The Hidden Testing Gap That Sends Visual Bugs to Production

Most development teams rely exclusively on functional testing—verifying that buttons work and APIs return correct data—while completely neglecting visual testing that ensures the UI appears correctly. This blind spot allows visual bugs caused by CSS changes, library updates, and responsive design failures to slip into production, even when functional tests pass. Visual and functional testing are complementary, not interchangeable; ignoring visual testing leaves your application vulnerable to user-facing issues that directly impact customer experience.