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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - font-size measured in ex or ch scales quadratically with page zoom"
href="https://bugs.webkit.org/show_bug.cgi?id=159617">159617</a>
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<th>Summary</th>
<td>font-size measured in ex or ch scales quadratically with page zoom
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<th>Classification</th>
<td>Unclassified
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<th>Product</th>
<td>WebKit
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<th>Version</th>
<td>Safari 9
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<th>Hardware</th>
<td>Unspecified
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<th>OS</th>
<td>Unspecified
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>Normal
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>Layout and Rendering
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>peter.krautzberger@mathjax.org
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<th>CC</th>
<td>simon.fraser@apple.com
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<pre>WebKit's behavior seems identical to <a href="https://bugs.chromium.org/p/chromium/issues/detail?id=408777">https://bugs.chromium.org/p/chromium/issues/detail?id=408777</a>.
Copied from there:
<span class="quote">> Example URL:
> <a href="http://web.mit.edu/andersk/Public/font-size-css-units.html">http://web.mit.edu/andersk/Public/font-size-css-units.html</a>
>
> Steps to reproduce the problem:
> 1. Visit <a href="http://web.mit.edu/andersk/Public/font-size-css-units.html">http://web.mit.edu/andersk/Public/font-size-css-units.html</a>
> 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</span >
While Blink is also affected, Firefox and IE/Edge are not.
Thanks in advance for looking into it!</pre>
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