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<!doctype html>
<title>CSS Values and Units Test: rem units on the root element</title>
<link rel="help" href="https://drafts.csswg.org/css-values/#rem">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
:root {
font-size: 50px;
margin-left: 2rem;
padding-top: 2rem;
line-height: 2rem;
}
</style>
<script>
let rootStyle = getComputedStyle(document.documentElement);
test(() => assert_equals(rootStyle.marginLeft, "100px"), "rem based margin.");
test(() => assert_equals(rootStyle.paddingTop, "100px"), "rem based padding.");
test(() => assert_equals(rootStyle.lineHeight, "100px"), "rem based line-height.");
test(() => {
document.documentElement.style.fontSize = "initial";
let initialFontSize = parseInt(getComputedStyle(document.documentElement).fontSize);
document.documentElement.style.fontSize = "3rem";
assert_equals(getComputedStyle(document.documentElement).fontSize, 3*initialFontSize + "px");
}, "Check that rem font-size is based on the initial font-size.");
</script>
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