u30a4\u30c8\u3067\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u305f\u3089\u6025\u306b\u30ac\u30bf\u30c3\u3068\u305a\u308c\u3066\u3001\u8aad\u3093\u3067\u3044\u305f\u5834\u6240\u304c\u308f\u304b\u3089\u306a\u304f\u306a\u308b\u3053\u3068\u3002\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4eca\u56de\u306f\u300c\u753b\u50cf\u304c\u8aad\u307f\u8fbc\u307e\u308c\u308b\u307e\u3067\u3001\u7070\u8272\u306e\u77e9\u5f62\uff0b\u30b7\u30de\u30fc\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\uff08\u30b9\u30b1\u30eb\u30c8\u30f3\u8868\u793a\uff09\u3092\u8868\u793a\u3059\u308b\u300d\u3068\u3044\u3046\u5b9f\u88c5\u3092\u3057\u307e\u3057\u305f\u3002\u30e6\u30fc\u30b6\u30fc\u306b\u300c\u3053\u3053\u306b\u753b\u50cf\u304c\u6765\u307e\u3059\u3088\u300d\u3068\u4f1d\u3048\u3066\u3001\u30ac\u30bf\u3064\u304d\u3092\u306a\u304f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u306a\u305c\u30b9\u30b1\u30eb\u30c8\u30f3\u8868\u793a\u304c\u5fc5\u8981\u306a\u306e\u304b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>loading=\"lazy\"<\/code>\u306f\u826f\u3044\u6280\u8853\u3067\u3059\u3002\u30da\u30fc\u30b8\u306e\u521d\u671f\u8868\u793a\u304c\u901f\u304f\u306a\u308a\u307e\u3059\u3002\u3067\u3082\u554f\u984c\u3082\u3042\u308a\u307e\u3059\u3002\u753b\u50cf\u304c\u8aad\u307f\u8fbc\u307e\u308c\u308b\u524d\u306f\u3001<code>img<\/code>\u8981\u7d20\u306e\u30b5\u30a4\u30ba\u304c0\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u8aad\u307f\u8fbc\u307e\u308c\u305f\u77ac\u9593\u306b\u30b5\u30a4\u30ba\u304c\u78ba\u5b9a\u3057\u3066\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u305a\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>width<\/code>\u3068<code>height<\/code>\u5c5e\u6027\u3092\u3064\u3051\u308c\u3070CLS\u306f\u6539\u5584\u3067\u304d\u307e\u3059\u3002\u3067\u3082\u8aad\u307f\u8fbc\u307f\u4e2d\u306f\u771f\u3063\u767d\u306e\u7a7a\u9593\u3067\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u304b\u3089\u3059\u308b\u3068\u300c\u3053\u3053\u306f\u4f55\u3082\u306a\u3044\u306e\u304b\u306a\uff1f\u300d\u3068\u601d\u3063\u3066\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b9\u30b1\u30eb\u30c8\u30f3\u8868\u793a\u306f2\u3064\u306e\u554f\u984c\u3092\u89e3\u6c7a\u3057\u307e\u3059\u30021\u3064\u76ee\u306f\u300c\u3053\u3053\u306b\u753b\u50cf\u304c\u6765\u308b\u300d\u3068\u3044\u3046\u8996\u899a\u7684\u306a\u30d2\u30f3\u30c8\u3067\u3059\u30022\u3064\u76ee\u306f\u30b7\u30de\u30fc\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3067\u300c\u8aad\u307f\u8fbc\u307f\u4e2d\u300d\u3068\u4f1d\u3048\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3042\u308b\u6848\u4ef6\u3067\u3001\u6700\u521d\u306f\u30b9\u30d4\u30ca\u30fc\uff08\u304f\u308b\u304f\u308b\u56de\u308b\u30a2\u30a4\u30b3\u30f3\uff09\u3092\u8868\u793a\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u3067\u3082\u30b9\u30d4\u30ca\u30fc\u306f\u300c\u5f85\u3063\u3066\u300d\u3068\u3044\u3046\u5370\u8c61\u304c\u5f37\u304f\u3066\u3001\u304a\u5ba2\u3055\u307e\u306b\u300c\u9045\u3044\u30b5\u30a4\u30c8\u306b\u898b\u3048\u308b\u300d\u3068\u8a00\u308f\u308c\u307e\u3057\u305f\u3002\u3002\u30b9\u30b1\u30eb\u30c8\u30f3\u306b\u5909\u3048\u305f\u3089\u300c\u901f\u304f\u611f\u3058\u308b\u300d\u3068\u8a00\u3063\u3066\u304f\u308c\u307e\u3057\u305f\u3002\u5b9f\u969b\u306e\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u306f\u540c\u3058\u306a\u306e\u306b\u3001\u898b\u305b\u65b9\u3067\u5370\u8c61\u304c\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b9f\u88c5\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">HTML\u69cb\u9020<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>img<\/code>\u8981\u7d20\u3092\u30e9\u30c3\u30d1\u30fc\u3067\u56f2\u307f\u307e\u3059\u3002\u30b9\u30b1\u30eb\u30c8\u30f3\u306fCSS\u306e\u7591\u4f3c\u8981\u7d20\u3067\u4f5c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;div class=\"img-skeleton\" data-skeleton&gt;\n  &lt;img\n    src=\"product.jpg\"\n    alt=\"\u5546\u54c1\u540d\"\n    width=\"400\"\n    height=\"300\"\n    loading=\"lazy\"\n  &gt;\n&lt;\/div&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>width<\/code>\u3068<code>height<\/code>\u3092\u3064\u3051\u308b\u306e\u304c\u5927\u4e8b\u3067\u3059\u3002\u30d6\u30e9\u30a6\u30b6\u304c\u4e8b\u524d\u306b\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u3092\u8a08\u7b97\u3057\u3066\u3001\u8868\u793a\u9818\u57df\u3092\u78ba\u4fdd\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u3053\u308c\u3060\u3051\u3067CLS\u304c\u5927\u5e45\u306b\u6539\u5584\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">CSS\u30b9\u30bf\u30a4\u30eb<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b9\u30b1\u30eb\u30c8\u30f3\u306e\u7070\u8272\u77e9\u5f62\u3068\u30b7\u30de\u30fc\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092CSS\u3067\u4f5c\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>.img-skeleton {\n  position: relative;\n  overflow: hidden;\n  background: #e0e0e0;\n  line-height: 0;\n}\n\n.img-skeleton img {\n  display: block;\n  width: 100%;\n  height: auto;\n  aspect-ratio: attr(width) \/ attr(height);\n  opacity: 0;\n  transition: opacity 0.3s ease;\n}\n\n.img-skeleton[data-loaded] img {\n  opacity: 1;\n}\n\n.img-skeleton::after {\n  content: '';\n  position: absolute;\n  top: 0;\n  left: 0;\n  width: 100%;\n  height: 100%;\n  background: linear-gradient(\n    90deg,\n    transparent 0%,\n    rgba(255, 255, 255, 0.4) 50%,\n    transparent 100%\n  );\n  animation: shimmer 1.5s infinite;\n}\n\n.img-skeleton[data-loaded]::after {\n  display: none;\n}\n\n@keyframes shimmer {\n  0% { transform: translateX(-100%); }\n  100% { transform: translateX(100%); }\n}\n\n@media (prefers-reduced-motion: reduce) {\n  .img-skeleton::after {\n    animation: none;\n    background: rgba(255, 255, 255, 0.2);\n  }\n\n  .img-skeleton img {\n    transition: none;\n  }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30dd\u30a4\u30f3\u30c8\u306f<code>opacity<\/code>\u3092\u4f7f\u3063\u3066\u753b\u50cf\u306e\u8868\u793a\u3092\u5207\u308a\u66ff\u3048\u308b\u3053\u3068\u3067\u3059\u3002<code>display: none<\/code>\u3060\u3068\u30d6\u30e9\u30a6\u30b6\u304c\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u307e\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<code>opacity: 0<\/code>\u306a\u3089\u898b\u3048\u306a\u3044\u3051\u3069\u8aad\u307f\u8fbc\u307f\u306f\u59cb\u307e\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>line-height: 0<\/code>\u306f\u3088\u304f\u5fd8\u308c\u307e\u3059\u3002\u3053\u308c\u304c\u306a\u3044\u3068\u3001<code>img<\/code>\u306e\u4e0b\u306b\u6570\u30d4\u30af\u30bb\u30eb\u306e\u9699\u9593\u304c\u3067\u304d\u3066\u30b9\u30b1\u30eb\u30c8\u30f3\u306e\u7070\u8272\u304c\u306f\u307f\u51fa\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b7\u30de\u30fc\u306e\u8272\u306f<code>rgba(255, 255, 255, 0.4)<\/code>\u3067\u3059\u3002\u767d\u306e\u534a\u900f\u660e\u304c\u7070\u8272\u306e\u4e0a\u3092\u6d41\u308c\u308b\u3068\u3001\u91d1\u5c5e\u3063\u307d\u3044\u5149\u6ca2\u306b\u306a\u308a\u307e\u3059\u3002\u65b9\u5411\u306f\u5de6\u304b\u3089\u53f3\u3067\u3059\u3002\u30a2\u30e9\u30d3\u30a2\u8a9e\u306eRTL\u30b5\u30a4\u30c8\u3067\u306f\u9006\u306b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">JavaScript\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u753b\u50cf\u306e<code>load<\/code>\u30a4\u30d9\u30f3\u30c8\u3092\u76e3\u8996\u3057\u3066\u3001\u8aad\u307f\u8fbc\u307f\u5b8c\u4e86\u3057\u305f\u3089<code>data-loaded<\/code>\u5c5e\u6027\u3092\u3064\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>document.addEventListener('DOMContentLoaded', () =&gt; {\n  const skeletons = document.querySelectorAll('[data-skeleton]');\n\n  skeletons.forEach((wrapper) =&gt; {\n    const img = wrapper.querySelector('img');\n    if (!img) return;\n\n    function onLoaded() {\n      wrapper.setAttribute('data-loaded', '');\n      img.removeEventListener('load', onLoaded);\n    }\n\n    if (img.complete &amp;&amp; img.naturalWidth &gt; 0) {\n      onLoaded();\n    } else {\n      img.addEventListener('load', onLoaded);\n    }\n  });\n});<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>img.complete<\/code>\u306e\u30c1\u30a7\u30c3\u30af\u304c\u5927\u4e8b\u3067\u3059\u3002\u30d6\u30e9\u30a6\u30b6\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u753b\u50cf\u304c\u3042\u308b\u5834\u5408\u3001<code>DOMContentLoaded<\/code>\u306e\u6642\u70b9\u3067\u3059\u3067\u306b\u8aad\u307f\u8fbc\u307f\u5b8c\u4e86\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<code>load<\/code>\u30a4\u30d9\u30f3\u30c8\u306f\u767a\u706b\u3057\u306a\u3044\u306e\u3067\u3001<code>complete<\/code>\u3067\u5148\u306b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>naturalWidth &gt; 0<\/code>\u3082\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002<code>complete<\/code>\u304c<code>true<\/code>\u3067\u3082\u3001\u753b\u50cf\u306eURL\u304c\u9593\u9055\u3063\u3066\u3044\u3066\u8aad\u307f\u8fbc\u307f\u5931\u6557\u3057\u305f\u5834\u5408\u306f<code>naturalWidth<\/code>\u304c0\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">aspect-ratio\u3067CLS\u9632\u6b62<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>width<\/code>\u3068<code>height<\/code>\u5c5e\u6027\u3060\u3051\u3060\u3068\u3001CSS\u3067\u30b5\u30a4\u30ba\u3092\u5909\u3048\u305f\u3068\u304d\u306b\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u304c\u304a\u304b\u3057\u304f\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<code>aspect-ratio<\/code>\u30d7\u30ed\u30d1\u30c6\u30a3\u3082\u4f75\u7528\u3059\u308b\u3068\u5b89\u5168\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>.img-skeleton img {\n  width: 100%;\n  height: auto;\n  aspect-ratio: attr(width) \/ attr(height);\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u305f\u3060\u3057\u3001<code>aspect-ratio: attr()<\/code>\u306f\u4e00\u90e8\u306e\u30d6\u30e9\u30a6\u30b6\u3067\u307e\u3060\u5bfe\u5fdc\u3057\u3066\u3044\u306a\u3044\u3067\u3059\u3002\u78ba\u5b9f\u306b\u52d5\u304b\u3059\u306b\u306f\u3001CSS\u30ab\u30b9\u30bf\u30e0\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4f7f\u3046\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;div class=\"img-skeleton\" data-skeleton style=\"--ratio: 400 \/ 300\"&gt;\n  &lt;img src=\"product.jpg\" alt=\"\u5546\u54c1\u540d\" width=\"400\" height=\"300\" loading=\"lazy\"&gt;\n&lt;\/div&gt;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>.img-skeleton {\n  aspect-ratio: var(--ratio, 4 \/ 3);\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u6ce8\u610f\u70b9<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5b9f\u88c5\u3059\u308b\u3068\u304d\u306b\u6c17\u3092\u3064\u3051\u305f\u3053\u3068\u304c3\u3064\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\u3064\u76ee\u306f\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3067\u3059\u3002\u753b\u50cf\u306e\u8aad\u307f\u8fbc\u307f\u304c\u5931\u6557\u3057\u305f\u5834\u5408\u3001\u30b9\u30b1\u30eb\u30c8\u30f3\u304c\u305a\u3063\u3068\u8868\u793a\u3055\u308c\u305f\u307e\u307e\u306b\u306a\u308a\u307e\u3059\u3002<code>error<\/code>\u30a4\u30d9\u30f3\u30c8\u3082\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3057\u3066\u3001\u4ee3\u66ff\u753b\u50cf\u3092\u8868\u793a\u3059\u308b\u304b\u3001\u30b9\u30b1\u30eb\u30c8\u30f3\u3092\u975e\u8868\u793a\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>img.addEventListener('error', () =&gt; {\n  wrapper.setAttribute('data-loaded', '');\n  img.alt = '\u753b\u50cf\u3092\u8aad\u307f\u8fbc\u3081\u307e\u305b\u3093\u3067\u3057\u305f';\n});<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">2\u3064\u76ee\u306f\u753b\u50cf\u306e\u679a\u6570\u3067\u3059\u3002\u5546\u54c1\u4e00\u89a7\u30da\u30fc\u30b8\u3067100\u679a\u4ee5\u4e0a\u306e\u753b\u50cf\u304c\u3042\u308b\u5834\u5408\u3001\u5404\u753b\u50cf\u306b<code>load<\/code>\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3092\u3064\u3051\u308b\u3068\u5c11\u3057\u91cd\u304f\u306a\u308a\u307e\u3059\u3002\u3067\u3082IntersectionObserver\u3068\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u753b\u9762\u306b\u898b\u3048\u308b\u753b\u50cf\u3060\u3051\u51e6\u7406\u3059\u308b\u65b9\u6cd5\u306f\u8907\u96d1\u306b\u306a\u308a\u3059\u304e\u307e\u3059\u3002100\u679a\u7a0b\u5ea6\u306a\u3089\u6c17\u306b\u3057\u306a\u304f\u3066\u5927\u4e08\u592b\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3\u3064\u76ee\u306f<code>prefers-reduced-motion<\/code>\u3067\u3059\u3002\u30b7\u30de\u30fc\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u7121\u52b9\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u4ee3\u308f\u308a\u306b\u767d\u306e\u534a\u900f\u660e\u3092\u9759\u7684\u306b\u91cd\u306d\u3066\u3001\u300c\u3053\u3053\u306f\u307e\u3060\u8aad\u307f\u8fbc\u307f\u4e2d\u300d\u3068\u308f\u304b\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5b9f\u969b\u306e\u7d50\u679c<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u304a\u5ba2\u3055\u307e\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3001A\/B\u30c6\u30b9\u30c8\u30923\u9031\u9593\u3084\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>\u6307\u6a19<\/th><th>\u30b9\u30b1\u30eb\u30c8\u30f3\u306a\u3057\uff08A\uff09<\/th><th>\u30b9\u30b1\u30eb\u30c8\u30f3\u3042\u308a\uff08B\uff09<\/th><th>\u5dee\u5206<\/th><\/tr><\/thead><tbody><tr><td>\u4f53\u611f\u901f\u5ea6\u306e\u8a55\u4fa1\uff085\u70b9\u6e80\u70b9\uff09<\/td><td>3.1<\/td><td>4.2<\/td><td>+1.1<\/td><\/tr><tr><td>\u30da\u30fc\u30b8\u6ede\u5728\u6642\u9593<\/td><td>45\u79d2<\/td><td>58\u79d2<\/td><td>+13\u79d2<\/td><\/tr><tr><td>CLS\uff08Core Web Vitals\uff09<\/td><td>0.18<\/td><td>0.04<\/td><td>-0.14<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f53\u611f\u901f\u5ea6\u306e\u8a55\u4fa1\u306f\u30e6\u30fc\u30b6\u30fc\u30a2\u30f3\u30b1\u30fc\u30c8\u306e\u7d50\u679c\u3067\u3059\u3002\u5b9f\u969b\u306e\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u306f\u307b\u307c\u540c\u3058\u306a\u306e\u306b\u3001\u30b9\u30b1\u30eb\u30c8\u30f3\u304c\u3042\u308b\u3060\u3051\u3067\u300c\u901f\u3044\u300d\u3068\u611f\u3058\u3066\u3082\u3089\u3048\u307e\u3057\u305f\u3002CLS\u30820.18\u304b\u30890.04\u306b\u6539\u5584\u3057\u3066\u3044\u307e\u3059\u3002Google\u304c\u63a8\u5968\u3059\u308b\u300c\u826f\u597d\u300d\u306e\u57fa\u6e96\u306f0.1\u4ee5\u4e0b\u306a\u306e\u3067\u3001\u4f59\u88d5\u3067\u30af\u30ea\u30a2\u3057\u307e\u3057\u305f\u3002\u30da\u30fc\u30b8\u6ede\u5728\u6642\u9593\u308213\u79d2\u5897\u3048\u3066\u3044\u307e\u3059\u3002\u30ac\u30bf\u3064\u304d\u304c\u306a\u304f\u306a\u3063\u305f\u3053\u3068\u3067\u3001\u30b9\u30c8\u30ec\u30b9\u306a\u304f\u30b9\u30af\u30ed\u30fc\u30eb\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u304b\u3089\u3060\u3068\u601d\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u3053\u308c\u306f1\u3064\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306e\u7d50\u679c\u3067\u3059\u3002\u52b9\u679c\u306f\u753b\u50cf\u306e\u679a\u6570\u3084\u30da\u30fc\u30b8\u69cb\u6210\u306b\u3088\u3063\u3066\u5909\u308f\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>loading=\"lazy\"<\/code>\u3060\u3051\u3060\u3068\u3001\u753b\u50cf\u306e\u5834\u6240\u304c\u7a7a\u767d\u306b\u306a\u3063\u3066\u7a81\u7136\u8868\u793a\u3055\u308c\u307e\u3059\u3002\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u305a\u308c\u308b\u3057\u3001\u4f53\u611f\u7684\u306b\u3082\u9045\u304f\u611f\u3058\u307e\u3059\u3002\u30b9\u30b1\u30eb\u30c8\u30f3\u8868\u793a\u3092\u5165\u308c\u308b\u3053\u3068\u3067\u3001\u300c\u3053\u3053\u306b\u753b\u50cf\u304c\u6765\u307e\u3059\u3088\u300d\u3068\u4f1d\u3048\u3089\u308c\u3066\u3001\u30ac\u30bf\u3064\u304d\u3082\u306a\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4eca\u56de\u306e\u30dd\u30a4\u30f3\u30c8\u306f\u4ee5\u4e0b\u306e3\u3064\u3067\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>width<\/code>\u3068<code>height<\/code>\u5c5e\u6027\u3092\u3064\u3051\u3066\u3001<code>aspect-ratio<\/code>\u3067\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u3092\u78ba\u4fdd\u3059\u308b\u3002\u3053\u308c\u3060\u3051\u3067CLS\u304c\u5927\u5e45\u306b\u6539\u5584\u3059\u308b<\/li>\n<li>\u30b7\u30de\u30fc\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306f<code>transform: translateX()<\/code>\u3067\u4f5c\u308b\u3002<code>left<\/code>\u306e\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3088\u308a\u8efd\u3044\uff08GPU\u3067\u51e6\u7406\u3055\u308c\u308b\uff09<\/li>\n<li><code>img.complete<\/code>\u3067\u4e8b\u524d\u30c1\u30a7\u30c3\u30af\u3057\u3066\u304b\u3089<code>load<\/code>\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3092\u3064\u3051\u308b\u3002\u30ad\u30e3\u30c3\u30b7\u30e5\u6e08\u307f\u753b\u50cf\u306e\u5bfe\u5fdc\u3092\u5fd8\u308c\u306a\u3044<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u304a\u5ba2\u3055\u307e\u304b\u3089\u306f\u300c\u8868\u793a\u304c\u901f\u304f\u306a\u3063\u305f\u6c17\u304c\u3059\u308b\u300d\u3068\u8a00\u3063\u3066\u304f\u308c\u307e\u3057\u305f\u3002\u3002\u5b9f\u969b\u306b\u306f\u901f\u304f\u306a\u3063\u3066\u3044\u306a\u3044\u3067\u3059\u3002\u898b\u305b\u65b9\u304c\u5909\u308f\u3063\u305f\u3060\u3051\u3067\u3059\u3002\u3067\u3082\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u306f\u300c\u611f\u3058\u308b\u901f\u3055\u300d\u304c\u5927\u4e8b\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u682a\u5f0f\u4f1a\u793e\u30d5\u30a1\u30b9\u30c8\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u3067\u306f\u3001\u3053\u3046\u3057\u305fCore Web Vitals\u306e\u6539\u5584\u3084\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u306e\u5b9f\u88c5\u30b5\u30dd\u30fc\u30c8\u3092\u3057\u3066\u3044\u307e\u3059\u3002\u300c\u753b\u50cf\u306e\u591a\u3044\u30da\u30fc\u30b8\u3092\u306a\u3093\u3068\u304b\u3057\u305f\u3044\u300d\u300cCLS\u306e\u30b9\u30b3\u30a2\u3092\u6539\u5584\u3057\u305f\u3044\u300d\u3068\u3044\u3046\u65b9\u306f\u3001<a href=\"https:\/\/fastcoding.jp\/contact\/\">\u304a\u554f\u3044\u5408\u308f\u305b\u30d5\u30a9\u30fc\u30e0<\/a>\u304b\u3089\u6c17\u8efd\u306b\u3054\u9023\u7d61\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u203b\u672c\u8a18\u4e8b\u306f\u5f0a\u793e\u5916\u56fd\u4eba\u30b9\u30bf\u30c3\u30d5\u306b\u3088\u308b\u6295\u7a3f\u3067\u3059\u3002\u8a00\u3044\u56de\u3057\u3084\u8868\u73fe\u304c\u4e0d\u5341\u5206\u306a\u500b\u6240\u304c\u3042\u308a\u307e\u3059\u3053\u3068\u3054\u5bb9\u8d66\u3044\u305f\u3060\u304d\u307e\u3059\u3088\u3046\u304a\u9858\u3044\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\u3001\u682a\u5f0f\u4f1a\u793e\u30d5\u30a1\u30b9\u30c8\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u306eBigVi\u3067\u3059\u3002\u5148\u9031\u3001\u592b\u3068\u4e00\u7dd2\u306b\u30cd\u30c3\u30c8\u3067\u5bb6\u5177\u3092\u898b\u3066\u3044\u307e\u3057\u305f\u3002\u5199\u771f\u304c\u305f\u304f\u3055\u3093\u3042\u308b\u30da\u30fc\u30b8\u3067\u3001\u30b9\u30af\u30ed\u30fc\u30eb\u3059\u308b\u3068\u753b\u50cf\u304c\u7a81\u7136\u30d1\u30c3\u3068\u51fa\u3066\u304d\u3066\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u30ac\u30bf\u30c3\u3068\u305a\u308c\u307e\u3057\u305f\u3002\u3002\u592b\u304c\u300c\u58ca\u308c\u305f\uff1f 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