[Popup] Polyfil / Open UI component

[melanierichards]

On MSEdgeExplainers #461, @newtack asked:

I love the idea of having a native popup and would love to start programming against the API now with a polyfill, which I could remove later on.

Would this be possible?

Certainly possible, and a great thing for us to take up in Open UI! Transferring the issue here so we can make this part of the Open UI component library.

[melanierichards]

I know @samthor was interested in contributing towards a polyfil. Unfortunately we (Edge folks) were/are still working out some kinks in our anchored positioning proposal, and that was a blocker to complete a polyfil story. Working on getting that published ASAP though!

[github-actions]

There hasn't been any discussion on this issue for a while, so we're marking it as stale. If you choose to kick off the discussion again, we'll remove the 'stale' label.

[mfreed7]

Still would be great to have someone write a polyfill for the Popup API. Any takers? I'm willing to assist with any questions about the API or the Chromium implementation.

[mfreed7]

We have someone working on polyfills now, so I'm going to close this. More details later.

[nuxodin]

I would like to have a look at the polyfill, is the code to be found somewhere?