Completely untested tagOpen and tagClose handlers with child states.
Completely untested tagOpen and tagClose handlers with child states.

tagOpenHandler, tagNameHandler, endTagOpenHandler, bogusCommentHandler,
and supporting {push,pop}Node and addChild helpers.

rtfb/go-html-transform,dushmis/go-html-transform,imdario/go-html-transform,lambdaX/go-html-transform,wangcheng711/go-html-transform,webfd/go-html-transform,x140cc/go-html-transform,d0f/go-html-transform