Hi, Note after "10.1.1 The DOCTYPE" : "DOCTYPEs are required for legacy reasons. When omitted, browsers tend to use a different rendering mode that is incompatible with some specifications. Including the DOCTYPE in a document ensures that the browser makes a best-effort attempt at following the relevant specifications."
Reading the following description, I have the impression that HTML6 will require a DOCTYPE as well. Following the hypothesis that the HTML language or HTML parser definition may change, it means that HTML6 may need a different DOCTYPE than HTML5 in order to "[follow] the relevant specifications". What will this doctype be since it cannot be <!DOCTYPE HTML>? The underlying question being : shouldn't doctype be versioned (as it has been with HTML 3.2/4/4.01 and XHTML 1/1.1)? David