[Question]: Doctype in the canvas iframe

which causes it to be in quirks mode

Which browser?

@artf One issue I noticed with the lack of doctype is with HEX color definitions. If a user defines a HEX color as, e.g.: "fff", rather than "#fff", this will work in the editor, but once the page is rendered inside a HTML with doctype specified, that "fff" color definition fails. Tested this on Mac OS Chrome, Safari and Firefox.

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