Did you even read what you linked to? There is nothing in there about requiring a space before the closing dashes. The only whitespace rules they mention are basically: 
Legal:   "<!--" 
Illegal: "<! --"
  -and-
Legal:  "-->"
Legal:  "--  >"

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Elda Taluta; Sarks Sark; Ark Arks

In reply to Re^2: HTML stripper... by Argel
in thread HTML stripper... by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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