fix(playground): dispatch readystatechange + bubble DOMContentLoaded on document #10946
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Summary
Fixes #10766.
Fixes #10771.
Problem
The Playground doesn't dispatch a
readystatechange
event, and only dispatches theDOMContentLoaded
on thewindow
, not on thedocument
, so event listeners on thedocument
aren't called.Solution
readystatechange
event (once betweenDOMContentLoaded
andload
, becausedocument.readyState
will already becompleted
.)DOMContentLoaded
ondocument
and let it bubble.(Kudos to @Kaiido for the proposing this solution.)
Screenshots
Before
After
How did you test this change?
Deployed to stage and verified that it works as expected on https://developer.allizom.org/en-US/docs/web/api/document/readystatechange_event#result.