40 lines
1.4 KiB
HTML
40 lines
1.4 KiB
HTML
<!doctype html>
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<title>Dynamic evaluation of media queries works fine in presence of empty media rule</title>
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<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
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<link rel="author" href="https://mozilla.org" title="Mozilla">
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1669600">
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<link rel="help" href="https://drafts.csswg.org/mediaqueries-4/">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<iframe width=500 height=300 frameborder=0></iframe>
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<script>
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let iframe = document.querySelector("iframe");
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promise_test(async function (t) {
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await new Promise(resolve => {
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window.addEventListener("load", resolve);
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});
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let frameLoaded = new Promise(resolve => {
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iframe.addEventListener("load", resolve);
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});
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iframe.srcdoc = `
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<style>
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:root { background-color: red; }
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/* This one should never apply */
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@media (min-width: 1500px) {}
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/* This one should change and start matching */
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@media (max-width: 400px) {
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:root { background-color: lime; }
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}
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</style>
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`;
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await frameLoaded;
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function getColor() {
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return iframe.contentWindow.getComputedStyle(iframe.contentDocument.documentElement).backgroundColor;
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}
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assert_equals(getColor(), "rgb(255, 0, 0)", "Should start red");
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iframe.width = 400;
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assert_equals(getColor(), "rgb(0, 255, 0)", "Should turn green");
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});
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</script>
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