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Mercurial (d8847129d134)

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<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

<box id="a" style="display: list-item;">
&amp;c&amp;m&amp;q
<box id="b"/>
</box>

<style xmlns="http://www.w3.org/1999/xhtml">
#a::first-letter {float: right; color: red;}
</style>

<script xmlns="http://www.w3.org/1999/xhtml"><![CDATA[
function run() {
  for (var i = 0; i < 20; i++) {
    document.documentElement.offsetWidth;
    doe();
    document.documentElement.offsetWidth;
    undoe();
  }
}
function doe() {
  document.getElementById('a').style.direction = 'rtl';
  document.getElementById('b').style.direction = 'ltr';
}
function undoe() {
  document.getElementById('a').style.direction = 'ltr';
  document.getElementById('b').style.direction = 'rtl';
}
setTimeout(run, 100);
]]></script>
</window>