Been writing a CSS parser (don't ask) and all was going well until I had to validate THIS: http://mathiasbynens.be/demo/html5-id
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@mathias Seriously. I thought I had the W3C's official spec down. Then I realised I lacked support for an escaped smiley face as a selector!Thanks. Twitter will use this to make your timeline better. UndoUndo
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JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.