🐛 form submission invalid in playground

[hanyujie2002]

MDN URL

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/dialog#handling_the_return_value_from_the_dialog

What specific section or headline is this issue about?

#handling_the_return_value_from_the_dialog

What information was incorrect, unhelpful, or incomplete?

When the example EmbedLiveSample("Handling the return value from the dialog") be played in playground, the cancel button is invalid.

However, the button is valid when the example is directly played in mdn

What did you expect to see?

The cancel button is valid when playing the example in playground

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

No response

[hanyujie2002]

Finally I get the point. The browser console warns me "Blocked form submission to '' because the form's frame is sandboxed and the 'allow-forms' permission is not set."

Due to the sandbox property of <iframe> only include allow-scripts and allow-same-origin in the playground and don't have allow-forms, the form action is forbidden.

Is there any way to add allow-forms to the <iframe>?

Slightly ping @yin1999

[hanyujie2002]

Or due to security concern it's intentionally done in like this way?

[hanyujie2002]

Maybe its better to move this issue to yari 🤔

[yin1999]

/cc @bsmth Could you transfer this :)

[bsmth]

/cc @bsmth Could you transfer this :)

Sure thing, let's see what eng has to say