Buttons that look real and do nothing

A first-time visitor does not know your app. They read the label and tap it. If the page stays still, the app feels broken.

This happens when a button has no click handler, when the handler returns early, or when a link points at "#" and nothing else.

It also happens when the useful action is on a second button the person never sees, and the big one is only decoration.

A useful test clicks the obvious buttons and watches for a change: a new page, a new message, or a request. If none of those happen, the button is dead.

We never click a pay button, and we never type a card number. Those flows need a person. Dead buttons on the first screen do not.