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• fix tokentization of multiple pseudos, e.g. foo:not():not()
• in addition to ", skip ' in attr vals [val='foo']
• add inifinite loop guards to html and css tokenizers

• fix always return array from getSibsOfType()
• fix handle self-closing tags without space after tagname (e.g. <br/>)

• implement [attr~=value]
• properly handle nested pseudos, eg: p:not(:nth-child(n+3)) { }

• handle spaces & junk better in attr selectors during context-free testing

• fix case insensitive html tag matching (e.g. svg tags)
• add another round of stripping remaining/nested empty @ rules, (e.g. @supports ... { @media ... {} })
• pass unused @keyframes and @font-face through shouldDrop()
• Puppeteer demo (with full JS execution)

• handle <keyframes-name> at end of animation: shorthand

• complete rewrite

no changes

• skip processing @ blocks except @media