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DOMTokenList: supports() メソッド - Web API | MDN
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DOMTokenList: supports() メソッド
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2018年4月.
supports() は DOMTokenList インターフェイスのメソッドで、渡されたトークンが関連する属性で対応しているトークンに含まれていれば true を返します。このメソッドは機能に対応しているかを検出するためのものです。
構文
js
supports(token)
引数
token-
問い合わせるトークンが入った文字列です。
返値
論理値で、トークンが見つかったかどうかを返します。
例
js
const iframe = document.getElementById("display");
if (iframe.sandbox.supports("an-upcoming-feature")) {
// support code for mystery future feature
} else {
// fallback code
}
if (iframe.sandbox.supports("allow-scripts")) {
// instruct frame to run JavaScript
//
// (NOTE: This feature is well-supported; this is just an example!)
//
}
仕様書
| Specification |
|---|
| DOM # ref-for-dom-domtokenlist-supports① |
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