metalsmith-headings-identifier/spec/fixture/expected/scopedNonDuplicateIds.html

A Metalsmith plugin to add an id + anchor to all headings on a page

<h1 id="title-a"><a class="heading-anchor" href="#title-a"><span></span></a>title A</h1>
<h2 id="subtitle"><a class="heading-anchor" href="#subtitle"><span></span></a>subtitle</h2>
<h1 id="title-b"><a class="heading-anchor" href="#title-b"><span></span></a>title B</h1>
<h2 id="subtitle-1"><a class="heading-anchor" href="#subtitle-1"><span></span></a>subtitle</h2>
<h2 id="subtitle-1-1"><a class="heading-anchor" href="#subtitle-1-1"><span></span></a>subtitle-1</h2>
<h2 id="subtitle-1-2"><a class="heading-anchor" href="#subtitle-1-2"><span></span></a>subtitle-1</h2>