Is it allowed to have a self-closing div tag in an html document?

Question

This question refers specifically to a script tag. I think it applies also to a div, but I just want to make sure. Is this legal html or not?

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Answer 1

No it isn't legal HTML.

The div element is not described as an EMPTY element in the DTD (4.01).

The definition doesn't have EMPTY:

<!ELEMENT DIV - - (%flow;)*            -- generic language/style container -->
<!ATTLIST DIV
  %attrs;                              -- %coreattrs, %i18n, %events --
  %reserved;                           -- reserved for possible future use --
  >

Contrast with the definition for HR:

<!ELEMENT HR - O EMPTY -- horizontal rule -->
<!ATTLIST HR
  %attrs;                              -- %coreattrs, %i18n, %events --
  >