wpt/css/selectors/active-after-relayouts.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>

<title>:active pseudo-class works properly when triggering a layout that changes the target's position</title>
<link rel="help" href="https://github.com/servo/servo/issues/43862">
<meta name="author" title="Martin Robinson" href="mailto:martin@abandonedwig.info">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>

<style>
    #target {
        width: 100px;
        height: 100px;
        position: relative;
        background: black;
    }

    #target:active {
        left: 100px;
        height: 100px;
        background: green;
    }
</style>

<div id="target"></div>

<script>
promise_test(async t => {
    const target = document.getElementById("target");

    const event_watcher = new EventWatcher(t, document.body, ["mousedown", "mouseup"]);
    let eventPromise1 = event_watcher.wait_for(["mousedown"]);
    await new test_driver.Actions()
        .pointerMove(5, 5, { origin: target })
        .pointerDown()
        .send();
    await eventPromise1;
    assert_true(target.matches(":active"));

    const eventPromise2 = event_watcher.wait_for(["mouseup"]);
    await new test_driver.Actions()
        .pointerUp()
        .send();
    await eventPromise2;
    assert_false(target.matches(":active"));
});
</script>