[whatwg] HTML5 is broken: <menuitem> causes infinite loop

Wed May 8 22:47:08 PDT 2013

Hilarious spec bug of the week: HTML5 requires implementations to loop 
indefinitely if they see a <menuitem> start tag.

12.2.5.4.7 "in body" insertion mode
  => see a <menuitem> start tag, process using rules for "in head"

12.2.5.4.4 "in head" insertion mode
  => see <menuitem>, act as if </head> and reprocess

12.2.5.4.6 "after head" insertion mode
  => see <menuitem>, act as if <body> and reprocess

...and we're back at "in body" insertion mode, and will continue to 
bounce around with the <menuitem> start tag token making absolutely no 
progress whatsoever.

What is the <menuitem> tag supposed to be, anyway? A test to ensure that 
implementers are awake, like the </sarcasm> close tag?

Cheers,

Michael