LayoutTests/pointer-lock/pointermove-movement-delta.html

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
</head>
<body>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script src="../pointerevents/utils.js"></script>
<script>

"use strict";

target_test((target, test) => {
    eventSender.mouseMoveTo(100, 100);

    target.addEventListener("pointermove", (event) => {
        assert_equals(event.x, 150, "The x property value is as expected.");
        assert_equals(event.y, 150, "The y property value is as expected.");

        assert_equals(event.movementX, 50, "The movementX property value is as expected.");
        assert_equals(event.movementY, 50, "The movementY property value is as expected.");

        test.done();
    });

    eventSender.mouseMoveTo(150, 150);
}, "Testing the movementX and movementY properties of a pointer event triggered by a mouse.");

</script>
</body>
</html>