HTML attributes with comma in value throws the whole tag off

[rickharris]

For example, <meta name="viewport" content="width=device-width, initial-scale=1.0"> is a common practice for mobile-friendly development. When written in jade.php as meta(name="viewport", content="width=device-width, initial-scale=1.0"), it is rendered as <meta name="viewport" content="width=device-width" initial-scale="1.0" />. The Javascript version does not currently have this bug.

[rickharris]

I see now that the comma is not the issue, as you have passing tests for attributes with commas in them, so this issue is titled badly, but there is an issue with this particular test case.