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HTMLScriptElement: defer プロパティ - Web API | MDN
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HTMLScriptElement: defer プロパティ
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
defer は HTMLScriptElement インターフェイスのプロパティで、スクリプトの実行方法を論理値で制御します。クラシックスクリプトの場合、defer プロパティを true に設定すると、外部スクリプトは文書が構文解析された後、DOMContentLoaded イベントを発行する前に実行されます。モジュールスクリプトの場合、defer プロパティは何の効果もありません。
これは <script> 要素の defer 属性を反映します。
値
論理値です。
例
html
<script id="el" src="/example.js" defer></script>
js
const el = document.getElementById("el");
console.log(el.defer); // 出力: true
仕様書
| Specification |
|---|
| HTML # dom-script-defer |
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