The Tool Desk
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Choose a fix that matches what the test should prove
Dynamic text or data can change a screenshot without indicating a layout regression. Percy’s examples include timestamps, personalized content, randomized listings, dashboard metrics, and real-time counters. The important distinction is whether the component’s geometry is part of the visual behavior under test.
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| Approach | Does content stay visible? | Does the test retain layout validation? | Best fit |
|---|---|---|---|
| Deterministic fixtures or mocked responses | Yes | Generally yes | Changing API data when component spacing and alignment matter |
| Hide content or ignore a targeted region | Hidden content does not; masking behavior depends on implementation | Only if the region’s geometry is outside the test’s purpose | Irrelevant, unpredictable content |
| Disable motion and wait for stability | Usually | Yes | Transitions, carousels, spinners, or other timing-sensitive states |
| Loosen comparison sensitivity | Yes | Potentially weakens detection | Small, understood rendering noise after other controls |
Percy’s guidance recommends keeping populated components visible when their layout matters, and warns that hiding an element is appropriate only when its layout is not critical. Broad tolerance can conceal genuine defects, so stabilize the source of variation before considering it.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsStabilize data when the component itself is under test
For a dashboard or other API-driven page, make the test return repeatable data through a fixture or mocked API response. The component remains populated, allowing Percy to compare spacing, alignment, and styling instead of unrelated live values. Keep the fixture consistent across runs and ensure it exercises the state the test is intended to cover.
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This is preferable to hiding a whole card or container when its dimensions, placement, or surrounding layout are assertions. If only one value is irrelevant, isolate that value rather than suppressing a larger region.
Hide or ignore only content outside the assertion
A changing timestamp, personalized greeting, live counter, ad, or notification may be a candidate for targeted suppression if the test does not cover it. Avoid suppressing a parent container if its size, position, or interaction matters: doing so can make a real visual regression disappear from the comparison.
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Percy announced an “Ignore Regions” feature on October 26, 2022, as a way to address flakiness from dynamic data (Percy changelog announcement). Percy’s February 23, 2026 guide also discusses reducing false positives (Percy’s guide to reducing false positives).
Do not copy an unverified ignore-region code snippet: the exact option name, selector format, supported integration, and package-version requirements depend on the SDK, and current syntax is not established here. Check the official reference for the particular integration and installed version before configuring an ignore region. Confirm in a test that the chosen behavior masks or excludes the intended pixels and does not undermine layout checks.
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Stop motion and wait for a stable capture state
Animations, transitions, carousels, and autoplay media can produce different frames depending on capture timing, buffering, or network behavior. Disable or pause motion in the test environment where practical, and wait for the intended state before taking a snapshot. A stable, explicit state is more reliable than relying on a delay that may be too short on a slow run or unnecessarily long on a fast one.
Percy changelog material also describes Percy-specific CSS that can be supplied at snapshot or global SDK configuration level, including an iframe-hiding example. Treat that as historical feature evidence rather than a guarantee that a particular syntax works in every current SDK; verify current support before using it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Apply the changes in this order
- Define the assertion: decide whether the changing element’s content, geometry, or neither is relevant to this comparison.
- Stabilize relevant content: use repeatable fixtures or mocked responses when the populated component’s layout must remain testable.
- Suppress only irrelevant variation: target the smallest region that can be ignored without removing geometry or behavior the test needs to validate.
- Control timing: disable or pause motion and wait for the required page state before capture.
- Review the resulting comparison: confirm the change removes noise without hiding a meaningful difference; avoid broad sensitivity changes that could mask defects.
Troubleshoot recurring Percy diffs
- Text or metrics change while alignment looks stable: replace live data with a fixture if the component layout matters; otherwise consider a narrowly targeted ignore or hide behavior.
- A whole card or section stops appearing in useful comparisons: the suppression target is probably too broad. Restore the container and isolate only the irrelevant content.
- The diff varies from run to run despite stable data: look for animations, transitions, autoplay content, loading states, or capture timing, then make the state deterministic before snapshotting.
- An ignore-region example does not work: verify the current API and selector syntax against documentation for the exact Percy integration and installed package version; do not assume historical changelog examples are current SDK instructions.
- A threshold change clears noise but misses meaningful changes: revert or narrow the tolerance and stabilize the page at its source instead.
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