CSS: Case Sensitivity

By Xah Lee. Date: . Last updated: .

CSS Selector for HTML tag names

Case-Insensitive 

div { color: red; }

is same as 

DIV { color: red; }

CSS Selector for HTML attribute names

Case-Insensitive 

div.abc { color: red; }

is same as 

div.ABC { color: red; }

CSS Selector for HTML attribute values

Case-Sensitive

/* color span tag with class name starting with abc.
Case-Sensitive
*/
span[class ^="abc"]