[Webkit-unassigned] [Bug 240601] New: AX: Captions not displayed in Safari video player when MacOS setting is checked

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240601

            Bug ID: 240601
           Summary: AX: Captions not displayed in Safari video player when
                    MacOS setting is checked
           Product: WebKit
           Version: Safari 15
          Hardware: All
                OS: All
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: shawnpaul_butler at apple.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

In the past the native video player in Safari in MacOS and iOS would automatically display captions when this setting was checked: "System Preferences > Accessibility > Prefer closed captions and SDH". Unfortunately this is no longer working.

This issue is impacting video accessibility across Apple.com (including Support and OnlineStore)

Here are a few example HLS video examples:
 - https://www.apple.com/105/media/us/iphone-13-pro/2021/404b23a8-f9c5-466c-b0e6-3d36705b959d/films/product/iphone-13-pro-product-tpl-us-2021_16x9.m3u8
 - https://www.apple.com/105/media/us/mac-studio/2022/eb784018-d0ea-4669-b844-fed626ab0367/films/product/mac-studio-product-tpl-us-2022_16x9.m3u8
 - https://www.apple.com/105/media/us/ipad-air/2022/5abf2ff6-ee5b-4a99-849c-a127722124cc/films/product/ipad-air-product-tpl-us-2022_16x9.m3u8

Steps to recreate:
 - Create a new Mac User (System Pref > User and Groups > +)
 - Log in as new user, when asked turn on Accessibility > Hearing > Captions
 - Open Safari browser
 - Open a video in the Safari browser
 - click play
 - see captions are available, but not enabled
 - In the video player select (>> Subtitles > Auto)
 - Reload the video and play
 - see captions are available, but still not enabled

I have been able to reproduce this on 
 - MacOS 12.4 with Safari 15.5
 - MacOS 12.3 with Safari 15.5
 - MacOS 11.7 with Safari 15.3
 - MacOS 11.5 with Safari
 - iOS 15.4.1

Please let me know if you have any questions or need more details. Thanks!!!

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