Crisis? What crisis?

Has HTML 4.01 stopped working in browsers? I was not aware of it. Has XHTML 1.0 stopped working in browsers? I was not aware of it. Do browser makers intend to stop supporting HTML 4.01 and XHTML 1.0? I was not aware of it. Do they intend to stop supporting CSS 1 and CSS 2.1? I was not aware of it.

Jeffrey Zeldman answers Molly Holtzschlag.