[Webkit-unassigned] [Bug 200131] New: AX: VoiceOver speech gets stuck "buzzing" on ^* while reading all

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=200131

            Bug ID: 200131
           Summary: AX: VoiceOver speech gets stuck "buzzing" on
                    <sup>*</sup> while reading all
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: me at westonthayer.com
                CC: webkit-bug-importer at group.apple.com

When VoiceOver on macOS is reading the page (via VO+A), if it encounters <sup>*</sup>, it's speech synthesizer will emit a buzzing sound that will not stop until VoiceOver is turned off.

STEPS TO REPRODUCE

1. Open https://jsbin.com/mujukeqawe/edit?html,css,output in Safari on macOS
2. Turn VoiceOver on
3. Place focus on the button in the output pane
4. Use VO+A to start reading from there

ACTUAL: After reading the <button>'s contents, VoiceOver starts emitting a non-stop buzzing sound. The only way to get it to stop is to turn VoiceOver off.
EXPECTED: VoiceOver should read "Warning, this will buzz star"


HARDWARE

OS: macOS 10.14.6
Browser: Safari 12.1.2

ADDITIONAL BUILDS & PLATFORMS

Does not occur on iOS 12.3.1 Safari or with macOS Chrome 75.0.3770.142 (Official Build) (64-bit)

ADDITIONAL INFORMATION

- Changing <sup> to <span> fixes the issue
- This only happens when reading the document with VO+A. If I move the cursor to it manually, it reads correctly
- <kbd>, <sub>, and <samp> also cause the issue

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