Yup, because for it to be XHTML valid, all attributes MUST be quoted regardless of datatype of value (i.e. even if it is a number, or a string without spaces, it still needs quoting).
And of course, feel free to modify all of your code, and then you will see why vBulletin left some pieces of styling and spacing within HTML and not CSS... compatibility for CSS is still shakey for those not using the very latest browsers (still shakey for some that are using the latest browsers).
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