Introduction

SentinelJS is a tiny JavaScript library that makes it easy to set up a watch function that will notify you anytime a new node is added to the DOM that matches a given CSS rule. Among other things, you can take advantage of this to implement custom-elements and make other in-place modifications to new DOM elements:

<script>
  sentinel.on('custom-element', function(el) {
    // A new <custom-element> has been detected
    el.innerHTML = 'The sentinel is always watching.';
  });
</script>
<custom-element></custom-element>

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