16517 2012-03-26 05:47:02 +0000 CSS variables: Need a way to define a default value 2012-07-16 18:41:58 +0000 1 1 1 Unclassified CSS Variables unspecified PC All NEW P2 normal --- 1 rolandsteiner jackalmage adrian.yanes public-css-bugzilla oldest_to_newest 66035 0 rolandsteiner 2012-03-26 05:47:02 +0000 In the current CSS variables spec, AFAICT it is not possible to specify a default value if a variable is not defined. For example, one cannot write: p { background-color: black; background-color: var(user-bg-color); } to have the background color default of "black" be overwritten with the contents of "var-user-bg-color", since the latter will always be selected, and revert to invalid (i.e., transparent) rather than black if that variable is not defined. One way to allow this (IMHO essential) use case is to add a default-value parameter to the var() function: p { background-color: var(user-bg-color, black); } In this case, it should be allowed to nest var() functions, for multiple levels of fall-back: .menuitem { background-color: var(menu-item-bg, var(menu-bg, navy)); }