Bug 170068

Testcase:
http://www.gtalbot.org/BrowserBugsSection/MSIE7Bugs/HyphenFollowedByADigitInIdentifiers.html

Bug entry:
http://www.gtalbot.org/BrowserBugsSection/MSIE7Bugs/#bug59

CSS 2.1, Section 4.1.3 Characters and case (identifiers) says:

 "in CSS, identifiers (including element names, classes, and IDs in selectors) can contain only the characters [a-z0-9] and ISO 10646 characters U+00A1 and higher, plus the hyphen (-) and the underscore (_); they cannot start with a digit, or a hyphen followed by a digit."
http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier

CSS 2.1, Section 4.1.1 tokenization and CSS 2.1, G.2 Lexical scanner
both gives
 ident -?{nmstart}{nmchar}*
 nmstart [_a-z]|{nonascii}|{escape}

In the testcase, the 2nd <p> is red, not green.

Relevant code:

  .two {color: green; background: white;}
  #-2bar, .two {color: red; background-color: white;}

  <p class="two">This should be green.</p>

Since an id identifier can not start with an hyphen followed by a digit, the 2nd rule should be rejected and only the first rule should apply.

Regards, Gérard