File: rem-unit-root-element.html

package info (click to toggle)
firefox-esr 128.14.0esr-1~deb13u1
  • links: PTS, VCS
  • area: main
  • in suites: trixie
  • size: 4,230,204 kB
  • sloc: cpp: 7,104,278; javascript: 6,088,450; ansic: 3,654,017; python: 1,212,326; xml: 594,604; asm: 420,652; java: 182,969; sh: 71,124; makefile: 20,747; perl: 13,449; objc: 12,399; yacc: 4,583; cs: 3,846; pascal: 2,973; lex: 1,720; ruby: 1,194; exp: 762; php: 436; lisp: 258; awk: 247; sql: 66; sed: 54; csh: 10
file content (26 lines) | stat: -rw-r--r-- 1,094 bytes parent folder | download | duplicates (19) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
 
<!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>