[Webkit-unassigned] [Bug 165004] New: The event order of keydown/keyup events and composition events are wrong on macOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165004

            Bug ID: 165004
           Summary: The event order of keydown/keyup events and
                    composition events are wrong on macOS
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
               URL: https://dvcs.w3.org/hg/d4e/raw-file/tip/key-event-test
                    .html
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Event Handling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: masayuki at d-toybox.com

I tested this on:

* Safari Technology Preview Release 18 (Safari 10.1, WebKit 12603.1.12)
* Safari Version 10.0.1 (12602.2.14.0.7)

STR:

1. Load https://dvcs.w3.org/hg/d4e/raw-file/tip/key-event-test.html
2. Change active keyboard layout to "Hiragana" of Japanese IME
3. Type "a" key of ANSI keyboard layout mapping

Expected Result:

event order should be:

1. keydown
2. compositionstart
3. compositionupdate
4. input
5. keyup

Actual Result:

1. compositionstart
2. compositionupdate
3. input
4. keydown
5. keyup

This is really different from the spec:
https://w3c.github.io/uievents/#events-composition-key-events

Google Chrome works as expected. Firefox doesn't fire keyup event since it's traditional behavior <https://bugzil.la/354358> but the order is correct.

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