Recently, my team encountered a bizarre bug that only one team member could reproduce. She was able to reproduce it when using her work laptop at home, but not in the office. The bug involved the BBC UK website’s ‘More’ button click event malfunctioning when clicked on an external monitor. This triggered an investigation that uncovered an interoperability issue in how Chrome and Firefox handle screen coordinates in multi-monitor setups. The solution was a simple adjustment in the click event handler function. The bug fix now allows users with unique multi-monitor layouts to use the website without issues. The ordeal highlighted the unexpected impact monitor setups can have on web experiences.
https://www.joshtumath.uk/posts/2024-11-08-how-a-bbc-navigation-bar-component-broke-depending-on-which-external-monitor-it-was-on/