User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:49.0) Gecko/20100101 Firefox/49.0 Build ID: 20160922113459 Steps to reproduce: Run this test from SVG 1.1 SE test suite https://www.w3.org/Graphics/SVG/Test/20110816/harness/htmlObjectApproved/painting-marker-07-f.html Actual results: No green triangles rendered. Expected results: Green triangles should render, as shown in the reference. See SVG 2 spec: https://www.w3.org/TR/SVG2/painting.html#RenderingMarkers Markers are not rendered directly and must be referenced by one of the marker properties to be rendered. The display value for the ‘marker’ element must always be set to none by the user agent style sheet, and this declaration must have importance over any other CSS rule or presentation attribute. ‘marker’ elements are available for referencing even when the display property on the ‘marker’ element or any of its ancestors is set to none.