> http://www.w3.org/TR/REC-DOM-Level-1/level-one-html.html > ------------------------------------------------------ > readonly attribute long length; > ------------------------------------------------------ That was DOM Level 1 (1999). Even level 2 (2000) has this as read-write: http://www.w3.org/TR/DOM-Level-2-HTML/html.html#ID-94282980 Also keep in mind that with relatively few exceptions, W3C simply trailed and struggled to capture status quo (or some compromise representation thereof) back then. /mz