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In the CSSMatrix IDL, setMatrixValue() and inverse() both say raises(DOMException). However, WebIDL removed raises() for the second LCWD on September 27, according to the changelog: "Removed raises, setraises and getraises clauses since they do not add any value." http://dev.w3.org/2006/webapi/WebIDL/ "raises(DOMException)" should just be removed from those two lines to make the IDL valid.
This was just necessary for CSSMatrix interface. This was delayed to CSS4 Transforms.