This text will be green if the rule has been applied.
html>body #testElement {
color: #00cc00;
}
In IE 5.0, the child selector will be interpreted correctly (and the rule applied) only if there is whitespace on either side of it (html > body or html> body or html >body). This is a manifestation of the underscore hack.
This filter is commonly used along with Tantek's Box Model Hack to apply the correct box model values to Opera 5 (though, Opera 5 understands the TBMH so this reason doesn't hold) and to prevent Win IE 5.0 from ignoring the rule after the Tantek hack (which is a valid problem). When used in this way, it is sometimes called the "be nice to Opera 5" rule. See Tantek's original Box Model Hack page for more information.
