PureHTML.TreeBuilder.Modes.InHeadNoscript (PureHTML v0.4.0)

HTML5 "in head noscript" insertion mode.

This mode handles content inside a <noscript> element within <head>.

Per HTML5 spec:

Character tokens (whitespace): process using "in head" rules
Comments: process using "in head" rules
DOCTYPE: parse error, ignore
Start tags:
- html: process using "in body" rules
- basefont, bgsound, link, meta, noframes, style: process using "in head" rules
- head, noscript: parse error, ignore
- Anything else: parse error, pop noscript, switch to "in head", reprocess
End tags:
- noscript: pop noscript, switch to "in head"
- br: parse error, pop noscript, switch to "in head", reprocess
- Anything else: parse error, ignore
EOF: anything else (parse error, pop noscript, switch to "in head", reprocess)