Links inside headings generate all kinds of suboptimal renderings.

For example:

<h1><a href="http://example.org">Test</a></h1>
<h1>Longer: <a href="http://example.org">Test</a></h1>

renders both headings on the same line without any space.

<h1>Longer: <a href="http://example.org">Test for the link text in here</a></h1>

breaks to a new line before the anchor tag whereas browser choose to break on a word boundary within the anchor.