diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
| commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
| tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /layout/style/test/test_rem_unit.html | |
| parent | Initial commit. (diff) | |
| download | firefox-esr-upstream.tar.xz firefox-esr-upstream.zip | |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'layout/style/test/test_rem_unit.html')
| -rw-r--r-- | layout/style/test/test_rem_unit.html | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/layout/style/test/test_rem_unit.html b/layout/style/test/test_rem_unit.html new file mode 100644 index 0000000000..bd46524798 --- /dev/null +++ b/layout/style/test/test_rem_unit.html @@ -0,0 +1,80 @@ +<!DOCTYPE HTML> +<html> +<!-- +https://bugzilla.mozilla.org/show_bug.cgi?id=478321 +--> +<head> + <title>Test for CSS 'rem' unit</title> + <script src="/tests/SimpleTest/SimpleTest.js"></script> + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> +</head> +<body> +<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=478321">Mozilla Bug 478321</a> +<p id="display"></p> +<p id="display2"></p> +<div id="content" style="display: none"> + +</div> +<pre id="test"> +<script type="application/javascript"> + +/** Test for CSS 'rem' unit **/ + +function px_to_num(str) +{ + return Number(String(str).match(/^([\d.]+)px$/)[1]); +} + +function fs(elt) +{ + return px_to_num(getComputedStyle(elt, "").fontSize); +} + +var html = document.documentElement; +var body = document.body; +var p = document.getElementById("display"); +var p2 = document.getElementById("display2"); + +html.style.font = "initial"; + +var defaultFontSize = fs(html); + +// NOTE: This test assumes that the default font size is an +// integral number of pixels (which is always the case at present). +// If that ever becomes false, the calls to "is" may need to be replaced by +// calls to "isapprox" that allows errors of up to some small fraction +// of a pixel. + +html.style.fontSize = "3rem"; +is(fs(html), 3 * defaultFontSize, + "3rem on root should triple root's font size"); +body.style.font = "initial"; +is(fs(body), defaultFontSize, + "initial should produce initial font size"); +body.style.fontSize = "1em"; +is(fs(body), 3 * defaultFontSize, "1em should inherit from parent"); +body.style.fontSize = "200%"; +is(fs(body), 6 * defaultFontSize, "200% should double parent"); +body.style.fontSize = "2rem"; +is(fs(body), 6 * defaultFontSize, "2rem should double root"); +p.style.font = "inherit"; +is(fs(p), 6 * defaultFontSize, "inherit should inherit from parent"); +p2.style.fontSize = "2rem"; +is(fs(p2), 6 * defaultFontSize, "2rem should double root"); +body.style.font = "initial"; +is(fs(p), defaultFontSize, "inherit should inherit from parent"); +is(fs(p2), 6 * defaultFontSize, "2rem should double root"); +body.style.fontSize = "5em"; +html.style.fontSize = "200%"; +is(fs(p), 10 * defaultFontSize, "inherit should inherit from parent"); +is(fs(p2), 4 * defaultFontSize, "2rem should double root"); + + +// Make things readable again. +html.style.fontSize = "1em"; +body.style.fontSize = "1em"; + +</script> +</pre> +</body> +</html> |