My husband showed me this tonight and I had to pass it on: Safari passes the ACID2 browser compliance test.
The Acid2 test is a page (created by the Web Standards Project) that’s full of every weird piece of CSS, PNG, and HTML that current standards allow. It also includes some invalid CSS which is designed to fail.
To pass the test, a browser has to understand all the page notation. Then it has to handle the errors gracefully. See how your favorite browser fared.