How does visual testing differ from functional testing?
Visual testing checks how the interface looks. Functional testing checks how the interface works.
The core difference
| Approach | What it checks | Main question |
|---|---|---|
| Visual (screenshot) | appearance: layout, colors, sizes, element positioning | "Does the interface look correct?" |
| Functional | behavior and logic: clicks, input, transitions, results of actions | "Does the interface work correctly?" |
What visual testing catches
- shifted spacing
- broken responsiveness
- wrong fonts or colors
- a disappeared element
- visual artifacts after CSS edits
Goal: capture the appearance and track unintended changes.
What functional testing catches
- whether the button works
- whether the form is submitted
- whether a click triggers navigation
- whether the result of an action is correct
Goal: make sure user scenarios execute as intended.
The bottom line
- Visual testing protects the design.
- Functional testing protects the logic.
They solve different problems, and in UI projects they are often used together to cover both appearance and behavior.
Short Answer
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