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<!doctype html>
<meta charset="utf-8">
<title>
Test for bug 1273303: Stylesheet additions and removals known to not
affect the document don't trigger restyles
</title>
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<div class="classScope">
<div></div>
</div>
<div id="idScope">
<div></div>
</div>
<!--
We do it this way, using `disabled`, because appending stylesheets to the
document marks a restyle for that <style> element as needed, so we can't
accurately measure whether we've restyled or not.
-->
<style id="target" disabled></style>
<script>
SimpleTest.waitForExplicitFinish();
const utils = SpecialPowers.getDOMWindowUtils(window);
const TESTS = [
{ selector: ".nonexistentClassScope", restyle: false },
{ selector: ".nonexistentClassScope + div", restyle: true },
{ selector: ".nonexistentClassScope div + div", restyle: false },
{ selector: ".classScope", restyle: true },
{ selector: ".classScope div", restyle: true },
{ selector: "#idScope", restyle: true },
{ selector: "#nonexistentIdScope", restyle: false },
{ selector: "#nonexistentIdScope div + bar", restyle: false },
{ selector: "baz", restyle: false },
{ cssText: " ", restyle: false },
{ cssText: "@keyframes foo { from { color: green } to { color: red } } #whatever { animation-name: foo; }", restyle: false },
];
for (const test of TESTS) {
let cssText = test.cssText ? test.cssText : (test.selector + " { color: green; }");
target.innerHTML = cssText;
document.body.offsetWidth;
const prevGeneration = utils.restyleGeneration;
target.disabled = true;
document.body.offsetWidth;
(test.restyle ? isnot : is)(utils.restyleGeneration, prevGeneration,
`Stylesheet removal with ${cssText} should ${test.restyle ? "have" : "not have"} caused a restyle`);
target.disabled = false; // Make the stylesheet effective.
if (test.selector) {
let element = document.querySelector(test.selector);
if (element) {
is(test.restyle, true, "How could we not expect a restyle?");
is(getComputedStyle(element).color, "rgb(0, 128, 0)",
"Element style should've changed appropriately");
}
}
document.body.offsetWidth;
(test.restyle ? isnot : is)(utils.restyleGeneration, prevGeneration,
`Stylesheet addition with ${cssText} should ${test.restyle ? "have" : "not have"} caused a restyle`);
}
SimpleTest.finish();
</script>