[Webkit-unassigned] [Bug 207754] New: WebKit 606+ does not render KaTeX fraction lines

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207754

            Bug ID: 207754
           Summary: WebKit 606+ does not render KaTeX fraction lines
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: axel at dua3.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 390749

  --> https://bugs.webkit.org/attachment.cgi?id=390749&action=review

minimal HTML file exposing the rendering issue

When KaTeX is used with a webkit version >= 606, fraction lines do not render correctly.

This is independent of the operating system used. On the KaTeX side, this is tracked under https://github.com/KaTeX/KaTeX/issues/1775. After spending much time investigating, the bug seems to be on the webkit side. I myself have tried different versions of the JavaFX WebView component on Windows, MacOS and Linux, which are all based on a WebKit version of 606 or newer, and none renders fraction lines correctly. Linux users of WebKitGTK+ have also reported this bug.

Since Safari renders correctly, I checked Safari's WebKit version and asked a WebKitGTK+ user to test with that specific version and got this reply:
~~~
I use WebKitGTK+ in Ubuntu. Version WebKit engine is 605.1.15 (Mozilla/5.0 (X11; Ubuntu; Linux x86_64) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0 Safari/605.1.15). The engine the \frac-line displays correct.
~~~

So this seems really to be a regression from WebKit 605.x to 606+.

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