An Applitools expert on why traditional DOM assertions miss the unknown unknowns that visual AI catches.

Yarden Naveh explains the limits of traditional functional testing based on DOM assertions: you can only test what you thought might break, and passing tests can hide broken user experiences such as CSS colour clashes or overlapping text, the 'unknown unknown'. Applitools Eyes replaces thousands of brittle assertions with a single visual assertion, using AI and machine learning to compare full screenshots as a human eye would, slashing maintenance and improving root cause analysis. The discussion covers accessibility, localization word-wrapping, responsive design and cross-browser rendering via the Ultrafast Grid, which renders one capture across many environments. A hackathon showed Applitools users testing six times faster with 100% issue coverage versus 70%.

**In this episode:**

**Guest:** Yarden Naveh — Customer Success & Solutions, Applitools  

> “The biggest problem that I think exists is what I call the unknown unknown. Tests that are passing, you think that everything is okay, but it actually isn't.”

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