Ignoring diffs

A powerful feature in the Happo review process is the ability to always ignore a diff. To use this feature, select "Always ignore this diff" from the dropdown next to any diff.

Ignoring a diff will instruct Happo to ignore that specific diff now and in the future. It should be used with a little bit of caution as it might hide issues that should be caught.

Examples of where it is okay to mark a diff as always ignored:

• ✅ When there's a subtle diff that you can't attribute to the changes made.
• ✅ When there are flaky rendering-related issues not caused by your code.

Examples of where you should avoid marking a diff as always ignored:

• ❌ You've made a UI update causing diffs (simply accept the report instead).
• ❌ You're having spurious diffs where some images/fonts won't load (reach out to us instead — this might be a bug).

Global effect

Ignored diffs apply to all future and past Happo reports. This can lead to some confusion when your Happo build status (in e.g. GitHub) shows a number of diffs, but the Happo report page shows fewer diffs (or even none). Build statuses aren't updated when you ignore a diff, you still need to manually approve or reject.