Nested Doctype tags

Question

Let's say I begin an HTML file with the usual DOCTYPE declaration. However, let's also assume that another instance of a DOCTYPE tag is introduced inside the body of that document via some soft of included content (eg. a content template).

From my testing this doesn't seem to be a problem. But I was wondering if anyone know of a situation where this would cause problems?

Thanks,

John

Answer 1

The <DOCTYPE> declaration is required to be the first thing in the document. I don't even think it tolerates whitespace before it very well. Subsequent DOCTYPE declarations will be ignored.