vendor/bundle/ruby/2.4.0/gems/kramdown-1.14.0/test/testcases/block/04_header/atx_header.html

<h1>This is a header</h1>

<h2>This is a header</h2>

<h3>This is a header</h3>

<h4>This is a header</h4>

<h5>This is a header</h5>

<h6>This is a header</h6>

<h1>Header</h1>
<h1>Header</h1>

<h2>Header</h2>
<blockquote>
  <p>blockquote</p>
</blockquote>

<h6>header</h6>
<p>paragraph</p>

<blockquote>
  <p>blockquote
### not a header</p>
</blockquote>

<h1>header #</h1>

<h1>header</h1>

<p>#</p>

<p>#</p>

<h3 id="id">Header</h3>

<h3 id="Id">Header</h3>

<h3 id="id">Header</h3>

<h3 id="A-Za-z0-9_:t">Header</h3>

<h3>Header {#9ab}</h3>

<h3>Header{#noid}</h3>

<h3>Header ##{#noid}</h3>

<h3>Last</h3>