<nav class="toc">
<input id="ac-toc" name="accordion-toc" type="checkbox" />
<label for="ac-toc">Overview</label>
<div class="toc__menu" markdown="1">
*  Auto generated table of contents
{:toc}
</div>
</nav>

<nav class="toc">
<input id="ac-toc" name="accordion-toc" type="checkbox" />
<label for="ac-toc" onclick="ga('send', 'event', 'toc', 'click', '{{ page.url | slugify }}');">Overview</label>
<div class="toc__menu" markdown="1">
*  Auto generated table of contents
{:toc}
</div>
</nav>

Add Google Analytics event tracking to measure TOC toggle button clicks
Add Google Analytics event tracking to measure TOC toggle button clicks
