-<dd>This term has two slightly different meanings this specification. First, a CSS parser must follow certain rules when it discovers unknown or illegal syntax in a style sheet. The parser must then ignore certain parts of the style sheets. The exact rules for what parts must be ignored is given in these section: <a href="syndata.html#q8">Declarations and properties</a>, <a href="syndata.html#parsing-errors">Rules for handling parsing errors</a>, <a href="syndata.html#q20">Unsupported Values</a>, or may be explained in the text where the term "ignore" appears. Second, a user agent may (and, in some cases must) disregard certain properties or values in the style sheet even if the syntax is legal. For example, table-column-group elements cannot have borders around them, so the border properties must be ignored.
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