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This question already has an answer here:

What is the correct syntax:

  • "Which browsers do support this?"
  • "Which browsers support this?"
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marked as duplicate by RegDwigнt Feb 6 '13 at 11:25

This question was marked as an exact duplicate of an existing question.

2  
Both are correct in their own context, but the first implies emphasis: "Well, which browsers do support this, then?!" Context is important: what triggers this question? – Andrew Leach Feb 6 '13 at 11:10
    
Ok. There's not much context. I was just wondering if one of those was incorrect. I have the answer then. Thank you :) – fiddler Feb 6 '13 at 11:17
    
    
@RegDwighт Sorry, I did not know ell.stackexchange.com – fiddler Feb 6 '13 at 12:19
up vote 0 down vote accepted

The do form contrasts with a previous statement:

"You could use canvas, but not all browsers support it".

"Which browsers do support it?"

It's not restricted to the interrogative. It's one case of do-support.

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