Element QSA Scope

Element QSA Scope lets you select elements relative to the current node. It is a polyfill for :scope support within the selector methods Element#querySelector, Element#querySelectorAll, Element#matches, and Element#closest.

npm install element-qsa-scope

The entire script is 341 bytes when minified and gzipped.

How it works

By default, selector methods return elements matching CSS selectors absolutely from the document, similar to an element being matched with Element#matches. Imagine the following document:

<ul>
  <li><a>Link</a>
    <ul>
      <li><a>Sublink</a></li>
    </ul>
  </li>
</ul>
<script>li = document.querySelector('li')</script> 

Without :scope, the following selector will return the first link.

li.querySelector('li a'); // returns <a>Link</a>

This is an example of how scoping is useful when traversing the DOM.

li.querySelector(':scope li a'); // returns <a>Sublink</a>

Browser compatibility

Browser	Native Support	Polyfill Support
Android	4.4+	2.2 - 4.2
Blackberry	✘	7+
Chrome	27+	4 - 26
Edge	✘	12+
Firefox	32+	3.5 - 31
Internet Explorer	✘	8 - 11
Opera	15+	10 - 14
Opera Mini	✘	5+
Safari (iOS)	7+	3.2 - 6
Safari (MacOS)	6.2+	4 - 6

Test Results

Additional tests were run against the latest 3 versions of browsers, including common outliers such as Internet Explorer 8+ and Safari 6+.

Native Support · Polyfilled Support