\u5165\u529b\u3057\u305f2\u8272\u306e\u78ba\u8a8d\u3068\u3001\u5b9f\u30da\u30fc\u30b8\u3067\u306e\u8868\u793a\u78ba\u8a8d\u306f\u5206\u3051\u3066\u884c\u3044\u307e\u3059\u3002\u5019\u88dc\u8272\u3092\u63a1\u7528\u3057\u305f\u3089\u3001\u5b9f\u969b\u306e\u80cc\u666f\u30fb\u6587\u5b57\u30b5\u30a4\u30ba\u30fb\u64cd\u4f5c\u72b6\u614b\u3067\u3082\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n
\u958b\u767a\u8005\u30c4\u30fc\u30eb\u306e\u30b3\u30f3\u30bd\u30fc\u30eb\u3067\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u6307\u5b9a\u3057\u305f\u30bf\u30b0\u306e\u6587\u5b57\u306b\u3064\u3044\u3066\u3001\u5358\u8272\u80cc\u666f\u306e\u5019\u88dc\u3092\u4f4e\u3044\u9806\u306b\u8868\u793a\u3059\u308b\u3002<\/p>\n\n
(() => {\nfunction measure(root) {\n function lum(c) {\n const m = \/^rgba?\\(\\s*(\\d+(?:\\.\\d+)?)[, ]+\\s*(\\d+(?:\\.\\d+)?)[, ]+\\s*(\\d+(?:\\.\\d+)?)(?:\\s*[,\/]\\s*(\\d+(?:\\.\\d+)?))?\\s*\\)$\/.exec(c);\n if (!m) return null;\n if (m[4] !== undefined) { if (Number(m[4]) !== 1) return null; }\n const v = m.slice(1, 4).map(Number).map(n => {\n n \/= 255;\n return n <= 0.04045 ? n \/ 12.92 : Math.pow((n + 0.055) \/ 1.055, 2.4);\n });\n return 0.2126 * v[0] + 0.7152 * v[1] + 0.0722 * v[2];\n }\n function background(el) {\n let e = el, color = null;\n while (e) {\n const s = getComputedStyle(e);\n if (Number(s.opacity) !== 1 || s.filter !== 'none' || s.mixBlendMode !== 'normal' || s.backgroundImage !== 'none') return null;\n if (color === null) {\n const c = s.backgroundColor;\n const transparent = c === 'transparent' || \/^rgba\\(\\s*0,\\s*0,\\s*0,\\s*0\\s*\\)$\/.test(c);\n if (!transparent) { if (lum(c) === null) return null; color = c; }\n }\n e = e.parentElement;\n }\n return color || 'rgb(255, 255, 255)';\n }\n const out = [], seen = new Set();\n for (const el of root.querySelectorAll('p,a,li,h1,h2,h3,span,button,time,small')) {\n const cs = getComputedStyle(el);\n if (!el.getClientRects().length || cs.visibility !== 'visible' || !el.textContent.trim()) continue;\n const px = parseFloat(cs.fontSize) || 16, bg = background(el);\n const key = cs.color + '|' + bg + '|' + px + '|' + cs.fontWeight;\n const l1 = lum(cs.color), l2 = bg === null ? null : lum(bg);\n const text = el.textContent.trim().slice(0, 20);\n if (l1 === null || l2 === null) { out.push({text, ok:null, ratio:null, note:'\u624b\u52d5\u78ba\u8a8d\uff1a\u900f\u660e\u5ea6\u30fb\u753b\u50cf\u30fb\u672a\u5bfe\u5fdc\u8272\u306a\u3069'}); continue; }\n if (seen.has(key)) continue;\n seen.add(key);\n const r = (Math.max(l1, l2) + 0.05) \/ (Math.min(l1, l2) + 0.05);\n const large = px >= 24 || (px >= 14 * 96 \/ 72 ? parseInt(cs.fontWeight) >= 700 : false);\n out.push({ratio:Math.round(r * 100) \/ 100, need:large ? 3 : 4.5, ok:r >= (large ? 3 : 4.5), px, w:cs.fontWeight, color:cs.color, bg, tag:el.tagName, text});\n }\n return out.sort((a, b) => (a.ratio === null ? Infinity : a.ratio) - (b.ratio === null ? Infinity : b.ratio));\n}\nconsole.table(measure(document).filter(x => x.ok !== true));\n})();<\/code><\/pre><\/div>\n\n\u6570\u5024\u3092\u8a08\u7b97\u3067\u304d\u308b\u5019\u88dc\u306f\u3001\u6587\u5b57\u8272\u30fb\u80cc\u666f\u8272\u30fb\u6587\u5b57\u30b5\u30a4\u30ba\u30fb\u592a\u3055\u304c\u540c\u3058\u7d44\u307f\u5408\u308f\u305b\u30921\u4ef6\u306b\u307e\u3068\u3081\u308b\u3002<\/p>\n\n\n\n
\u624b\u52d5\u78ba\u8a8d\u306b\u306a\u3063\u305f\u7b87\u6240\u306f\u7701\u7565\u3057\u306a\u3044\u305f\u3081\u3001\u4ef6\u6570\u3092\u30da\u30fc\u30b8\u5168\u4f53\u306e\u5408\u5426\u6570\u3068\u306f\u6271\u308f\u306a\u3044\u3002<\/p>\n\n\n
\u3053\u306e\u30b3\u30fc\u30c9\u306f\u6307\u5b9a\u30bf\u30b0\u306e\u8981\u7d20\u3092\u8abf\u3079\u308b\u88dc\u52a9\u3067\u3059\u3002\u5b50\u8981\u7d20\u3060\u3051\u8272\u304c\u9055\u3046\u6587\u5b57\u3001\u5165\u529b\u6b04\u306e\u30d7\u30ec\u30fc\u30b9\u30db\u30eb\u30c0\u30fc\u3001iframe\u3084Shadow DOM\u5185\u306e\u6587\u5b57\u306a\u3069\u3092\u7db2\u7f85\u3057\u307e\u305b\u3093\u3002\u901a\u5e38\u8868\u793a\u3067\u5019\u88dc\u304c\u306a\u304f\u3066\u3082\u3001\u30db\u30d0\u30fc\u3084\u30ad\u30fc\u30dc\u30fc\u30c9\u30d5\u30a9\u30fc\u30ab\u30b9\u6642\u306e\u6587\u5b57\u3092\u5225\u9014\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n
console.table\u306e\u884c\u3092 console.table(measure(document)) \u306b\u5909\u3048\u308b\u3068\u3001\u57fa\u6e96\u4ee5\u4e0a\u306e\u5019\u88dc\u3082\u8868\u793a\u3055\u308c\u308b\u3002<\/p>\n\n\n
\u8868\u793a\u306eratio\u306f\u5c0f\u6570\u7b2c2\u4f4d\u306b\u4e38\u3081\u3066\u3044\u307e\u3059\u304c\u3001ok\u306e\u5224\u5b9a\u306b\u306f\u4e38\u3081\u308b\u524d\u306e\u5024\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u30024.499\u5bfe1\u306f4.5\u5bfe1\u672a\u6e80\u306a\u306e\u3067\u3001\u8868\u793a\u304c4.5\u3067\u3082\u5408\u683c\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u3002\u5883\u754c\u4ed8\u8fd1\u3067\u306f\u8868\u793a\u5024\u3060\u3051\u3067\u5224\u65ad\u305b\u305a\u3001ok\u3068\u5fc5\u8981\u5024need\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n\n\n\n
![\"\u9ed2\u6587\u5b57\u3068\u767d\u80cc\u666f\u304c21\u5bfe1\u3001\u767d\u6587\u5b57\u3068\u767d\u80cc\u666f\u304c1\u5bfe1\u3001\u534a\u900f\u660e\u3068\u753b\u50cf\u3068\u89aa\u306e\u900f\u660e\u5ea6\u306f\u624b\u52d5\u78ba\u8a8d\u306b\u306a\u3063\u305f\u6e2c\u5b9a\u7d50\u679c\u3002\"](\"https:\/\/motoki-design.co.jp\/wordpress\/wp-content\/uploads\/waza-waza-design-reader-next-20261002-contrast-desktop.jpg\")