[RC3] before-after-dynamic-attr-001 relies on CSS3 double-colon pseudo-element

http://test.csswg.org/suites/css2.1/20101027/html4/before-after-dynamic-attr-001.htm

http://test.csswg.org/suites/css2.1/20101027/xhtml1/before-after-dynamic-attr-001.xht

body::before {
  content:attr(my-attr);
}
body::after {
  content:attr(my-attr-2);
}

is CSS3 double-colon pseudo-element grammar.

Also, the testcases should declare
<meta http-equiv="Content-Script-Type" content="text/javascript">

regards, Gérard
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