Wikitext:

[[A|<div style="background:cyan;">aaa</div>]]

Without $wgUseTidy:

<p><a href="/index.php?title=A&amp;action=edit&amp;redlink=1" class=new title=A（页面不存在）>&lt;div style="background:cyan;"&gt;aaa&lt;/div&gt;</a>
</p>

With $wgUseTidy:

<p><a href="/index.php?title=A&amp;action=edit&amp;redlink=1" class="new" title="A（页面不存在）"></a></p>
<div style="background:cyan;">aaa</div>

However in HTML5, this is valid HTML:

<a href="A"><div style="background:cyan;">aaa</div></a>

(which is invalid in HTML4 however)

Version: 1.21.x
Severity: normal