http://code.google.com/edu/submissions/html-css-javascript/ http://code.google.com/edu/submissions/html-css-javascript/ Look at the css section. id's, classes,

http://code.google.com/edu/submissions/html-css-javascript/ http://code.google.com/edu/submissions/html-css-javascript/ Look at the css section. id's, classes, and selectors have weights which are used to determine which rule wins in the event of a conflict.