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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - WebKit doesn't re-resolve em-valued properties to account for font-size transitions"
   href="https://bugs.webkit.org/show_bug.cgi?id=241570">241570</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>WebKit doesn't re-resolve em-valued properties to account for font-size transitions
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>Safari 15
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Animations
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned@lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>dholbert@mozilla.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dino@apple.com, graouts@apple.com, heycam@apple.com
          </td>
        </tr></table>
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        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=460214" name="attach_460214" title="testcase 1">attachment 460214</a> <a href="attachment.cgi?id=460214&action=edit" title="testcase 1">[details]</a></span>
testcase 1

STR:
1. Load attached testcase.
2. Hover the orange area.

ACTUAL RESULTS:
The orange area's width suddenly jumps to twice its original width.

EXPECTED RESULTS:
The orange area's width should grow gradually (in response to the font-size transition).


NOTES:
The element here has a width specified in `em` units, and hovering triggers a change to `font-size` which triggers a CSS transition.  That should add a value for `font-size` to the cascade, per <a href="https://www.w3.org/TR/css-transitions-1/#application">https://www.w3.org/TR/css-transitions-1/#application</a> , which should in turn influence the resolution of `em`-valued properties.

Safari 15.5 gives ACTUAL RESULTS.
Firefox and Chrome give EXPECTED RESULTS.</pre>
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