The HTML API escapes `<style>` tag contents to ensure the correct HTML structure. Common HTML escaping is unsuitable for `<style>` tags because they contain "raw text." The additional safety allows other restrictions, such as rejecting content with `<>`, to be relaxed or removed because the resulting tag will be well-formed.
Developed in https://github.com/WordPress/wordpress-develop/pull/10656.
Props jonsurrell, westonruter, dmsnell, ramonopoly, soyebsalar01, drw158, sabernhardt.
See #64418.
Built from https://develop.svn.wordpress.org/trunk@61418
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