Saw this breakdown over at one of my buddies sites this morning and found it pretty interesting and anticipated at the same time. Coming from the big Goog’s themselves, and you know they have the logs and data backing to prove the numbers, it’s interesting to see the breakdown, they do have a lot more on the site to read through.

The ten elements used on the most pages, and the twenty attributes that the most pages use with those elements:
Google Code: Web Authoring Statistics: Elements and attributes
Most people (roughly 98%) includehead,
html,
titleand
bodyelements. This is somewhat ironic, since three of those four elements are optional in HTML. It’s interesting to see that most pages have a title, though.
The most-used element other than those four is the
aelement. Almost all pages that have an a element specify the
hrefattribute on an a element somewhere, and more than half of pages use the
targetattribute on the a element somewhere.
The next most used element is the
imgelement, with three quarters of all pages using the deprecated
borderattribute on at least one of img element, and around 24% of pages that use img elements not specifing
altattributes on any of their images.