Html5 del tag support

Hi,
I am very disappointed by the way that Mozilla Firefox support <del> tag.
Please, try to display the code below with Firefox then Safari : you will get why I mention that Firefox has a wrong <del> tag support :
<pre><nowiki><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style>
h1 {
font: 3.4em/4 "Helvetica Neue";
font-weight: 100;
font-style: italic;
</style>
</head>
<body>
<h1>My <del>ex</del>Title</h1>
</body>
</html></nowiki></pre>

I can only compare Firefox and Chrome. Seems that both place the line through the center of a lower case x (half of the x-height) when the font size is a bit larger but where they vary, Chrome aims higher and Firefox aims lower.
Test page: http://jsfiddle.net/3futZ/
Not sure there is any applicable standard for exactly where a line-through is drawn.
''Note: You can change the font-family in the Fiddle and save as a new version if you like.''

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