chromium/third_party/blink/web_tests/external/wpt/pointerevents/compat/pointerevent_mouseevent_key_pressed.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <title>Mouse events with keys pressed</title>
        <link rel="author" title="Google" href="http://www.google.com/" />
        <script src="/resources/testharness.js"></script>
        <script src="/resources/testharnessreport.js"></script>
        <script src="/resources/testdriver.js"></script>
        <script src="/resources/testdriver-vendor.js"></script>
        <script src="/resources/testdriver-actions.js"></script>
        <script type="text/javascript" src="../pointerevent_support.js"></script>
        <script>
          let testMouseKeyPressed = async_test('Tests that the mouse events with some keys pressed.');
          let activeKeys = false;

          window.addEventListener('pointermove', function(e) {
            activeKeys = e.getModifierState("Alt") &&
                         e.getModifierState("Control") &&
                         e.getModifierState("Meta") &&
                         e.getModifierState("Shift");
          });

          async function runTest(){
            let event_watcher = new EventWatcher(testMouseKeyPressed, window, ["pointermove"],
              ()=>waitForAnimationFrames(200));
            await Promise.all([event_watcher.wait_for(["pointermove"]), inject_input()]);
            testMouseKeyPressed.step_func_done(()=>{
              assert_true(activeKeys, "Modifier keys not reflected in the pointermove event!");
            })();
          }

          function inject_input() {
            const x = 100;
            const y = 100;
            const altKey = '\uE00A';
            const ctrlKey = '\uE009';
            const metaKey = '\uE03d';
            const shiftKey = '\uE008'

            // First press Alt, Control, Meta, Shift keys and then send a mouse move.
            return new test_driver.Actions()
                      .keyDown(altKey)
                      .keyDown(ctrlKey)
                      .keyDown(metaKey)
                      .keyDown(shiftKey)
                      .pointerMove(x,y)
                      .send();
          }
        </script>

    </head>
    <body id="target" onload="runTest()">
        <h4>Test Description: Tests that the mouse events with some keys pressed.
            <ol>
                <li>Press Alt, Control, Meta, Shift keys and move the mouse</li>
            </ol>
        </h4>
    </body>
</html>