{"id":495,"date":"2023-06-27T17:55:55","date_gmt":"2023-06-27T08:55:55","guid":{"rendered":"https:\/\/fastest.jp\/blog\/?p=495"},"modified":"2023-06-27T17:56:01","modified_gmt":"2023-06-27T08:56:01","slug":"cumulative-layout-shift","status":"publish","type":"post","link":"https:\/\/fastest.jp\/blog\/cumulative-layout-shift\/","title":{"rendered":"Core Web Vitals \u306e\u6307\u6a19 CLS \u3068\u306f\uff1f\u6982\u8981\u3068\u6539\u5584\u65b9\u6cd5\u3092\u89e3\u8aac"},"content":{"rendered":"\n

Cumulative Layout Shift\uff08\u4ee5\u4e0b\u3001CLS\uff09\u306f\u3001Core Web Vitals \u306e\u6307\u6a19\u306e\u4e00\u3064\u3067\u3059\u3002<\/p>\n\n\n\n

\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u306e\u969b\u306b\u767a\u751f\u3059\u308b\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u3092\u8a55\u4fa1\u3059\u308b\u6307\u6a19\u306e\u3053\u3068\u3067\u3001CLS \u306e\u30b9\u30b3\u30a2\u306f\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u306e\u8cea\u306b\u76f4\u7d50\u3057\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\u4f8b\u3048\u3070\u3001Web \u30b5\u30a4\u30c8\u3067\u3042\u308b\u30ea\u30f3\u30af\u3092\u30af\u30ea\u30c3\u30af\u3057\u3088\u3046\u3068\u3057\u305f\u3068\u3053\u308d\u3001\u4e0a\u90e8\u306b\u5e83\u544a\u304c\u9045\u308c\u3066\u8868\u793a\u3055\u308c\u3001\u5168\u3066\u306e\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u4e0b\u90e8\u306b\u79fb\u52d5\u3057\u307e\u3057\u305f\u3002
\u305d\u306e\u7d50\u679c\u3001\u672c\u6765\u30af\u30ea\u30c3\u30af\u3057\u3088\u3046\u3068\u3057\u305f\u30ea\u30f3\u30af\u3067\u306f\u306a\u304f\u3001\u5e83\u544a\u3092\u8aa4\u30af\u30ea\u30c3\u30af\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002
\u3053\u308c\u306b\u3088\u308a\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u671b\u3093\u3067\u3044\u306a\u3044\u30da\u30fc\u30b8\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3055\u308c\u3001\u623b\u3063\u3066\u76ee\u7684\u306e\u30ea\u30f3\u30af\u3092\u518d\u5ea6\u63a2\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u3053\u306e\u3088\u3046\u306a\u8aa4\u30af\u30ea\u30c3\u30af\u304c\u767a\u751f\u3059\u308b\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u30b5\u30a4\u30c8\u306e\u95b2\u89a7\u306b\u30b9\u30c8\u30ec\u30b9\u3092\u611f\u3058\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u76f4\u5e30\u7387\u306e\u5411\u4e0a\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002
\u305d\u306e\u305f\u3081\u3001\u30c7\u30b8\u30bf\u30eb\u30de\u30fc\u30b1\u30c6\u30a3\u30f3\u30b0\u306b\u304a\u3044\u3066 CLS \u306e\u6539\u5584\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002<\/span><\/p>\n\n\n\n

\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001CLS \u306e\u6982\u8981\u3068\u78ba\u8a8d\u65b9\u6cd5\u3001\u4f4e\u4e0b\u8981\u56e0\u304b\u3089\u6539\u5584\u65b9\u6cd5\u307e\u3067\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n\n\n

CLS \u3068\u306f<\/h2>\n\n\n\n

\u3053\u306e\u7ae0\u3067\u306f\u3001CLS \u306e\u6982\u8981\u3068\u91cd\u8981\u6027\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

CLS \u306e\u6982\u8981<\/h3>\n\n\n\n

CLS \u306f\u3001\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u306b\u5fdc\u3058\u3066\u767a\u751f\u3059\u308b\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u3067\u3059\u3002
\u30e6\u30fc\u30b6\u30fc\u304c\u30da\u30fc\u30b8\u5185\u306e\u60c5\u5831\u3092\u8aad\u3093\u3067\u3044\u308b\u9014\u4e2d\u306b\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u304c\u751f\u3058\u308b\u3068\u3001\u3069\u3053\u3092\u8aad\u3093\u3067\u3044\u308b\u304b\u308f\u304b\u3089\u306a\u304f\u306a\u308a\u307e\u3059\u3002
\u307e\u305f\u3001\u30ea\u30f3\u30af\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u969b\u306b\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u304c\u751f\u3058\u308b\u3068\u3001\u8aa4\u3063\u305f\u30ea\u30f3\u30af\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

CLS \u306e\u30b9\u30b3\u30a2\u306f\u300c\u5f71\u97ff\u3092\u53d7\u3051\u305f\u9762\u7a4d\u306e\u5272\u5408\u00d7\u79fb\u52d5\u3057\u305f\u8ddd\u96e2\u306e\u5272\u5408\u300d\u3067\u8868\u3055\u308c\u307e\u3059\u3002<\/span>
\u4ee5\u4e0b\u306b CLS \u306e\u30b9\u30b3\u30a2\u306e\u8a08\u7b97\u4f8b\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n

\n
\"Cumulative<\/figure>\n<\/div>\n\n\n

\u753b\u50cf\u5f15\u7528\u5143\uff1aCumulative Layout Shift (CLS) \u2013 Web.dev<\/a><\/p>\n\n\n\n

\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u306e50%\u3092\u5360\u3081\u3066\u3044\u308b\u8981\u7d20\u304c\u3042\u308a\u307e\u3059\u3002
\u305d\u3057\u3066\u305d\u306e\u8981\u7d20\u304c25%\u4e0b\u65b9\u5411\u306b\u79fb\u52d5\u3057\u305f\u3068\u3057\u307e\u3059\u3002
\u3053\u306e\u5834\u5408\u3001\u5f71\u97ff\u3092\u53d7\u3051\u305f\u9762\u7a4d\u306e\u5272\u5408\u306f50%+25%\u306775%\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u307e\u305f\u3001\u79fb\u52d5\u3057\u305f\u8ddd\u96e2\u306e\u5272\u5408\u306f25%\u306a\u306e\u3067\u3001CLS \u306e\u30b9\u30b3\u30a2\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u5f71\u97ff\u3092\u53d7\u3051\u305f\u9762\u7a4d\u306e\u5272\u5408 75% \u00d7 \u79fb\u52d5\u3057\u305f\u8ddd\u96e2\u306e\u5272\u5408 25% = CLS 18.75% = 0.1875<\/p>\n\n\n\n

CLS \u306e\u30b9\u30b3\u30a2\u304c0.1\u4ee5\u4e0b\u3067\u3042\u308c\u3070\u3001\u826f\u597d\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/span><\/p>\n\n\n

\n
\"Cumulative<\/figure>\n<\/div>\n\n\n

CLS \u306e\u91cd\u8981\u6027<\/h3>\n\n\n\n

CLS \u306f\u3001Google \u304c\u5b9a\u3081\u308b Web \u4e0a\u3067\u306e\u30e6\u30fc\u30b6\u30fc\u30a8\u30af\u30b9\u30da\u30ea\u30a8\u30f3\u30b9\uff08UX\uff09\u306e\u8cea\u3092\u8a55\u4fa1\u3059\u308b\u6307\u6a19\u3067\u3042\u308b Core Web Vitals \u306e\u3072\u3068\u3064\u3067\u3059\u3002<\/span>
CLS \u306e\u8a55\u4fa1\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u4e0a\u3067\u306e\u4f53\u9a13\u3060\u3051\u3067\u306a\u304f\u3001SEO \u65bd\u7b56\u306b\u3082\u5f71\u97ff\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

Core Web Vitals \u306f Web \u30b5\u30a4\u30c8\u304c\u30e6\u30fc\u30b6\u30fc\u306b\u3068\u3063\u3066\u3069\u308c\u3060\u3051\u4f7f\u3044\u3084\u3059\u3044\u304b\u3092\u8a55\u4fa1\u3059\u308b\u6307\u6a19\u3067\u3059\u3002
Google \u306f\u691c\u7d22\u9806\u4f4d\u306e\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306b Core Web Vitals \u306e\u6307\u6a19\u3092\u53d6\u308a\u5165\u308c\u3066\u3044\u307e\u3059\u3002
\u305d\u306e\u305f\u3081\u3001Core Web Vitals \u306e\u6307\u6a19\u306f SEO \u65bd\u7b56\u306b\u91cd\u8981\u3067\u3059\u3002<\/span><\/p>\n\n\n\n

Core Web Vitals \u306b\u306f\u3001CLS \u4ee5\u5916\u306b\u30822\u3064\u306e\u6307\u6a19\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

First Input Delay\uff08FID\uff09<\/h4>\n\n\n\n

FID \u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u30da\u30fc\u30b8\u4e0a\u3067\u521d\u3081\u3066\u30a2\u30af\u30b7\u30e7\u30f3\u3092\u884c\u3063\u305f\u3068\u304d\u306b\u3001\u30d6\u30e9\u30a6\u30b6\u304c\u5fdc\u7b54\u3059\u308b\u307e\u3067\u306b\u304b\u304b\u308b\u6642\u9593\u3067\u3059\u3002<\/span>
FID \u306e\u30b9\u30b3\u30a2\u306f\u30df\u30ea\u79d2\u3067\u8868\u793a\u3055\u308c\u3001FID \u304c100\u30df\u30ea\u79d2\u4ee5\u4e0b\u3067\u3042\u308c\u3070\u3001\u826f\u597d\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

Largest Contentful Paint\uff08LCP\uff09<\/h4>\n\n\n\n

LCP \u3068\u306f\u3001\u30da\u30fc\u30b8\u5185\u306e\u6700\u3082\u30d5\u30a1\u30a4\u30eb\u5bb9\u91cf\u306e\u5927\u304d\u3044\u753b\u50cf\u3084\u52d5\u753b\u304c\u8868\u793a\u3055\u308c\u308b\u307e\u3067\u306e\u6642\u9593\u306e\u3053\u3068\u3067\u3059\u3002<\/span>
LCP \u306e\u30b9\u30b3\u30a2\u306f\u79d2\u6570\u3067\u8868\u793a\u3055\u308c\u3001LCP \u304c2.5\u79d2\u4ee5\u4e0b\u3067\u3042\u308c\u3070\u3001\u826f\u597d\u3068\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n

LCP \u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u4ee5\u4e0b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002
\u3010\u53c2\u8003\u3011Core Web Vitals \u306e\u6307\u6a19 LCP \u3068\u306f\uff1f\u6982\u8981\u304b\u3089\u6539\u5584\u65b9\u6cd5\u307e\u3067\u89e3\u8aac
https:\/\/fastest.jp\/blog\/largest-contentful-paint\/<\/a><\/p>\n\n\n\n

CLS \u3092\u6e2c\u5b9a\u3067\u304d\u308b\u30c4\u30fc\u30eb<\/h2>\n\n\n\n

Google \u306f CLS \u3092\u542b\u3080 Core Web Vitals \u306e\u6e2c\u5b9a\u30c4\u30fc\u30eb\u3092\u63d0\u4f9b\u3057\u3066\u304a\u308a\u3001\u4ee3\u8868\u7684\u306a\u30c4\u30fc\u30eb\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e4\u3064\u304c\u3042\u3052\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n

\u30fbGoogle Search Console
\u30fbPageSpeed Insights
\u30fbWeb Vitals
\u30fbLighthouse<\/p>\n\n\n\n

Google Search Console<\/h3>\n\n\n\n

Google Search Console<\/a> \u306f\u3001<\/span>Goolge \u691c\u7d22\u3067\u306e Web \u30b5\u30a4\u30c8\u306e\u63b2\u8f09\u9806\u4f4d\u3084\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u7ba1\u7406\u3067\u304d\u308b\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/span><\/p>\n\n\n\n

CLS \u3092\u78ba\u8a8d\u3059\u308b\u306b\u306f\u3001\u300c\u30a6\u30a7\u30d6\u306b\u95a2\u3059\u308b\u4e3b\u306a\u6307\u6a19\u300d\u3092\u9078\u629e\u3057\u300c\u30ec\u30dd\u30fc\u30c8\u3092\u958b\u304f\u300d\u3092\u30af\u30ea\u30c3\u30af\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\"Google<\/figure>\n\n\n\n

\u300c\u826f\u597d\u306a URL \u3068\u5224\u65ad\u3055\u308c\u306a\u304b\u3063\u305f\u7406\u7531\u300d\u306e\u300c CLS \u306b\u95a2\u3059\u308b\u554f\u984c\u300d\u3068\u3042\u308b\u3082\u306e\u3092\u9078\u629e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\"Google<\/figure>\n\n\n\n

CLS \u306b\u95a2\u3059\u308b\u554f\u984c\u304c\u3042\u308b\u3068\u3055\u308c\u305f URL \u30b0\u30eb\u30fc\u30d7\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\"Google<\/figure>\n\n\n\n

\u30c7\u30d9\u30ed\u30c3\u30d1\u30fc\u5411\u3051\u30ea\u30bd\u30fc\u30b9\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001PageSpeed Insights \u3067\u3001\u8a72\u5f53\u306e\u30da\u30fc\u30b8\u306e\u8a73\u7d30\u306a\u5206\u6790\u30ec\u30dd\u30fc\u30c8\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\"Google<\/figure>\n\n\n\n

PageSpeed Insights \u306b\u3064\u3044\u3066\u306f\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

PageSpeed Insights<\/h3>\n\n\n\n
\"PageSpeed<\/figure>\n\n\n\n

PageSpeed Insights<\/a> \u306f\u3001<\/span>Web \u30b5\u30a4\u30c8\u306e\u30da\u30fc\u30b8\u306e\u8868\u793a\u901f\u5ea6\u306e\u6e2c\u5b9a\u3084\u6539\u5584\u70b9\u3092\u628a\u63e1\u3067\u304d\u308b\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/span><\/p>\n\n\n\n

LCP \u306f PageSpeed insights \u306e\u30ec\u30dd\u30fc\u30c8\u306e\u3001\u300c\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u554f\u984c\u3092\u8a3a\u65ad\u3059\u308b\u300d\u5185\u306e\u300c\u6307\u6a19\u300d\u3067\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\u307e\u305f\u3001\u6539\u5584\u3067\u304d\u308b\u9805\u76ee\u3067\u306f\u3001\u5b9f\u969b\u306b\u5404\u6307\u6a19\u306e\u30b9\u30b3\u30a2\u304c\u4f4e\u3044\u539f\u56e0\u3068\u6539\u5584\u65b9\u6cd5\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

\"Cumulative<\/figure>\n\n\n\n

\u672b\u5c3e\u306b CLS \u3068\u66f8\u3044\u3066\u3042\u308b\u3082\u306e\u304c\u8a72\u5f53\u3059\u308b\u9805\u76ee\u3067\u3059\u3002
\u3053\u3053\u3067\u306f\u3001\u300c\u753b\u50cf\u306e width \u3068 height \u304c\u660e\u793a\u7684\u306b\u6307\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u300d\u3068\u3042\u308a\u307e\u3059\u3002
\u5177\u4f53\u7684\u306a\u6539\u5584\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u5f8c\u307b\u3069\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

Web Vitals<\/h3>\n\n\n\n
\"Web<\/figure>\n\n\n\n

Web Vitals<\/a> \u306f Google Chrome \u306e\u62e1\u5f35\u6a5f\u80fd\u3067\u3059\u3002
\u8a08\u6e2c\u5bfe\u8c61\u306e Web \u30b5\u30a4\u30c8\u304b\u3089\u62e1\u5f35\u6a5f\u80fd\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001CLS \u306e\u30b9\u30b3\u30a2\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

Lighthouse<\/h3>\n\n\n\n
\"Lighthouse\u306eCLS\u30b9\u30b3\u30a2\u78ba\u8a8d\u65b9\u6cd5\"<\/figure>\n\n\n\n

Lighthouse<\/a> \u3082 Web Vitals \u540c\u69d8\u306b Google \u306e\u62e1\u5f35\u6a5f\u80fd\u3067\u3059\u3002
Web \u30b5\u30a4\u30c8\u306e\u30da\u30fc\u30b8\u30b9\u30d4\u30fc\u30c9\u3092\u8a55\u4fa1\u3059\u308b Performance \u304b\u3089\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002
\u306a\u304a\u3001\u3053\u306e\u9805\u76ee\u3067\u8a55\u4fa1\u3055\u308c\u308b\u6307\u6a19\u306f PaageSpeed Insights \u3068\u540c\u3058\u3067\u3059\u3002<\/span><\/p>\n\n\n\n

Lighthouse \u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u65b9\u306f\u3001\u4ee5\u4e0b\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002
https:\/\/fastest.jp\/blog\/lighthouse-howto\/#d0e9d87eb78fa54e47cd213ca7606442<\/a><\/p>\n\n\n\n

CLS \u306e\u4f4e\u4e0b\u8981\u56e0<\/h2>\n\n\n\n

\u3053\u306e\u7ae0\u3067\u306f\u3001CLS \u306e\u4f4e\u4e0b\u8981\u56e0\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002
CLS \u306e\u4f4e\u4e0b\u8981\u56e0\u306f\u3001\u4e3b\u306b\u4ee5\u4e0b\u306e4\u3064\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u30fb\u753b\u50cf\u3084\u52d5\u753b\u306e\u30b5\u30a4\u30ba\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044
\u30fb\u52d5\u7684\u306b\u633f\u5165\u3055\u308c\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u3042\u308b
\u30fbFOIT\/FOUT \u306e\u539f\u56e0\u3068\u306a\u308b Web \u30d5\u30a9\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b
\u30fb\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b<\/p>\n\n\n\n

\u9806\u306b\u89e3\u8aac\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u753b\u50cf\u3084\u52d5\u753b\u306e\u30b5\u30a4\u30ba\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044<\/h3>\n\n\n\n

\u52d5\u753b\u5f15\u7528\u5143\uff1aCumulative Layout Shift \u3092\u6700\u9069\u5316\u3059\u308b \u2013 Web.dev<\/a><\/p>\n\n\n\n

\u30da\u30fc\u30b8\u306e\u5185\u5bb9\u304c\u753b\u9762\u306b\u8868\u793a\u3055\u308c\u308b\u969b\u3001\u30d5\u30a1\u30a4\u30eb\u5bb9\u91cf\u306e\u5c0f\u3055\u3044\u30c6\u30ad\u30b9\u30c8\u304c\u512a\u5148\u7684\u306b\u8868\u793a\u3055\u308c\u3001\u305d\u306e\u5f8c\u753b\u50cf\u3084\u52d5\u753b\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/span>
\u3053\u306e\u6642\u306b\u3001\u753b\u50cf\u3084\u52d5\u753b\u306e\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3057\u3066\u3044\u306a\u3044\u3068\u8868\u793a\u3059\u308b\u9818\u57df\u3092\u4e8b\u524d\u306b\u78ba\u4fdd\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/span>
\u305d\u306e\u7d50\u679c\u3001\u753b\u50cf\u3084\u52d5\u753b\u304c\u8868\u793a\u3055\u308c\u308b\u969b\u306b\u30c6\u30ad\u30b9\u30c8\u306e\u4f4d\u7f6e\u304c\u30ba\u30ec\u307e\u3059\u3002<\/p>\n\n\n\n

\u52d5\u7684\u306b\u633f\u5165\u3055\u308c\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u3042\u308b<\/h3>\n\n\n\n

\u52d5\u753b\u5f15\u7528\u5143\uff1aCumulative Layout Shift \u3092\u6700\u9069\u5316\u3059\u308b \u2013 Web.dev<\/a><\/p>\n\n\n\n

\u30e6\u30fc\u30b6\u30fc\u306e\u64cd\u4f5c\u306b\u5bfe\u3059\u308b\u5fdc\u7b54\u3068\u306f\u95a2\u4fc2\u306a\u304f\u30d3\u30e5\u30fc\u30dd\u30fc\u30c8\u5185\u306e\u4e0a\u90e8\u307e\u305f\u306f\u4e0b\u90e8\u306b\u30b3\u30f3\u30c6\u30f3\u30c4\u304c\u633f\u5165\u3055\u308c\u308b\u3068\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u304c\u751f\u3058\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\u30dd\u30c3\u30d7\u30a2\u30c3\u30d7\u306e\u8868\u793a\u3084\u3001\u6642\u9593\u7d4c\u904e\u306b\u5fdc\u3058\u3066\u8868\u793a\u3055\u308c\u308b\u5e83\u544a\u306a\u3069\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306e\u8208\u5473\u3092\u5f15\u304f\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u304c\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u306e\u539f\u56e0\u306b\u306a\u308b\u305f\u3081\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n

FOIT\/FOUT \u306e\u539f\u56e0\u3068\u306a\u308b Web \u30d5\u30a9\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b<\/h3>\n\n\n
\n
\"FOUT\u306e\u4f8b\"<\/figure>\n<\/div>\n\n\n

Prevent layout shifting and flashes of invisible text (FOIT) by preloading optional fonts \u2013 Web.dev<\/a> \u3092\u53c2\u8003\u306b\u4f5c\u6210<\/p>\n\n\n\n

Web \u30d5\u30a9\u30f3\u30c8\u3092\u5229\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001FOIT \u3084 FOUT \u306e\u539f\u56e0\u3068\u306a\u308b\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u30fbFOIT\uff08Flash of invisible text\uff09\uff1aWeb \u30d5\u30a9\u30f3\u30c8\u304c\u8868\u793a\u3055\u308c\u308b\u307e\u3067\u306e\u9593\u3001\u30c6\u30ad\u30b9\u30c8\u304c\u898b\u3048\u306a\u3044\u72b6\u614b\u306b\u306a\u308b\u73fe\u8c61\u3002<\/span>
\u30fbFOUT\uff08Flash of unstyled text\uff09\uff1aWeb \u30d5\u30a9\u30f3\u30c8\u304c\u8868\u793a\u3055\u308c\u308b\u307e\u3067\u306e\u9593\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30d5\u30a9\u30f3\u30c8\u304c\u8868\u793a\u3055\u308c\u3001\u5207\u308a\u66ff\u308f\u308b\u3053\u3068\u3067\u300c\u3061\u3089\u3064\u304d\u300d\u304c\u751f\u3058\u308b\u73fe\u8c61\u3002<\/span><\/p>\n\n\n\n

FOIT \u3084 FOUT \u306f CLS \u306e\u30b9\u30b3\u30a2\u3092\u4f4e\u4e0b\u3055\u305b\u308b\u8981\u56e0\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n

\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u4f7f\u7528<\/h3>\n\n\n\n

\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u4e2d\u306b\u306f CLS \u306e\u4f4e\u4e0b\u8981\u56e0\u3068\u306a\u308b CSS \u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5229\u7528\u3057\u305f\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002
\u4f8b\u3048\u3070\u30e6\u30fc\u30b6\u30fc\u306e\u64cd\u4f5c\u3067\u8981\u7d20\u304c\u79fb\u52d5\u3059\u308b\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u5834\u5408\u3001\u4ed6\u306e\u8981\u7d20\u3068\u91cd\u306a\u308a CLS \u306e\u30b9\u30b3\u30a2\u3092\u4f4e\u4e0b\u3055\u305b\u308b\u539f\u56e0\u3068\u306a\u308a\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

CLS \u306e\u6539\u5584\u65b9\u6cd5<\/h2>\n\n\n\n

\u524d\u306e\u7ae0\u3067\u306f\u3001CLS \u306e\u4f4e\u4e0b\u8981\u56e0\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002
\u3053\u306e\u7ae0\u3067\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u6539\u5584\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002
\u6539\u5584\u65b9\u6cd5\u306b\u3064\u3044\u3066\u306f\u3001\u5c02\u9580\u7684\u306a\u5185\u5bb9\u306b\u306a\u308b\u305f\u3081\u30a8\u30f3\u30b8\u30cb\u30a2\u3068\u76f8\u8ac7\u3057\u3066\u3054\u691c\u8a0e\u304f\u3060\u3055\u3044\u3002<\/span><\/p>\n\n\n\n

\u753b\u50cf\u3084\u52d5\u753b\u306e\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3059\u308b<\/h3>\n\n\n\n

\u753b\u50cf\u3084\u52d5\u753b\u306e\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3057\u3066\u304a\u304f\u3053\u3068\u3067\u3001\u8868\u793a\u3059\u308b\u305f\u3081\u306e\u9818\u57df\u3092\u4e8b\u524d\u306b\u78ba\u4fdd\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u3092\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/span>
\u753b\u50cf\u3084\u52d5\u753b\u306b width \u8981\u7d20\u3068 height \u8981\u7d20\u3092\u6307\u5b9a\u3059\u308b\u3001\u3082\u3057\u304f\u306f\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u7387\u3092\u6307\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u9759\u7684\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u5909\u66f4\u3059\u308b\uff0f\u8868\u793a\u30b9\u30da\u30fc\u30b9\u3092\u78ba\u4fdd\u3059\u308b<\/h3>\n\n\n\n

\u30e6\u30fc\u30b6\u30fc\u306e\u64cd\u4f5c\u306b\u5fdc\u7b54\u3059\u308b\u5834\u5408\u3092\u9664\u304d\u3001\u52d5\u7684\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u5229\u7528\u3092\u53ef\u80fd\u306a\u9650\u308a\u907f\u3051\u3066\u9759\u7684\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u5909\u66f4\u3057\u307e\u3057\u3087\u3046\u3002
\u52d5\u7684\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u5229\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u4e8b\u524d\u306b\u8868\u793a\u30b9\u30da\u30fc\u30b9\u3092\u78ba\u4fdd\u3059\u308b\u3053\u3068\u3067\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u3092\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

Web \u30d5\u30a9\u30f3\u30c8\u306e\u8aad\u307f\u8fbc\u307f\u3092\u6700\u9069\u5316\u3059\u308b<\/h3>\n\n\n\n

Web \u30d5\u30a9\u30f3\u30c8\u306e\u8aad\u307f\u8fbc\u307f\u3092\u6700\u9069\u5316\u3059\u308b\u306b\u306f\u3001font-display \u3092 CSS \u306b\u8a18\u8ff0\u3057\u305f\u308a Font Loading API \u3092\u5229\u7528\u3057\u307e\u3059\u3002
\u3053\u306e\uff12\u3064\u306f Web \u30d5\u30a9\u30f3\u30c8\u304c\u8aad\u307f\u8fbc\u307e\u308c\u308b\u307e\u3067\u306e\u6319\u52d5\u3092\u5236\u5fa1\u3057\u305f\u308a\u3001\u8aad\u307f\u8fbc\u307e\u308c\u308b\u307e\u3067\u306e\u6642\u9593\u306e\u77ed\u7e2e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

transform \u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5229\u7528\u3059\u308b<\/h3>\n\n\n\n

\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u306e\u8981\u56e0\u306b\u306a\u308b CSS \u30d7\u30ed\u30d1\u30c6\u30a3\u3067\u306f\u306a\u304f\u3001transform \u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u9069\u5207\u306b\u5236\u5fa1\u3067\u304d\u3001CLS \u306e\u30b9\u30b3\u30a2\u3092\u6539\u5584\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/span><\/p>\n\n\n\n

\u307e\u3068\u3081<\/h2>\n\n\n\n

\u672c\u8a18\u4e8b\u3067\u306f\u3001Core Web Vitals \u306e\u6307\u6a19\u3067\u3042\u308b CLS \u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

CLS \u306f\u3001\u30da\u30fc\u30b8\u306e\u8aad\u307f\u8fbc\u307f\u306b\u5fdc\u3058\u3066\u767a\u751f\u3059\u308b\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u3067\u3059\u3002
\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u304c\u751f\u3058\u308b\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u8aad\u3093\u3067\u3044\u308b\u7b87\u6240\u304c\u5206\u304b\u3089\u306a\u304f\u306a\u3063\u305f\u308a\u3001\u8aa4\u3063\u305f\u30ea\u30f3\u30af\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002
\u30ec\u30a4\u30a2\u30a6\u30c8\u306e\u30ba\u30ec\u306f\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u3092\u60aa\u304f\u3059\u308b\u305f\u3081\u3001\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u7387\u306e\u4f4e\u4e0b\u3084\u76f4\u5e30\u7387\u306e\u5411\u4e0a\u306b\u7e4b\u304c\u308a\u307e\u3059\u3002
\u305d\u306e\u305f\u3081\u3001CLS \u306e\u6539\u5584\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n

CLS \u306e\u6539\u5584\u306f CSS \u306e\u4fee\u6b63\u304c\u5fc5\u8981\u306b\u306a\u308b\u305f\u3081\u3001\u96e3\u3057\u3044\u3068\u611f\u3058\u308b\u65b9\u3082\u591a\u3044\u3068\u601d\u3044\u307e\u3059\u3002
CLS \u306e\u6539\u5584\u306b\u60a9\u3093\u3067\u3044\u308b\u65b9\u306f\u3001\u30a8\u30f3\u30b8\u30cb\u30a2\u306e\u65b9\u3068\u76f8\u8ac7\u3057\u512a\u5148\u5ea6\u306e\u9ad8\u3044\u3082\u306e\u304b\u3089\u59cb\u3081\u308b\u3053\u3068\u3092\u3054\u691c\u8a0e\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n

CLS \u3092\u6539\u5584\u3057\u3066 Web \u30b5\u30a4\u30c8\u306e\u76f4\u5e30\u7387\u306e\u6539\u5584\u3084 SEO \u306b\u7e4b\u3052\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n

\u306a\u304a\u3001\u5f53\u793e\u3067\u306f\u30da\u30fc\u30b8\u306e\u8868\u793a\u901f\u5ea6\u306e\u6539\u5584\u30921\u30af\u30ea\u30c3\u30af\u3067\u884c\u3048\u308b\u30e9\u30f3\u30c7\u30a3\u30f3\u30b0\u30da\u30fc\u30b8\u9ad8\u901f\u5316\u30c4\u30fc\u30eb FasTest\uff08\u30d5\u30a1\u30fc\u30b9\u30c6\u30b9\u30c8\uff09 \u3092\u958b\u767a\u30fb\u8ca9\u58f2\u3057\u3066\u3044\u307e\u3059\u3002
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