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The CanvasRenderingContext2D IDL has: void removeHitRegion(HitRegionOptions options); while the prose for the method [1] say: "Let region be the region identified by the ID given by the method's argument in this canvas element, if any." I interpret the later as the method taking a DOMString rather than a HitRegionOptions dictionary, since for instance the prose for addHitRegion say things like "If the arguments object's id member..." [1] http://www.w3.org/html/wg/drafts/2dcontext/html5_canvas_CR/#dom-context-2d-removehitregion
Fix with https://github.com/w3c/html/commit/5c7362b4a53fcd19d03f170e32ffd1c6e71ef7df