Technically, the HTML spec says that attributes for HTML tags should be name-value pairs with the value quoted. Reducing the size of your generated HTML is admirable, but how you're trying to do it will not gain you any signifigant savings.
String
Length
<font face="arial, helvetica, verdana">
40
<font face=arial, helvetica, verdana>
35
Savings
12.5%
When you consider there are still the end tag and whatever was inside the font tag, your savings goes down even further.
In summary, I would spend most of my effort on a clean design and layout of the webpages, and let the tags fall as they may.