[Webkit-unassigned] [Bug 261283] New: oblique angle treated as binary switch

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=261283

            Bug ID: 261283
           Summary: oblique angle treated as binary switch
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nick at nicksherman.com
                CC: mmaxfield at apple.com

Created attachment 467589

  --> https://bugs.webkit.org/attachment.cgi?id=467589&action=review

Oblique angle test shown in Safari 16.6 on the left and Firefox 117.0 on the right

Using the `oblique` value with a specific angle for the `font-style` property does not work as expected when the font style is synthesized. Instead of slanting the font according to the specified angle, the value behaves more like a binary toggle: For anything under 14 degrees, no slanting is applied. For anything over 14 degress, the default of 14 degrees is applied (even if the specified angle is much higher).

Here is a test page on CodePen:
https://codepen.io/NickSherman/pen/oNJBeRv

See comparison of Safari 16.6 vs Firefox 117.0 attached.

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