This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
The type property of the HTMLEmbedElement interface returns a string that reflects the type attribute of the <embed> element, indicating the MIME type of the resource. It reflects the <embed> element's type attribute
A string; the MIME type of the resource.
const el = document.getElementById("el");
console.log(el.type); // Output: "video/webp"
| Specification |
|---|
| HTML> # dom-embed-type> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
type |
1 | 79 | 1 | ≤12.1 | 3 | 18 | 4 | ≤12.1 | 1 | 1.0 | 4.4 | 1 |
HTMLObjectElement.typeHTMLSourceElement.type
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLEmbedElement/type