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chromium/third_party/blink/web_tests/svg/custom/svg-viewBox-dynamic.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../resources/js-test.js"></script>
</head>
<body>
<script>
description("Tests whether removing the viewBox attribute propagates to the viewBox DOM values.");

var svgDoc = document.implementation.createDocument("http://www.w3.org/2000/svg", "svg", null);
var svg = svgDoc.rootElement;

svg.setAttribute("viewBox", "20 10 200 100");
shouldBe("svg.viewBox.baseVal.x", "20");
shouldBe("svg.viewBox.baseVal.y", "10");
shouldBe("svg.viewBox.baseVal.width", "200");
shouldBe("svg.viewBox.baseVal.height", "100");
svg.removeAttribute("viewBox");
shouldBe("svg.viewBox.baseVal.x", "0");
shouldBe("svg.viewBox.baseVal.y", "0");
shouldBe("svg.viewBox.baseVal.width", "0");
shouldBe("svg.viewBox.baseVal.height", "0");

svg.setAttribute("viewBox", "20 10 200 100");
shouldBe("svg.viewBox.baseVal.x", "20");
shouldBe("svg.viewBox.baseVal.y", "10");
shouldBe("svg.viewBox.baseVal.width", "200");
shouldBe("svg.viewBox.baseVal.height", "100");
svg.setAttribute("viewBox", "invalid value");
shouldBe("svg.viewBox.baseVal.x", "0");
shouldBe("svg.viewBox.baseVal.y", "0");
shouldBe("svg.viewBox.baseVal.width", "0");
shouldBe("svg.viewBox.baseVal.height", "0");
shouldBe("svg.getAttribute('viewBox')", "'invalid value'");

var successfullyParsed = true;
</script>
</body>
</html>