HTML book recommendation

This is a bit off-topic, but I'm curious what you PHP'ers would recommend as a good HTML book. I think I need to learn some stylesheet stuff and the tutorial I've got covers the basics, but I'd like some more in-depth info on the commands. Is the O'Reilley(sp?) book the best, or are there better out there? -Michael -- No, my friend, the way to have good and safe government, is not to trust it all to one, but to divide it among the many, distributing to every one exactly the functions he is competent to. It is by dividing and subdividing these republics from the national one down through all its subordinations, until it ends in the administration of every man's farm by himself; by placing under every one what his own eye may superintend, that all will be done for the best. -- Thomas Jefferson, to Joseph Cabell, 1816