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Test Info:

<!DOCTYPE HTML>
<title>SVGDefsElement interface</title>
<link rel="author" title="Timothy Gu" href="mailto:timothygu99@gmail.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<svg id="svg">
<defs id="defs">
<circle id="myCircle" cx="0" cy="0" r="5" />
</defs>
</svg>
<script>
"use strict";
test(() => {
const svg = document.getElementById("svg");
const defs = document.getElementById("defs");
assert_true(defs instanceof SVGDefsElement);
assert_true(defs instanceof SVGGraphicsElement);
assert_equals(defs.ownerSVGElement, svg);
assert_equals(defs.viewportElement, svg);
}, "Basic properties");
test(() => {
const defs = document.createElementNS("http://www.w3.org/2000/svg", "defs");
assert_true(defs instanceof SVGDefsElement);
assert_true(defs instanceof SVGGraphicsElement);
assert_equals(defs.ownerSVGElement, null);
assert_equals(defs.viewportElement, null);
}, "Detached");
</script>