Run results for: TreeWalker vs querySelectorAll

Run details:
User agent: Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36
Browser: Chrome 84
Operating system: Fedora
Device Platform: Desktop
Date tested: 4 years ago
Test name	Executions per second
TreeWalker	199397.9 Ops/sec
querySelectorAll	264816.8 Ops/sec
HTML Preparation code:
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  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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</article>
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<article>
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</article>
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<article>
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  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
  <!-- article in end -->
</article>
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<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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</article>
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<!-- article out start -->
<article>
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  <h1 data-is-title="true">Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cumque, nostrum.</p>
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Tests:
TreeWalker
const treeWalker = document.createTreeWalker( document.body, NodeFilter.SHOW_ELEMENT ); const titles = []; let title; while (title = treeWalker.nextNode()) { if (title.hasAttribute('data-is-title')) { titles.push(title.textContent); } }
querySelectorAll
const titles = []; const elements = document .body .querySelectorAll('[data-is-title]'); for (let i = 0, title; (title = elements[i]); i += 1) { titles.push(title.textContent); }