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Currently it is marked as nullable. However, Firefox [1], WebKit [2] and Blink [3] implemented addPath with the matrix as an optional parameter. Can the spec be updated to reflect this? 1: https://bugzilla.mozilla.org/show_bug.cgi?id=985801 2: https://bugs.webkit.org/show_bug.cgi?id=130461 3: https://codereview.chromium.org/170503002