createEvent("textevent") creates a TextEvent

[zcorpan]

See w3c/uievents#362

• At least two implementers are interested (and none opposed):
  • Already implemented in Chromium and WebKit
  • Gecko is currently implementing.
• Tests are written and can be reviewed and commented upon at:
  • DOM: document.createEvent('textevent') maps to TextEvent web-platform-tests/wpt#44467
• Implementation bugs are filed:
  • Chromium: N/A
  • Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=903746
  • WebKit: N/A
  • Deno (only for aborting and events): N/A
  • Node.js (only for aborting and events): N/A
• MDN issue is filed: Not necessary, see https://developer.mozilla.org/en-US/docs/Web/API/Document/createEvent
• The top of this comment includes a clear commit message to use.

(See WHATWG Working Mode: Changes for more details.)

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Preview | Diff

[zcorpan]

I think w3c/uievents#362 needs to land first to make this build without errors.

[annevk]

Can you write a paragraph or so about the context? The UI Events issue is very light on details.

[zcorpan]

The textInput event is required for web compat when typing, pasting, dropping, and maybe some other actions, in an editable field (input or textarea or contenteditable). The event uses the TextEvent interface in Chromium and WebKit. Supporting that interface and the change in this PR is also required for web compat because some sites use it for feature-checking support for the textInput event. Example: https://github.com/cespare/pastedown/blob/9211a49c848d037b01fd42c26891f4b83a19a56d/public/pastedown.js#L51

[zcorpan]

https://docs.google.com/document/d/1VJRiwjhx-_aEudGocKKoR_qwxLYxpt_YXK1N0evxrcc/edit#heading=h.rkm12k5p36bg has more context on the web compat impact for Gecko.

[zcorpan]

I think w3c/uievents#362 needs to land first to make this build without errors.

That has now landed and the build check for this PR is now green.