[WSG] WAI3 in a strict DOCTYPE

I've run into a wall. I wasn't trying for WAI Level 3, but I've usually been pretty close to achieving it. Bobby always yells at me to specify the language of the document using the attribute lang=en in the HTML header. W3C tells me though that lang=en isn't a valid attribute. Do you have to

Re: [WSG] WAI3 in a strict DOCTYPE

I've run into a wall. I wasn't trying for WAI Level 3, but I've usually been pretty close to achieving it. Bobby always yells at me to specify the language of the document using the attribute lang=en in the HTML header. W3C tells me though that lang=en isn't a valid attribute. Do you have to