Re: [dom] setAttribute() needs to lowercase for HTML nodes in HTML documents. Fixes #31 (afe5b5e)

Hmm what will break step 4.? Above I'm mean change only:

3. Let attribute be the result of getting an attribute given name and the context object. 
to 
3. Let attribute be the first attribute in context object's attribute list whose name is name, and null otherwise.  

all other steps will be the same.

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