RESOLVED MOVED 202138
Optical sizing not applied to 'opsz' axis of optical sizing WPT variable test font 
https://bugs.webkit.org/show_bug.cgi?id=202138
Summary Optical sizing not applied to 'opsz' axis of optical sizing WPT variable test...
Dominik Röttsches (drott)
Reported 2019-09-24 00:23:39 PDT
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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Myles C. Maxfield
Comment 1 2019-09-24 04:59:54 PDT
This is due to CoreText not handling STAT-less variable fonts correctly. <rdar://problem/55385856>
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