mozilla-central/dom/events/test/test_deltaMode_lines_always_enabled.html

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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>Test for always-enabling lines deltaMode</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/EventUtils.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
<p id="display"></p>
<div id="overflow" style="height: 300vh"></div>
<pre id="test"></pre>
<script>
SimpleTest.waitForExplicitFinish();
const HACK_PREF = "dom.event.wheel-deltaMode-lines.always-enabled";
(async function() {
await SimpleTest.promiseFocus(window);
await SpecialPowers.pushPrefEnv({
set: [
[HACK_PREF, document.domain],
["test.events.async.enabled", true],
],
});
// FYI: Cannot use scrollingElement because it's center may be outside of the viewport.
await promiseElementReadyForUserInput(document.querySelector("a[href]"));
await SpecialPowers.pushPrefEnv({
clear: [
["test.events.async.enabled"],
],
});
document.addEventListener("wheel", e => {
e.deltaY; /* access the delta unchecked */
is(e.deltaMode, WheelEvent.DOM_DELTA_LINE, "Accessing wheel event data should return lines even if unchecked, if the pref is enabled for that domain");
SimpleTest.finish();
}, { once: true });
synthesizeWheel(document.scrollingElement, 10, 10, { deltaY: 3.0, deltaMode: WheelEvent.DOM_DELTA_LINE });
}());
</script>