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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>MathML lengths (vi, vb)</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#css-styling">
<link rel="help" href="https://w3c.github.io/mathml-core/#types-for-mathml-attribute-values">
<link rel="help" href="https://www.w3.org/TR/css-values-4/#relative-lengths">
<link rel="help" href="https://www.w3.org/TR/css-values-4/#viewport-relative-units">
<meta name="assert" content="Verify that vi and vb correctly take this element's inline and block axes/writing mode into consideration in MathML.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/feature-detection.js"></script>
</head>
<body>
<div id="log"></div>
<iframe id="iframe" width="800" height="500"></iframe>
<script>
const epsilon = 0.5;
const percent = 8;
const doc = document.querySelector("#iframe").contentDocument;
const win = document.querySelector("#iframe").contentWindow;
const vw = win.innerWidth*percent*0.01;
const vh = win.innerHeight*percent*0.01;
["horizontal-tb", "vertical-rl"].forEach(wm => {
test(function(t) {
t.add_cleanup(() => { doc.body.innerHTML = ""; });
doc.body.innerHTML = `
<style>html { writing-mode: ${wm}; }</style>
<math>
<mspace id="unitVi" width="${percent}vi"/>
<mspace id="unitVb" width="${percent}vb"/>
</math>
`.trim();
const vi = doc.querySelector("#unitVi").getBoundingClientRect().width;
const vb = doc.querySelector("#unitVb").getBoundingClientRect().width;
if (wm === "horizontal-tb") {
assert_approx_equals(vi, vw, epsilon, "vi in horizontal writing modes");
assert_approx_equals(vb, vh, epsilon, "vb in horizontal writing modes");
} else if (wm === "vertical-rl") {
assert_approx_equals(vi, vh, epsilon, "vi in vertical writing modes");
assert_approx_equals(vb, vw, epsilon, "vb in vertical writing modes");
}
}, `vi/vb in ${wm} writing modes`);
});
</script>
</body>
</html>
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