Is cross browser support expected?

I was looking through this project and noticed that currently the guidepup tests are only running in the Edge browser. Is it expected that the guidepup tests should run in Chrome, Safari, and Firefox as well?

https://github.com/github/arianotify-polyfill/blob/96826bf288d914b7bbaad9d8aa79f50397793f6a/playwright.config.mjs#L12