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<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<box id="a" style="display: list-item;">
&c&m&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>