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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/API/HTMLIFrameElement/allowFullscreen below:

HTMLIFrameElement：allowFullscreen 属性 - Web API

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HTMLIFrameElement 接口的 allowFullscreen 属性是一个反映了 <iframe> 元素的 allowfullscreen 属性的布尔值，它表示 iframe 的内容是否允许使用 requestFullscreen()。

备注： 此属性被视为遗留属性。请改用 allow="fullscreen" 和 HTMLIFrameElement.allow。

一个布尔值。

<iframe id="el" allowfullscreen></iframe>

const el = document.getElementById("el");
console.log(el.allowFullscreen); // 输出：true

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