[WebAPI] IndexedDB, Fx 77 tasks

[Elchi3]

Trello

https://trello.com/c/StA65qFA/113-indexeddb-api

Acceptance criteria

1. • Implement IDBCursor request attribute

[Elchi3]

@chrisdavidmills I didn't see this one filed in any issue for Firefox 77 yet.
Do you want to take this one on or who would be good for IndexedDB?

[chrisdavidmills]

Sure, I can take that one. Looks like it got missed because I forgot to set it as part of the Firefox 77 epic. I'll do that now

[chrisdavidmills]

I've updated the necessary docs pages:

• https://developer.mozilla.org/en-US/docs/Web/API/IDBCursor
• https://developer.mozilla.org/en-US/docs/Web/API/IDBCursor/request

(Well, fixed them up slightly; looks like @sideshowbarker did most of this already ;-) )

I've not added a release note yet, or updated the BCD, because I can't seem to get the feature to work in Firefox 77. I've asked the engineer about it.

[chrisdavidmills]

Ah, looks like I didn't have my Nightly updated properly ;-)

Rel note added: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/77#APIs

[chrisdavidmills]

browser-compat-data update submitted: mdn/browser-compat-data#6177