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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Start by making the capture repeatable, not by hiding pixels. Happo says it automatically silences animations and waits for asynchronous assets and fonts. For remaining small rendering noise, use color-delta tolerance; for a genuinely irrelevant region, use Happo’s supported ignored-diff workflow selectively. Avoid guessing at a DOM attribute or configuration syntax that Happo’s documentation does not establish.
Identify what is changing before ignoring it
Re-run the comparison and inspect whether the changing area comes from animation, loading, fonts or assets, external requests, or a meaningful application state. The right fix depends on the cause: stabilization addresses timing, deterministic setup addresses state, tolerance addresses minor pixel noise, and ignored diffs suppress a particular difference.
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- Animation or loading: begin with Happo’s automatic animation silencing and waiting behavior.
- Application state: make the fixture or interaction repeatable so each capture reaches the same state.
- Minor pixel noise: consider color-delta tolerance.
- External resources: identify which requests vary before deciding whether to control them.
- A region that should not affect review: consider an ignored diff, with a narrow scope and a documented reason.
Stabilize animations, assets, and application state
Use Happo’s built-in stabilization first
Happo says it automatically silences animations and waits for asynchronous assets and fonts. These measures can resolve differences caused by captures landing at different points in an animation or before content has finished loading. See Happo’s documentation for the current behavior and integration-specific details.
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Drive stateful UI to a known state
If a widget changes because of interaction or app data, make the setup deterministic rather than excluding its pixels. Happo’s Storybook integration describes using interaction tests to reach states such as loading, error, hover, or an open menu before capture. Happo also provides Cypress and Playwright integrations; use the setup appropriate to your project and ensure the capture follows the same steps and data each run. See Happo’s Storybook integration, Cypress integration, and Playwright integration.
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Use color-delta tolerance for small pixel noise
Happo describes color-delta tolerance as a way to treat small differences—such as image compression noise or anti-aliasing—as noise. It is a pixel-difference threshold, not a rule for identifying or ignoring a particular dynamic DOM element. Consult Happo’s current configuration documentation for the supported setting and syntax for your integration; do not copy an unverified option name.
Ignore a diff only when suppression is intentional
Happo’s API reference lists operations to create and delete ignored diffs: POST and DELETE on /api/ignored-diffs. Treat this as a review decision: an ignored diff can hide a real regression along with unwanted movement. Keep the exclusion as narrow as the supported workflow allows, record why it exists, and revisit it when the underlying UI changes.
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The API reference includes an optional dataHappoHide Boolean in ignored-diff details, but that field alone does not establish the exact markup or DOM usage. Do not infer an HTML attribute recipe from its name; verify the current integration documentation before using it.
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Happo’s API exposes a flake listing with filters including project, component, variant, target, and SHA. Use recurring failures to determine whether a pattern points to animation, data, asset loading, or an outside request before choosing a remedy. See Happo’s API reference for the endpoint and available filters.
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In a blog post dated September 23, 2026, Happo announced hostname allow/block-list controls for snapshot requests. The post said the feature was off by default at publication and that requests to unallowed hosts do not leave the worker. Check the current package documentation for syntax, defaults, and availability before relying on it. Happo also reported that one customer reduced flaky examples from about 2,000 to about 20; that is a company-reported result for one customer, not a typical or independently verified outcome. See Happo’s announcement.
Troubleshooting: choose the remedy that matches the symptom
| Symptom | Likely cause to check | Next step |
|---|---|---|
| Differences move or change shape between captures | Animation or asynchronous rendering | Confirm Happo’s stabilization applies to the capture; make the interaction and state repeatable. |
| Only fine edges or compressed images differ | Anti-aliasing or compression noise | Try color-delta tolerance; do not use it as a substitute for excluding a specific element. |
| A menu, error, hover, or loading state is inconsistent | The test does not establish the same state each time | Drive the UI through a deterministic Storybook interaction test or equivalent Cypress/Playwright setup. |
| Failures recur around content loaded from another host | An external request may return variable content or fail | Inspect flaky examples and requests; check current Happo package documentation for hostname controls before configuring them. |
| An ignored-diff setting or hide attribute is unclear | The API field name is not enough to establish integration syntax | Use documented ignored-diff operations and verify the current integration docs; do not invent DOM markup. |
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Example cURL request (replace the URL with the page to capture):
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