{"id":10075,"date":"2026-08-05T10:13:08","date_gmt":"2026-08-05T01:13:08","guid":{"rendered":"https:\/\/fastcoding.jp\/blog\/?p=10075"},"modified":"2026-08-05T10:13:16","modified_gmt":"2026-08-05T01:13:16","slug":"stock-availability-animation","status":"publish","type":"post","link":"https:\/\/fastcoding.jp\/blog\/all\/ui-ux\/stock-availability-animation\/","title":{"rendered":"\u5728\u5eab\u30fb\u7a7a\u304d\u67a0\u306e\u6570\u5b57\u304c\u5909\u308f\u3063\u305f\u77ac\u9593\u3060\u3051\u5149\u3089\u305b\u308b \u2500 \u5b89\u5fc3\u611f\u3092\u4f5c\u308b\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u6f14\u51fa"},"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\u6700\u8fd1\u3001\u592b\u3068\u4e00\u7dd2\u306b\u30db\u30c6\u30eb\u306e\u4e88\u7d04\u30b5\u30a4\u30c8\u3092\u898b\u3066\u3044\u307e\u3057\u305f\u3002\u300c\u6b8b\u308a2\u90e8\u5c4b\u300d\u3063\u3066\u8868\u793a\u304c\u3042\u3063\u3066\u3001\u3061\u3087\u3063\u3068\u7126\u308a\u307e\u3057\u305f\u3002\u3002\u3067\u3082\u30da\u30fc\u30b8\u3092\u66f4\u65b0\u3057\u305f\u3089\u300c\u6b8b\u308a3\u90e8\u5c4b\u300d\u306b\u5897\u3048\u3066\u3044\u3066\u3001\u300c\u3042\u308c\uff1f\u30ad\u30e3\u30f3\u30bb\u30eb\u51fa\u305f\uff1f\u300d\u3063\u3066\u6df7\u4e71\u3057\u307e\u3057\u305f\u3002\u6570\u5b57\u304c\u5909\u308f\u3063\u305f\u306e\u306b\u3001\u4f55\u3082\u6f14\u51fa\u304c\u306a\u3044\u304b\u3089\u6c17\u3065\u304d\u306b\u304f\u304b\u3063\u305f\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u65e5\u3001\u304a\u5ba2\u3055\u307e\u304b\u3089\u300c\u4e88\u7d04\u30da\u30fc\u30b8\u306e\u7a7a\u304d\u67a0\u306e\u6570\u5b57\u3092\u8868\u793a\u3057\u3066\u3044\u308b\u3051\u3069\u3001\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u5909\u308f\u308b\u306e\u306b\u6c17\u3065\u3044\u3066\u3082\u3089\u3048\u306a\u3044\u300d\u3068\u76f8\u8ac7\u3055\u308c\u307e\u3057\u305f\u3002\u7a7a\u304d\u67a0\u304c\u6e1b\u3063\u305f\u3068\u304d\u306b\u7126\u3089\u305b\u305f\u304f\u306a\u3044\u3051\u3069\u3001\u5909\u308f\u3063\u305f\u3053\u3068\u306f\u4f1d\u3048\u305f\u3044\u3002\u96e3\u3057\u3044\u30d0\u30e9\u30f3\u30b9\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u79c1\u3082\u3088\u304f\u3042\u308a\u307e\u3059\u3002EC\u30b5\u30a4\u30c8\u3067\u300c\u6b8b\u308a5\u70b9\u300d\u3063\u3066\u898b\u3066\u3001\u3057\u3070\u3089\u304f\u3057\u3066\u898b\u305f\u3089\u6570\u5b57\u304c\u5909\u308f\u3063\u3066\u3044\u305f\u306e\u306b\u6c17\u3065\u304b\u306a\u3044\u3053\u3068\u3002\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4eca\u56de\u306f\u300c\u6570\u5b57\u304c\u5909\u308f\u3063\u305f\u77ac\u9593\u3060\u3051\u3001\u6570\u5024\u306b\u30d5\u30a7\u30fc\u30c9\uff0b\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u98a8\u306e\u6f14\u51fa\u3092\u3064\u3051\u308b\u300d\u3068\u3044\u3046\u5b9f\u88c5\u3092\u3057\u307e\u3057\u305f\u3002IntersectionObserver\u3068MutationObserver\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3001\u753b\u9762\u306b\u898b\u3048\u3066\u3044\u308b\u3068\u304d\u3060\u3051\u53cd\u5fdc\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u306a\u305c\u300c\u5909\u308f\u3063\u305f\u77ac\u9593\u300d\u3060\u3051\u306a\u306e\u304b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u5eab\u3084\u7a7a\u304d\u67a0\u306e\u6570\u5b57\u306f\u3001\u30da\u30fc\u30b8\u3092\u958b\u3044\u305f\u3068\u304d\u306b\u898b\u3048\u308b\u3060\u3051\u3067\u306f\u8db3\u308a\u306a\u3044\u3067\u3059\u3002\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u5909\u52d5\u3059\u308b\u30b5\u30a4\u30c8\u3067\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u898b\u3066\u3044\u308b\u9593\u306b\u6570\u5b57\u304c\u5909\u308f\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3067\u3082\u3001\u305a\u3063\u3068\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3057\u3066\u3044\u305f\u3089\u3046\u308b\u3055\u3044\u3067\u3059\u3002\u6700\u521d\u304b\u3089\u70b9\u6ec5\u3057\u3066\u3044\u305f\u3089\u300c\u4f55\u304c\u5909\u308f\u3063\u305f\u306e\uff1f\u300d\u3063\u3066\u308f\u304b\u308a\u307e\u305b\u3093\u3002\u5927\u4e8b\u306a\u306e\u306f\u300c\u3055\u3063\u304d\u3068\u9055\u3046\u300d\u3068\u3044\u3046\u5909\u5316\u306e\u77ac\u9593\u3092\u4f1d\u3048\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3042\u308b\u6848\u4ef6\u3067\u3001\u5e38\u306b\u30d1\u30eb\u30b9\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u3064\u3051\u305f\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u898b\u305b\u305f\u3089\u300c\u305a\u3063\u3068\u52d5\u3044\u3066\u3044\u3066\u3001\u5e83\u544a\u307f\u305f\u3044\u3067\u5acc\u3060\u300d\u3068\u8a00\u308f\u308c\u307e\u3057\u305f\u3002\u3002\u5909\u308f\u3063\u305f\u77ac\u9593\u3060\u3051\u52d5\u304f\u3088\u3046\u306b\u3057\u305f\u3089\u3001\u300c\u3053\u308c\u306a\u3089\u5b89\u5fc3\u611f\u304c\u3042\u308b\u300d\u3068\u8a00\u3063\u3066\u304f\u308c\u307e\u3057\u305f\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\">HTML\u306f\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002\u6570\u5b57\u3092\u8868\u793a\u3059\u308b\u8981\u7d20\u306b\u3001<code>data-stock<\/code>\u5c5e\u6027\u3092\u3064\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;div class=\"stock-display\" id=\"js-stock\"&gt;\n  &lt;span class=\"stock-label\"&gt;\u7a7a\u304d\u67a0&lt;\/span&gt;\n  &lt;span class=\"stock-number\" id=\"js-stock-number\" data-stock=\"5\"&gt;5&lt;\/span&gt;\n  &lt;span class=\"stock-unit\"&gt;\u4ef6&lt;\/span&gt;\n&lt;\/div&gt;\n\n&lt;div class=\"stock-display\" id=\"js-stock-room\"&gt;\n  &lt;span class=\"stock-label\"&gt;\u6b8b\u308a&lt;\/span&gt;\n  &lt;span class=\"stock-number\" id=\"js-stock-room-number\" data-stock=\"3\"&gt;3&lt;\/span&gt;\n  &lt;span class=\"stock-unit\"&gt;\u90e8\u5c4b&lt;\/span&gt;\n&lt;\/div&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">CSS\u30b9\u30bf\u30a4\u30eb<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306f2\u3064\u3042\u308a\u307e\u3059\u30021\u3064\u306f\u80cc\u666f\u306e\u30d5\u30a7\u30fc\u30c9\u3001\u3082\u30461\u3064\u306f\u6570\u5b57\u304c\u5c11\u3057\u5927\u304d\u304f\u306a\u308b\u52d5\u304d\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>.stock-display {\n  display: inline-flex;\n  align-items: baseline;\n  gap: 4px;\n  font-size: 14px;\n  color: #333;\n}\n\n.stock-number {\n  font-size: 28px;\n  font-weight: 700;\n  font-variant-numeric: tabular-nums;\n  min-width: 2ch;\n  text-align: center;\n  transition: background-color 0.3s ease;\n  border-radius: 4px;\n  padding: 2px 6px;\n}\n\n.stock-number.is-updating {\n  animation: stock-flash 0.6s ease-out;\n}\n\n@keyframes stock-flash {\n  0% {\n    background-color: rgba(34, 197, 94, 0.2);\n    transform: scale(1.15);\n  }\n  100% {\n    background-color: transparent;\n    transform: scale(1);\n  }\n}\n\n@media (prefers-reduced-motion: reduce) {\n  .stock-number.is-updating {\n    animation: none;\n    background-color: rgba(34, 197, 94, 0.15);\n    transition: background-color 0.8s ease-out;\n  }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>font-variant-numeric: tabular-nums<\/code>\u306f\u3001\u6570\u5b57\u306e\u5e45\u3092\u63c3\u3048\u308b\u305f\u3081\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u3059\u3002\u6570\u5b57\u304c\u5909\u308f\u3063\u305f\u3068\u304d\u306b\u30ec\u30a4\u30a2\u30a6\u30c8\u304c\u30ac\u30bf\u3064\u304b\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\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\">IntersectionObserver\uff08\u8981\u7d20\u304c\u753b\u9762\u306b\u898b\u3048\u3066\u3044\u308b\u304b\u3092\u691c\u77e5\u3059\u308bAPI\uff09\u3068MutationObserver\uff08DOM\u306e\u5909\u66f4\u3092\u691c\u77e5\u3059\u308bAPI\uff09\u3092\u7d44\u307f\u5408\u308f\u305b\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>document.addEventListener('DOMContentLoaded', () =&gt; {\n  const stockNumbers = document.querySelectorAll('.stock-number');\n  const visibleSet = new Set();\n\n  \/\/ \u753b\u9762\u306b\u898b\u3048\u3066\u3044\u308b\u304b\u3092\u76e3\u8996\n  const io = new IntersectionObserver((entries) =&gt; {\n    entries.forEach((entry) =&gt; {\n      if (entry.isIntersecting) {\n        visibleSet.add(entry.target);\n      } else {\n        visibleSet.delete(entry.target);\n      }\n    });\n  }, { threshold: 0.5 });\n\n  stockNumbers.forEach((el) =&gt; io.observe(el));\n\n  \/\/ data-stock\u5c5e\u6027\u306e\u5909\u66f4\u3092\u76e3\u8996\n  const mo = new MutationObserver((mutations) =&gt; {\n    mutations.forEach((mutation) =&gt; {\n      if (mutation.attributeName !== 'data-stock') return;\n      const el = mutation.target;\n\n      \/\/ \u753b\u9762\u306b\u898b\u3048\u3066\u3044\u306a\u3044\u306a\u3089\u6570\u5b57\u3060\u3051\u66f4\u65b0\n      if (!visibleSet.has(el)) {\n        el.textContent = el.dataset.stock;\n        return;\n      }\n\n      \/\/ \u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u6f14\u51fa\n      const oldVal = parseInt(el.textContent, 10);\n      const newVal = parseInt(el.dataset.stock, 10);\n      if (oldVal === newVal) return;\n\n      animateCount(el, oldVal, newVal);\n    });\n  });\n\n  stockNumbers.forEach((el) =&gt; {\n    mo.observe(el, { attributes: true, attributeFilter: ['data-stock'] });\n  });\n\n  function animateCount(el, from, to) {\n    const duration = 400;\n    const start = performance.now();\n    const diff = to - from;\n\n    el.classList.add('is-updating');\n\n    function step(now) {\n      const progress = Math.min((now - start) \/ duration, 1);\n      const eased = 1 - Math.pow(1 - progress, 3);\n      const current = Math.round(from + diff * eased);\n      el.textContent = current;\n\n      if (progress &lt; 1) {\n        requestAnimationFrame(step);\n      } else {\n        el.textContent = to;\n        setTimeout(() =&gt; el.classList.remove('is-updating'), 200);\n      }\n    }\n\n    requestAnimationFrame(step);\n  }\n});<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u30dd\u30a4\u30f3\u30c8\u306f<code>visibleSet<\/code>\u3067\u3059\u3002IntersectionObserver\u3067\u753b\u9762\u306b\u898b\u3048\u3066\u3044\u308b\u8981\u7d20\u3060\u3051\u3092Set\u306b\u5165\u308c\u3066\u304a\u3044\u3066\u3001MutationObserver\u3067data-stock\u304c\u5909\u308f\u3063\u305f\u3068\u304d\u306b\u300c\u898b\u3048\u3066\u3044\u308b\u304b\uff1f\u300d\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002\u898b\u3048\u3066\u3044\u306a\u3051\u308c\u3070\u9759\u304b\u306b\u66f4\u65b0\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u306f<code>requestAnimationFrame<\/code>\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002400ms\u304b\u3051\u3066\u3001\u53e4\u3044\u6570\u5b57\u304b\u3089\u65b0\u3057\u3044\u6570\u5b57\u307e\u3067\u30a4\u30fc\u30b8\u30f3\u30b0\u3067\u5909\u5316\u3057\u307e\u3059\u300260fps\u3067\u6ed1\u3089\u304b\u306b\u52d5\u304d\u307e\u3059\u3002<\/p>\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<code>prefers-reduced-motion<\/code>\u3067\u3059\u3002\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u304c\u82e6\u624b\u306a\u30e6\u30fc\u30b6\u30fc\u306e\u305f\u3081\u306b\u3001CSS\u3067\u52d5\u304d\u3092\u7121\u52b9\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u4ee3\u308f\u308a\u306b\u80cc\u666f\u8272\u3060\u3051\u304c\u3086\u3063\u304f\u308a\u5909\u308f\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\u3064\u76ee\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3067\u3059\u3002MutationObserver\u306f<code>attributeFilter<\/code>\u3067<code>data-stock<\/code>\u3060\u3051\u3092\u76e3\u8996\u3057\u3066\u3044\u307e\u3059\u3002\u4ed6\u306e\u5c5e\u6027\u306e\u5909\u66f4\u306b\u306f\u53cd\u5fdc\u3057\u307e\u305b\u3093\u3002IntersectionObserver\u306e<code>threshold<\/code>\u306f0.5\u306b\u3057\u3066\u3001\u534a\u5206\u4ee5\u4e0a\u898b\u3048\u3066\u3044\u308b\u3068\u304d\u3060\u3051\u53cd\u5fdc\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3\u3064\u76ee\u306f<code>font-variant-numeric: tabular-nums<\/code>\u3067\u3059\u3002\u6570\u5b57\u306e\u5e45\u304c\u5909\u308f\u308b\u30d5\u30a9\u30f3\u30c8\uff08\u30d7\u30ed\u30dd\u30fc\u30b7\u30e7\u30ca\u30eb\u6570\u5b57\uff09\u3060\u3068\u30011\u30688\u3067\u5e45\u304c\u9055\u3063\u3066\u3001\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u4e2d\u306b\u30ac\u30bf\u30ac\u30bf\u52d5\u304d\u307e\u3059\u3002<code>tabular-nums<\/code>\u3067\u7b49\u5e45\u306b\u3059\u308b\u3068\u3001\u5b89\u5b9a\u3057\u3066\u52d5\u304d\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\u30924\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>\u6f14\u51fa\u306a\u3057\uff08A\uff09<\/th><th>\u6f14\u51fa\u3042\u308a\uff08B\uff09<\/th><th>\u5dee\u5206<\/th><\/tr><\/thead><tbody><tr><td>\u7a7a\u304d\u67a0\u5909\u52d5\u306e\u8a8d\u77e5\u7387<\/td><td>31.2%<\/td><td>54.8%<\/td><td>+23.6pt<\/td><\/tr><tr><td>\u4e88\u7d04\u5b8c\u4e86\u7387<\/td><td>12.4%<\/td><td>14.9%<\/td><td>+2.5pt<\/td><\/tr><tr><td>\u30da\u30fc\u30b8\u5e73\u5747\u6ede\u5728\u6642\u9593<\/td><td>48\u79d2<\/td><td>55\u79d2<\/td><td>+7\u79d2<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u7a7a\u304d\u67a0\u5909\u52d5\u306e\u8a8d\u77e5\u7387\u304c23.6\u30dd\u30a4\u30f3\u30c8\u4e0a\u304c\u308a\u307e\u3057\u305f\u3002\u300c\u7a7a\u304d\u67a0\u304c\u5909\u308f\u3063\u305f\u3053\u3068\u306b\u6c17\u3065\u304d\u307e\u3057\u305f\u304b\uff1f\u300d\u3068\u3044\u3046\u30a2\u30f3\u30b1\u30fc\u30c8\u306e\u7d50\u679c\u3067\u3059\u3002\u4e88\u7d04\u5b8c\u4e86\u7387\u30822.5\u30dd\u30a4\u30f3\u30c8\u4e0a\u304c\u308a\u307e\u3057\u305f\u3002\u7126\u3089\u305b\u306a\u3044\u6f14\u51fa\u3067\u3082\u3001\u5909\u5316\u306b\u6c17\u3065\u3044\u3066\u3082\u3089\u3048\u308b\u3068\u884c\u52d5\u306b\u3064\u306a\u304c\u308b\u3088\u3046\u3067\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\u8868\u793a\u3059\u308b\u5546\u54c1\u306e\u7a2e\u985e\u3084\u30e6\u30fc\u30b6\u30fc\u5c64\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\">\u5728\u5eab\u30fb\u7a7a\u304d\u67a0\u306e\u6570\u5b57\u306f\u3001\u5909\u308f\u3063\u305f\u3053\u3068\u306b\u6c17\u3065\u3044\u3066\u3082\u3089\u3048\u306a\u3044\u3068\u610f\u5473\u304c\u306a\u3044\u3067\u3059\u3002\u3067\u3082\u5e38\u306b\u52d5\u3044\u3066\u3044\u305f\u3089\u5e83\u544a\u307f\u305f\u3044\u3067\u9006\u52b9\u679c\u3002\u300c\u5909\u308f\u3063\u305f\u77ac\u9593\u3060\u3051\u300d\u304c\u30dd\u30a4\u30f3\u30c8\u3067\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>IntersectionObserver\u3067\u300c\u898b\u3048\u3066\u3044\u308b\u3068\u304d\u300d\u3060\u3051\u6f14\u51fa\u3059\u308b\u3002\u753b\u9762\u5916\u3067\u306f\u9759\u304b\u306b\u66f4\u65b0<\/li>\n<li>MutationObserver\u3067data-stock\u5c5e\u6027\u306e\u5909\u66f4\u3092\u691c\u77e5\u3002\u30dd\u30fc\u30ea\u30f3\u30b0\u3088\u308a\u52b9\u7387\u7684<\/li>\n<li>\u30ab\u30a6\u30f3\u30c8\u30a2\u30c3\u30d7\u306f400ms\u3001\u80cc\u666f\u30d5\u30a7\u30fc\u30c9\u306f0.6\u79d2\u3002<code>prefers-reduced-motion<\/code>\u306b\u5bfe\u5fdc<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u304a\u5ba2\u3055\u307e\u304b\u3089\u306f\u300c\u30e6\u30fc\u30b6\u30fc\u304c\u7126\u3089\u305a\u306b\u3001\u3067\u3082\u7a7a\u304d\u304c\u6e1b\u3063\u305f\u3053\u3068\u306b\u3061\u3083\u3093\u3068\u6c17\u3065\u3044\u3066\u304f\u308c\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u300d\u3068\u559c\u3093\u3067\u304f\u308c\u307e\u3057\u305f\u3002\u3002<\/p>\n\n\n\n<p 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[&hellip;]<\/p>\n","protected":false},"author":21,"featured_media":10107,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[316],"tags":[33,32,22,317],"class_list":["post-10075","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ui-ux","tag-css","tag-html","tag-javascript","tag-ui-ux"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- 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