[Webkit-unassigned] [Bug 80360] New: 1ex should equal .5em when the font has no x-height metric

Mon Mar 5 17:24:42 PST 2012

https://bugs.webkit.org/show_bug.cgi?id=80360

           Summary: 1ex should equal .5em when the font has no x-height
                    metric
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: tabatkins at google.com

Testcase
========

<!doctype html>
<svg xmlns = 'http://www.w3.org/2000/svg' style='display:none'>
  <defs>
    <font id="Font1">
      <font-face font-family="block" />
    </font>
  </defs>
</svg>
<style>
.em { height: .5em; width: .5em; }
.ex { height: 1ex; width: 1ex; }
.cover { background: green; }
.back { background: red; }
.one { left: 10px; }
.two { left: 70px; }
#test > div { font-family: block; font-size: 100px; position: absolute; top: 10px; }
</style>
<div id='test'>
  <div class='back em one'></div>
  <div class='cover ex one'></div>

  <div class='back ex two'></div>
  <div class='cover em two'></div>
</div>

Expected result
===============
Because the SVG font doesn't define an x-height metric, the 'ex' unit for elements that use it should be sized to half the 'em' unit.

Actual result
=============
The 'ex' unit is sized to 0.  This also occurs with TrueType fonts that have been modified to not have an x-height metric.

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