I am using Dart 2 JS to execute Dart code in the browser.
There is an iframe element (src is of the same domain) in my HTML.
I want to use Dart to get the body of the html inside the iframe.
final iframes = document.getElementsByTagName('iframe').cast<IFrameElement>(); // Works
final iframe = iframes.first; // Works
final bodyInsideIFrame = iframe.contentWindow!.document!.body // Compile time error
This does not work. The contentWindow is WindowBase?, and not Window. This means there is not document property.
When I try to cast contentWindow to Window, I get the following error at runtime:
Evaluation failed: TypeError: Instance of '_DOMWindowCrossFrame': type '_DOMWindowCrossFrame' is not a subtype of type 'Window'
Note: I can get the Iframe's body easily with JS. So since it's possible with JS, I don't see why it would not be possible with Dart that compiles to JS (Dart 2 JS)
