49 lines
1.3 KiB
HTML
49 lines
1.3 KiB
HTML
<html>
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<head>
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<title>CSS4 media query test: prefers-contrast using matchMedia and addListener.</title>
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<script>
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function runTest()
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{
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if (!window.internals)
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return;
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var query = window.matchMedia("(prefers-contrast)");
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query.addListener(() => {
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document.getElementById("after").textContent = query.matches ? "true" : "false";
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queryFired = true;
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checkDone();
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});
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document.getElementById("before").textContent = query.matches ? "true" : "false";
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window.internals.settings.forcedPrefersContrastAccessibilityValue = "on";
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testRunner.runUIScript(`
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(function() {
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uiController.simulateAccessibilitySettingsChangeNotification(function() {
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uiController.uiScriptComplete("Done");
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});
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})();`, function (result) {
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scriptRan = true;
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checkDone();
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}
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);
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}
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let queryFired = false;
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let scriptRan = false;
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function checkDone() {
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if (queryFired && scriptRan)
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testRunner.notifyDone();
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}
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window.addEventListener("load", runTest, false);
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</script>
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</head>
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<body>
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<p>Initial value of query.matches: <span id="before">unknown</span> - should be false</p>
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<p>Updated value of query.matches: <span id="after">unknown</span> - should be true</p>
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<p>Note the updated value will only be filled if the listener fires.</p>
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</body>
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</html>
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