Syntax highlighting broken in style tags

Test case:
<style type="text/css"> <?php echo $ok; ?> </style>

Broken highlighting:

Related: #54

I stumbled across a related issue:
Using HTML comments (<!--) inside the style tag breaks code highlighting for the remainder of the document.

I've found this in vscode, the original issue I created is adrhumphreys/vscode-silverstripe#22 but the TL;DR: is

<style>a</style>

everything after a is incorrectly recognized as a CSS selector.

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