Key press detection in testbed does not work in Safari

[rgov]

On Safari 18.1, regardless if I set a handler for testbed.keydown or check testbed.activeKeys.right inside testbed.step(), keypresses are not detected. The same code works OK in Firefox:

 testbed.step = function() {
    if (testbed.activeKeys.right) {
        wheel3.setAngularVelocity(-2);
    } else {
        wheel3.setAngularVelocity(0);
    }
  };