[Webkit-unassigned] [Bug 220140] New: iOS 14.3 Safari on iPhone has an incorrect font size with vertical-rl

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220140

            Bug ID: 220140
           Summary: iOS 14.3 Safari on iPhone has an incorrect font size
                    with vertical-rl
           Product: WebKit
           Version: Safari 14
          Hardware: iPhone / iPad
                OS: iOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: myh at outlook.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 416746

  --> https://bugs.webkit.org/attachment.cgi?id=416746&action=review

Different Font Sizes with vertical-rl

Please open this link on iPhone (maybe 8 Plus) iOS 14.3 Safari:
https://mrmyhuang.github.io/catalog/juan/T0235/1
It displays some texts with CSS "writing-mode: vertical-rl."

You will see the texts are rendered with 32px (correct font size) or 41px (incorrect).
The attached screenshot shows the correct font size in the green rectangle and the incorrect font size in the red rectangle.
However, iPad 7 iOS 14.3 Safari has no such problem! Try to open the link!

Please fix this bug on iPhone. Thanks.

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