[Webkit-unassigned] [Bug 202138] New: Optical sizing not applied to 'opsz' axis of optical sizing WPT variable test font

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=202138

            Bug ID: 202138
           Summary: Optical sizing not applied to 'opsz' axis of optical
                    sizing WPT variable test font
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d-r at roettsches.de
                CC: mmaxfield at apple.com

For 
https://wpt.fyi/results/css/css-fonts/variations/variable-opsz.html?label=experimental&label=master&aligned
and the contained test font variabletest_box.ttf [1], WebKit nightly does not apply the correct opsz value to the variation axis. The font does not contain a STAT table, which according to discussions with Myles is the reason CoreText does not apply the opsz value. The test passes in FireFox and Chromium Canary.

In https://bugs.webkit.org/show_bug.cgi?id=197528#c4 Myles mentioned creating a test font to test optical sizing would be useful. In this sense, this WPT test font provides the desired testing and may be helpful to test opsz in WebKit in general.

[1] http://web-platform-tests.live/css/css-fonts/variations/resources/variabletest_box.ttf

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