I noticed a small Accessibility issue on the test page https://en.wikipedia.beta.wmcloud.org/wiki/Programming_(music). When I click the baby globe the click handler is temporarily removed (the user can notice this because the mouse pointer changes) and the code tries to display a different picture. However, when the loading time for this second picture is longer than the default delay (which can happen for various reasons) I never see it. The delay is over and the first image shown again before I had a chance to see the second picture.

This is confusing and creates the impression the click handler is broken.

Suggestion: Make sure the second image is loaded and only then start the timer.