Relax <select> parser (WHATWG proposal)
          #1317
        
          
      
                
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html5lib/html5lib-tests#178
The proposal isn't merged yet, and the error codes are off. The forked
html5lib-tests makes it more complicated. I recommend to ditch the fork
of html5lib-tests and give up on standardizing errors, as nobody is driving
this effort.