Not working in sidePanel webextension

[JVariance]

I'm working on a webextension and tried documentPictureInPicture.requestWindow() from within a sidePanel. Unfortunately it doesn't work from there (onenter and window attributes are both null).

[beaufortfrancois]

@steimelchrome Is this expected that the API doesn't work from extension pages?

[steimelchrome]

Yes we don't currently allow the API to work from extension pages in Chrome. I don't know that it's technically infeasible to eventually support but since IIUC those are not attached to a WebContents then most of the code just doesn't work as is

[hanguokai]

For extension pages, my test results are:

• it works if the extension page is opened in a browser tab (like a normal web page).
• it doesn't work for extension popup page, side panel page and offscreen document. The pip window closes immediately after calling requestWindow()