[Webkit-unassigned] [Bug 159617] New: font-size measured in ex or ch scales quadratically with page zoom

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159617

            Bug ID: 159617
           Summary: font-size measured in ex or ch scales quadratically
                    with page zoom
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: peter.krautzberger at mathjax.org
                CC: simon.fraser at apple.com

WebKit's behavior seems identical to https://bugs.chromium.org/p/chromium/issues/detail?id=408777. 

Copied from there:

> Example URL:
> http://web.mit.edu/andersk/Public/font-size-css-units.html
> 
> Steps to reproduce the problem:
> 1. Visit http://web.mit.edu/andersk/Public/font-size-css-units.html
> 2. At 100% page zoom, observe that all the lines are roughly the same size.
> 3. Zoom in.
> 
> What is the expected behavior?
> All lines should get bigger by the same ratio.
> 
> What went wrong?
> The lines where font-size is measured in ex or ch get bigger much faster than the other lines.  At 500% page zoom, they are shown at 25 times their original size.
> 
> Does it occur on multiple sites: Yes
> 
> Does this work in other browsers? Yes

While Blink is also affected, Firefox and IE/Edge are not.

Thanks in advance for looking into it!

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