I'm using some HTML5 features on a web page and wondered what the best DOCTYPE is. Currently, this is the DOCTYPE and XMLNS:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
Yes, older browsers will work fine. The reason "<!DOCTYPE html>" was chosen in HTML 5 is because it is the smallest a doctype can be and yet still trigger standards compliance mode on those browsers you mention.