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HighlightRegistry: size プロパティ - Web API | MDN
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HighlightRegistry: size プロパティ
Baseline
2025
Newly available
Since June 2025, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
size プロパティは、 HighlightRegistry の中にある Highlight オブジェクトの数を返します。
値
レジストリーにある Highlight オブジェクトの数を示す読み取り専用の整数。
例
size の使用
js
const highlight1 = new Highlight();
const highlight2 = new Highlight();
CSS.highlights.set("highlight-1", highlight1);
CSS.highlights.set("highlight-2", highlight2);
console.log(CSS.highlights.size); // 2
仕様書
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-get-map.prototype.size |
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