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Description
Right now this logs a CSSStyleSheet object and then null in every browser:
<!doctype html>
<style>div { color: green }</style>
<script>
let s = document.querySelector('style');
console.log(s.sheet); // [CSSStyleSheet]
s.remove();
console.log(s.sheet); // null
</script>This should be in the spec. Similarly when rel attribute changes and such. Also when the element becomes disconnected, per the discussion in w3c/csswg-drafts#3096.