Chrome Version 66.0.3359.139 (Official Build) (64-bit)
MacOS High Sierra version 10.13.4 (17E202)
Vector skin
When I navigate to https://en.wikipedia.org/wiki/Special:EditWatchlist, I get what looks like a correct TOC {F18167625}, but the links don't work. The anchor tags are generated in the TOC, but the matching anchors (#editwatchlist-ns0, etc) don't exist on the page.
TOC HTML:
```lang=html
<div id="toc" class="toc"><div class="toctitle" lang="en" dir="ltr"><h2>Contents</h2><span class="toctoggle"> [<a role="button" tabindex="0" class="togglelink">hide</a>] </span></div>
<ul>
<li class="toclevel-1"><a href="#editwatchlist-ns0"><span class="tocnumber">1</span> <span class="toctext">(Article)</span></a></li>
<li class="toclevel-1"><a href="#editwatchlist-ns2"><span class="tocnumber">2</span> <span class="toctext">User</span></a></li>
<li class="toclevel-1"><a href="#editwatchlist-ns4"><span class="tocnumber">3</span> <span class="toctext">Wikipedia</span></a></li>
<li class="toclevel-1"><a href="#editwatchlist-ns10"><span class="tocnumber">4</span> <span class="toctext">Template</span></a></li>
<li class="toclevel-1"><a href="#editwatchlist-ns118"><span class="tocnumber">5</span> <span class="toctext">Draft</span></a></li>
</ul>
</div>
```
Header HTML (no `id` anywhere):
```lang=html
<legend class="oo-ui-fieldsetLayout-header">
<span class="oo-ui-iconElement-icon"></span>
<span class="oo-ui-labelElement-label">(Main)</span>
</legend>
```