27911 2015-01-27 22:40:44 +0000 Case sensitivity of ID and Class names 2015-01-27 22:43:35 +0000 1 1 1 Unclassified CSSValidator CSS 3 CSS Validator PC Windows NT NEW P2 enhancement --- 1 h_legg dave.null h_legg www-validator-cvs oldest_to_newest 117523 0 h_legg 2015-01-27 22:40:44 +0000 4.1.3 Characters and case states: "All CSS syntax is case-insensitive within the ASCII range (i.e., [a-z] and [A-Z] are equivalent), except for parts that are not under the control of CSS. For example, the case-sensitivity of values of the HTML attributes "id" and "class", of font names, and of URIs lies outside the scope of this specification." Most browsers ignore it if you have used an id with capitals in the HTML but lower case in the CSS, however Internet Explorer will ignore the selector. It would be good if the validator returned at least a warning of a case mismatch.