If you have html like this:
Safari can't remove the strike through. It make it:
<strike style=""><span class="Apple-style-span" style="text-decoration: none;">hello</span></strike>
Which all browsers including Safari still show as strike through.
How are you trying to remove the strikethrough? It can certainly be done with DOM manipulations.
My mistake. I should have mentioned that I am trying to remove it using execCommand strikeThrough.
This will be fixed when I fix bug 20215. I'll leave it as a separate bug until then.
I've got a partial patch locally. This is going to require some serious surgery to ApplyStyleCommand though. So this will have to wait until bug 23496 is reviewed and landed.
Fixed in http://trac.webkit.org/changeset/46286.