Hyphens in comments

Hi,

The HTML 4.01 standard says:

   A common error is to include a string of hyphens ("---") within a
   comment. Authors should avoid putting two or more adjacent hyphens
   inside comments.

(Section 3, "SGML and HTML)

However, the validator doesn't complain about constructs like:

   <!-------------->

in HTML mode. Now I wonder: *Is* that allowed, or is it not?...

-Olaf-

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