The orgs that back the group all routinely do things they slam the W3C fellows for (which the W3C stopped doing a long time ago)
— I mean.... Documentation has not been written
CSSStyleSheet.cssRules Returns a live CSSRuleList, listing the CSSRule objects in the style sheet. This is normally used to access individual rules like this: styleSheet.cssRules[i] // where i = 0..cssRules.length-1 To add or remove items in cssRules, use the CSSStyleSheet's deleteRule() and insertRule() methods, described below.