[Webkit-unassigned] [Bug 261460] New: Running WPT for WebVTT in run-webkit-tests results in a timeout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=261460

            Bug ID: 261460
           Summary: Running WPT for WebVTT in run-webkit-tests results in
                    a timeout
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kohei.ueno119 at gmail.com

As reported in https://bugs.webkit.org/show_bug.cgi?id=179370#c2, running WPT for WebVTT in run-webkit-tests results in a timeout. This is due to the caption mode of WebKitTestRunner being defaulted to `ForceOnly`, under which conditions the captions never appear. This is not a problem for LayoutTests other than WPT because we can adjust the caption mode with `window.internals.setCaptionDisplayMode('Automatic')` to ensure correct caption display during testing.

To resolve this issue, we need to make the caption mode configurable in run-webkit-tests instead of using the internal method in the window object.

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