What is acceptance testing?

Acceptance testing confirms that a feature works for a real user in realistic conditions, usually after automated tests and deployment have passed.

Do browser checks change real data?

Most checks are read-only. When a change is needed, test records and reversible actions are used, and real purchases or messages require separate approval.

Why use a separate test account?

A dedicated account keeps checks repeatable, keeps personal accounts out of test activity and makes test actions easy to identify.

#Design Systems

How We Build Software

Motion With Respect: Supporting Reduced Motion

Animations can make a website feel alive, and they can make some people feel unwell. Here is how we design motion that respects the reduced motion set...

Sharon C Dec 16, 2025

4 min read

How We Build Software

Why We Self-Host Every Font on Our Websites

Our websites load their fonts from our own servers, not from a public font service. Here is how that choice helps privacy, reliability and page speed.

Sharon C Dec 10, 2025

4 min read

How We Build Software

Signed-In Browser Checks Before We Call a Feature Accepted

Passing tests and a successful release are not the same as a feature working for a person. Here is how signed-in browser checks give us that final evi...

Sharon C Nov 21, 2025

4 min read