This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The contentDocument read-only property of the HTMLObjectElement interface Returns a Document representing the active document of the object element's nested browsing context, if any; otherwise null.
A Document.
| Specification |
|---|
| HTML> # dom-object-contentdocument> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
contentDocument |
1 | 12 | 1 | ≤12.1 | 3 | 18 | 4 | ≤12.1 | 1 | 1.0 | 4.4 | 1 |
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLObjectElement/contentDocument