Common E2E Test Blind Spots: File Uploads, Focus Management, and Container Queries

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Most end-to-end test suites validate only the straightforward path of a user workflow, missing failure points that real users frequently encounter. Critical gaps include file upload tests that stop at input assignment rather than verifying the file reaches the correct backend record after full submission. Keyboard focus flows — such as modals that trap focus incorrectly or shortcuts that misfire during text input — are largely invisible to mouse-based testing. Responsive layout coverage often relies on fixed viewport sizes, which can miss bugs triggered by CSS container queries that alter component layout based on parent-element width rather than the browser window. Addressing these under-tested areas requires extending assertions beyond the initial browser action to cover the complete interaction lifecycle.

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