[Webkit-unassigned] [Bug 179237] New: Automatic linebreaking of WebVTT subtitles is not supported

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=179237

            Bug ID: 179237
           Summary: Automatic linebreaking of WebVTT subtitles is not
                    supported
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
               URL: https://w3c.github.io/webvtt/#introduction-multiple-li
                    nes
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr

>From the spec: https://w3c.github.io/webvtt/#introduction-multiple-lines

"Line breaks in cues are honored. User agents will also insert extra line breaks if necessary to fit the cue in the cue’s width. In general, therefore, authors are encouraged to write cues all on one line except when a line break is definitely necessary."

This page uses the example from the specification:

https://people.igalia.com/fwang/webvtt-tests/subtitle-linebreaking.html

Linebreaking happens for the long (third) subtitle in Gecko, but not in WebKit. I tried both WebKitGTK+/Linux and Safari/macOS.

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