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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Motion Path Module Level 1: parsing offset-path with valid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.fxtf.org/motion-1/#offset-path-property">
+<meta name="assert" content="offset-path supports the full grammar from the spec.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("offset-path", "none");
+
+test_valid_value("offset-path", "ray(0deg)");
+test_valid_value("offset-path", "ray(0rad closest-side)", "ray(0rad)");
+test_valid_value("offset-path", "ray(0.25turn closest-corner contain)");
+test_valid_value("offset-path", "ray(200grad farthest-side)");
+test_valid_value("offset-path", "ray(270deg farthest-corner contain)");
+test_valid_value("offset-path", "ray(-720deg sides)");
+test_valid_value("offset-path", "ray(calc(180deg - 45deg) farthest-side)", "ray(calc(135deg) farthest-side)");
+test_valid_value("offset-path", "ray(0deg at 100px 100px)");
+test_valid_value("offset-path", "ray(0deg sides at center center)");
+test_valid_value("offset-path", "ray(0deg at center center sides)", "ray(0deg sides at center center)");
+test_valid_value("offset-path", "ray(0deg at center center contain)", "ray(0deg contain at center center)");
+test_valid_value("offset-path", "ray(at 10px 10px 0deg contain)", "ray(0deg contain at 10px 10px)");
+
+test_valid_value("offset-path", 'path("m 20 0 h -100")');
+test_valid_value("offset-path", 'path("M 0 0 L 100 100 M 100 200 L 200 200 Z L 300 300 Z")');
+test_valid_value("offset-path", 'path("m 10 20 q 30 60 40 50 q 100 70 90 80")');
+test_valid_value("offset-path", 'path("M 0 0 L 100 100 m 0 100 l 100 0 Z l 160 20 Z")');
+test_valid_value("offset-path", 'path("m 10 20 l 20 30 Z l 50 60 Z m 70 80 l 90 60 Z t 70 120")');
+test_valid_value("offset-path", 'path("m 10 170 h 90 v 30 m 0 0 s 1 2 3 4 z c 9 8 7 6 5 4")', 'path("m 10 170 h 90 v 30 m 0 0 s 1 2 3 4 Z c 9 8 7 6 5 4")');
+test_valid_value("offset-path", 'path("m 10 20 a 10 20 30 1 0 40 50 a 110 120 30 1 1 140 50")');
+test_valid_value("offset-path",
+    'path("m 10 20   l 20 30   Z   l 50 60   Z   m 70 80   l 90 60   Z   t 70 120")',
+    'path("m 10 20 l 20 30 Z l 50 60 Z m 70 80 l 90 60 Z t 70 120")'
+);
+test_valid_value("offset-path",
+    'path("m 10.0 170.0 h 90.00 v 30.00 m 0 0 s 1 2 3 4 z c 9 8 7 6 5 4")',
+    'path("m 10 170 h 90 v 30 m 0 0 s 1 2 3 4 Z c 9 8 7 6 5 4")'
+);
+test_valid_value("offset-path",
+    '  path(  "m 10 20 a 10 20 30 1 0 40 50 a 110 120 30 1 1 140 50"  )  ',
+    'path("m 10 20 a 10 20 30 1 0 40 50 a 110 120 30 1 1 140 50")'
+);
+
+test_valid_value("offset-path", 'url("http://www.example.com/index.html#polyline1")');
+
+// https://drafts.csswg.org/css-shapes-1/#basic-shape-serialization
+test_valid_value("offset-path", "inset(100%)");
+test_valid_value("offset-path", "inset(0 1px)", "inset(0px 1px)");
+test_valid_value("offset-path", "inset(0px 1px 2%)");
+test_valid_value("offset-path", "inset(0px 1px 2% 3em)");
+test_valid_value("offset-path", "inset(0px round 100%)");
+test_valid_value("offset-path", "inset(0px round 0 1px)", "inset(0px round 0px 1px)");
+test_valid_value("offset-path", "inset(0px round 0px 1px 2%)");
+test_valid_value("offset-path", "inset(0px round 0px 1px 2% 3em)");
+test_valid_value("offset-path", "inset(10px round 20% / 0px 1px 2% 3em)");
+
+test_valid_value("offset-path", "circle()");
+test_valid_value("offset-path", "circle(100px)");
+test_valid_value("offset-path", "circle(closest-side)", "circle()");
+test_valid_value("offset-path", "circle(at 50% 50%)");
+test_valid_value("offset-path", "circle(100px at 50% 50%)");
+test_valid_value("offset-path", "circle(farthest-side at 0% 0%)");
+
+test_valid_value("offset-path", "ellipse()");
+test_valid_value("offset-path", "ellipse(1px closest-side)");
+test_valid_value("offset-path", "ellipse(at 50% 50%)");
+test_valid_value("offset-path", "ellipse(closest-side closest-side at 10% 20%)", "ellipse(at 10% 20%)");
+test_valid_value("offset-path", "ellipse(farthest-side 4% at 0% 100%)");
+
+test_valid_value("offset-path", "polygon(1% 2%)");
+test_valid_value("offset-path", "polygon(1px 2px, 3em 4em)");
+
+test_valid_value("offset-path", "xywh(0 1% 2px 3em)", "xywh(0px 1% 2px 3em)");
+test_valid_value("offset-path", "xywh(0px 1% 2px 3em round 0)", "xywh(0px 1% 2px 3em)");
+test_valid_value("offset-path", "xywh(0px 1% 2px 3em round 0 1px)", "xywh(0px 1% 2px 3em round 0px 1px)");
+test_valid_value("offset-path", "xywh(0px 1% 2px 3em round 0px 1px 2%)");
+test_valid_value("offset-path", "xywh(0px 1% 2px 3em round 0px 1px 2% 3em)");
+
+test_valid_value("offset-path", "rect(0 100% 200px 4em)", "rect(0px 100% 200px 4em)");
+test_valid_value("offset-path", "rect(auto auto auto auto)");
+test_valid_value("offset-path", "rect(0px 100% auto 4em round 0)", "rect(0px 100% auto 4em)");
+test_valid_value("offset-path", "rect(0px 100% auto 4em round 0 1px)", "rect(0px 100% auto 4em round 0px 1px)");
+test_valid_value("offset-path", "rect(0px 100% auto 4em round 0px 1px 2%)");
+test_valid_value("offset-path", "rect(0px 100% auto 4em round 0px 1px 2% 3em)");
+
+test_valid_value("offset-path", "content-box");
+test_valid_value("offset-path", "border-box");
+test_valid_value("offset-path", "view-box");
+
+test_valid_value("offset-path", "inset(10% 20% 30% 40%) border-box", "inset(10% 20% 30% 40%)");
+test_valid_value("offset-path", "fill-box ellipse(50% 60%)", "ellipse(50% 60%) fill-box");
+test_valid_value("offset-path", "content-box ellipse(50% 60% at 50% 50%)", "ellipse(50% 60% at 50% 50%) content-box");
+test_valid_value("offset-path", "ray(0deg) stroke-box");
+test_valid_value("offset-path", 'path("m 20 0 h -100") view-box');
+</script>
+</body>
+</html>