PureHTML.TreeBuilder.Modes.BeforeHead (PureHTML v0.5.0)

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HTML5 "before head" insertion mode.

This mode is entered after the html element is created.

Per HTML5 spec:

  • Whitespace: Ignore
  • Comment: Insert as child of Document
  • DOCTYPE: Parse error, ignore
  • <html> start tag: Process using "in body" rules (merge attrs)
  • <head> start tag: Insert head element, switch to "in head"
  • </head>, </body>, </html>, </br>: Act as "anything else"
  • Any other end tag: Parse error, ignore
  • Anything else: Insert implied <head>, switch to "in head", reprocess

See: https://html.spec.whatwg.org/multipage/parsing.html#the-before-head-insertion-mode