This is a test of the SVGPathSegList::replaceItem() API. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". Check initial 'pathSegList' value of path1 PASS path1.pathSegList.numberOfItems is 6 PASS path1.pathSegList.getItem(0).toString() is "[object SVGPathSegMovetoAbs]" PASS path1.pathSegList.getItem(0).x is 0 PASS path1.pathSegList.getItem(0).y is 0 PASS path1.pathSegList.getItem(1).toString() is "[object SVGPathSegLinetoAbs]" PASS path1.pathSegList.getItem(1).x is 100 PASS path1.pathSegList.getItem(1).y is 100 PASS path1.pathSegList.getItem(2).toString() is "[object SVGPathSegLinetoAbs]" PASS path1.pathSegList.getItem(2).x is 100 PASS path1.pathSegList.getItem(2).y is 0 PASS path1.pathSegList.getItem(3).toString() is "[object SVGPathSegLinetoAbs]" PASS path1.pathSegList.getItem(3).x is 100 PASS path1.pathSegList.getItem(3).y is 100 PASS path1.pathSegList.getItem(4).toString() is "[object SVGPathSegLinetoVerticalRel]" PASS path1.pathSegList.getItem(4).y is 100 PASS path1.pathSegList.getItem(5).toString() is "[object SVGPathSegLinetoAbs]" PASS path1.pathSegList.getItem(5).x is 0 PASS path1.pathSegList.getItem(5).y is 100 Check initial 'pathSegList' value of path2 PASS path2.pathSegList.numberOfItems is 4 PASS path2.pathSegList.getItem(0).toString() is "[object SVGPathSegMovetoAbs]" PASS path2.pathSegList.getItem(0).x is 0 PASS path2.pathSegList.getItem(0).y is 0 PASS path2.pathSegList.getItem(1).toString() is "[object SVGPathSegLinetoHorizontalRel]" PASS path2.pathSegList.getItem(1).x is 100 PASS path2.pathSegList.getItem(2).toString() is "[object SVGPathSegLinetoAbs]" PASS path2.pathSegList.getItem(2).x is 200 PASS path2.pathSegList.getItem(2).y is 100 PASS path2.pathSegList.getItem(3).toString() is "[object SVGPathSegLinetoHorizontalRel]" PASS path2.pathSegList.getItem(3).x is -100 Replace second item with third item of path1 PASS path1.pathSegList.replaceItem(path1.pathSegList.getItem(2), 1).toString() is "[object SVGPathSegLinetoAbs]" Replace third item of path2 with fourth item of path1 PASS path2.pathSegList.replaceItem(path1.pathSegList.getItem(3), 2).toString() is "[object SVGPathSegLinetoVerticalRel]" Check final 'pathSegList' value of path1 PASS path1.pathSegList.numberOfItems is 4 PASS path1.pathSegList.getItem(0).toString() is "[object SVGPathSegMovetoAbs]" PASS path1.pathSegList.getItem(0).x is 0 PASS path1.pathSegList.getItem(0).y is 0 PASS path1.pathSegList.getItem(1).toString() is "[object SVGPathSegLinetoAbs]" PASS path1.pathSegList.getItem(1).x is 100 PASS path1.pathSegList.getItem(1).y is 0 PASS path1.pathSegList.getItem(2).toString() is "[object SVGPathSegLinetoAbs]" PASS path1.pathSegList.getItem(2).x is 100 PASS path1.pathSegList.getItem(2).y is 100 PASS path1.pathSegList.getItem(3).toString() is "[object SVGPathSegLinetoAbs]" PASS path1.pathSegList.getItem(3).x is 0 PASS path1.pathSegList.getItem(3).y is 100 Check final 'pathSegList' value of path2 PASS path2.pathSegList.numberOfItems is 4 PASS path2.pathSegList.getItem(0).toString() is "[object SVGPathSegMovetoAbs]" PASS path2.pathSegList.getItem(0).x is 0 PASS path2.pathSegList.getItem(0).y is 0 PASS path2.pathSegList.getItem(1).toString() is "[object SVGPathSegLinetoHorizontalRel]" PASS path2.pathSegList.getItem(1).x is 100 PASS path2.pathSegList.getItem(2).toString() is "[object SVGPathSegLinetoVerticalRel]" PASS path2.pathSegList.getItem(2).y is 100 PASS path2.pathSegList.getItem(3).toString() is "[object SVGPathSegLinetoHorizontalRel]" PASS path2.pathSegList.getItem(3).x is -100 PASS successfullyParsed is true TEST COMPLETE