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<html>
<style>
div {
  color: red;
}

div::selection {
  background-color: lime;
}
</style>

<div id="foo">Hello world</div>

<script>
document.write('<p>The number of matched rules is: ' + 
document.defaultView.getMatchedCSSRules(document.getElementById('foo'), '').length);
</script>