RESOLVED DUPLICATE of bug 230187 Bug 231495
On iOS 15, when the canvas font is set to -apple-system, calling fillText with Chinese characters would cause the whole canvas area to blank. 
https://bugs.webkit.org/show_bug.cgi?id=231495
Summary On iOS 15, when the canvas font is set to -apple-system, calling fillText wit...
luonan.666
Reported 2021-10-10 20:30:52 PDT
Created attachment 440751 [details] render blank demo On iOS 15, when the canvas font is set to -apple-system, calling fillText with Chinese characters would cause the whole canvas area to blank. first, set ctx.font = '28px -apple-system'; and then, draw some chinese, ctx.fillText('你好', 10, 50); then the whole canvas area becomes blank. but English letters could render correctly. Just change the font-family to 'Arial', everything works fine.
Attachments
render blank demo (511 bytes, text/html)
2021-10-10 20:30 PDT, luonan.666 		no flags
Details
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Alexey Proskuryakov
Comment 1 2021-10-11 09:20:45 PDT
I cannot reproduce this with OS 15.1 beta. I think that it was a known issue, but cannot find the bug to dupe to.
Wenson Hsieh
Comment 2 2021-10-11 09:42:08 PDT
Likely, 230187. *** This bug has been marked as a duplicate of bug 230187 ***
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