gecko-dev/layout/svg/tests/test_bug1544209.html

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<!DOCTYPE HTML>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1544209">Mozilla Bug 1544209</a>
<svg height="800px" width="800px">
<text transform="scale(3,3)" id="a" x="20px" y="20px">ABC<tspan id="b">ABC</tspan></text>
</svg>
<script type="application/javascript">
let a = document.getElementById("a"),
b = document.getElementById("b");
let wtext = a.getBoundingClientRect().width,
wtspan = b.getBoundingClientRect().width;
ok(wtext >= wtspan, "<tspan> should not be wider than <text>");
isfuzzy((wtext - wtspan) / wtext, 0.5, 0.1, "<tspan> should be approximately half of the <text> width");
</script>