That minimap is wild, it duplicates the entire post but every word is surrounded by a span. I thought maybe it was like a bitmap or something but no:
<p><span class="censored">SSA</span> <span class="censored">is</span> <span class="censored">hugely</span> <span class="censored">popular,</span> <span class="censored">to</span> <span class="censored">the</span> <span class="censored">point</span> <span class="censored">that</span> <span class="censored">most</span> <span class="censored">compiler</span> <span class="censored">projects</span> <span class="censored">no</span> <span class="censored">longer</span> <span class="censored">bother</span> <span class="censored">with</span> <span class="censored">other</span> <span class="censored">IRs</span> <span class="censored">for</span> <span class="censored">optimization</span><sup id="fnref:ghc" role="doc-noteref"><a href="#fn:ghc" class="footnote" rel="footnote"><span class="censored">7</span></a></sup><span class="censored">.</span></p>