Front End Observability: Why Your window.onerror Reports Say "Script error." (and How to Fix Them)

<p><em>A practical guide to browser error monitoring with window.onerror, covering the cross-origin blind spot, resource failures that never bubble, and error reports that die when the tab closes. Includes tests and Angular wiring.</em></p> <p>It's late on a Friday. Support forwards a screenshot: a customer's checkout page is blank. You open your error dashboard, and there it is, forty times since

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