<html><head><style type="text/css">#mostImportant {color:red; background:yellow;}</style></head><body><h1>This is important!</h1><ul id="mostImportant"><li>item 1</li><li>item 2</li><li>item 3</li></ul><p>This is a paragraph.</p><p>This is a paragraph.</p><p>This is a paragraph.</p><p>...</p></body></html>