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http://dev.w3.org/fxtf/geometry/#dom-dommatrixreadonly [[ DOMMatrixReadOnly ]] constructor should allow same arguments as DOMMatrix. (There is no DOMMatrixInit, but maybe there's a good reason for that?)
https://github.com/w3c/fxtf-drafts/commit/0ee31d9e01eed3fe44d0710a88e9a3c2796191b5