[Webkit-unassigned] [Bug 227353] New: Font optical sizing is broken when set to default value

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=227353

            Bug ID: 227353
           Summary: Font optical sizing is broken when set to default
                    value
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: herr.ernst at gmail.com

Created attachment 432167

  --> https://bugs.webkit.org/attachment.cgi?id=432167&action=review

test case

When setting the `opsz` axis in a variable font to the default value, it gets sized incorrectly.

Attached is an example where Source Sans (with its default opsz value of 20) is used as a variable font, and for testing purposes the optical size is set to increasing values. Notice the wrong jump when set to 20, which is the default (nearby values like 19.999 and 20.001 work correctly). Firefox and Chrome work correctly.

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