How a Playwright test clicked a button real users could never reach

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A developer shipped a blog editor inside a dashboard that accidentally rendered in a fixed, non-scrollable shell due to a missing exclusion condition, cutting off the bottom of the form for all users. The end-to-end test still passed because Playwright's click() method automatically scrolls elements into view via JavaScript, bypassing the overflow:hidden restriction that blocked mouse and keyboard input. This revealed a key misunderstanding: an element with overflow:hidden still has a live scrollTop property and can be scrolled programmatically, even though users cannot scroll it manually. The bug was fixed with a two-word code addition and an inline comment to warn future developers. The incident highlights how automated tests can silently succeed on interactions that are genuinely inaccessible to real users.

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