[Webkit-unassigned] [Bug 168491] New: AX: "(inverted-colors)" match sometimes fails on change

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=168491

            Bug ID: 168491
           Summary: AX: "(inverted-colors)" match sometimes fails on
                    change
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jcraig at apple.com
                CC: webkit-bug-importer at group.apple.com

The (inverted-colors) media feature from bug 163564 appears to match most of the time, for example, when toggling the setting on macOS or iOS if Safari is in the foreground. Or when using the Accessibility Inspector to change the setting.

Some times when it does not match:
- if you exit Safari on iOS and change via the settings app, the match does not fire when the app is returned to the foreground.
- if you lock the device or otherwise background Safari, the match does not fire again in Safari until you either 1) reload the page, or 2) rotate the device to trigger another orientation match change.

Once you reload the page, the subsequent changes fire appropriate matches. It seems like WebKit is trying to be efficient and not listen for match notifications if it thinks nothing should have changed. If you change the device orientation while it's in this state it seems to work as expected until the app is backgrounded again.

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