When I worked for MLive.com, one of our practices was to leave out quotes around attribute values (except for alt attributes). This was to save on bandwidth costs. In spite of the fact that the page was no longer valid HTML (technically), all target browsers rendered the pages properly.
That might seem like nitpicking, but with over a million pageviews a day, all that ASCII can add up. Personally, I would prefer valid HTML, but I bet the financial side of that decision was pretty interesting. Continue reading Clever ways to save bandwidth