Firefox Changing Source Code on H Tags within DT Tags
While other browsers let you get away with it Firefox won't.
Following HTML markup for a plain old definition list:
<dl>
<dt>
<h3>Some Title</h3>
</dt>
<dd>
</dd>
</dl>
BUT Firefox turns your above code into:
<dl><dt>
</dt>
<h3>Some Title</h3>
<dd>
</dd>
</dl>
Which can potentially screw up your design for this definition list depending on css used.
W3 Validator gives an error: document type does not allow element "h3" here; missing one of "object", "applet", "map", "iframe", "button", "ins", "del" start-tag The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element. One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").
Turning the dt into dd tags would be perfectly valid and left untouched by Firefox:
<dl><dd>
<h3>Some Title</h3>
</dd>
<dd>
</dd>
</dl> I don't know how crawlers/SEO react on missing dt tags within dl tags. I guess the safest way would be to find an alternate way to the above approach.
Rearranging the source code is not really something I would expect Firefox to do.
