#Google Chrome

2 posts

You Waited Minus 98 Milliseconds

Google's web-vitals was reporting that users waited a negative amount of time for their clicks to be handled — and the three numbers still added up perfectly, which is exactly why nobody had noticed. Finding it, proving it when automated tests physically couldn't, and the exchange where a maintainer's simpler fix turned out not to work.

Aug 27, 20267 min

The One-Line "Cleanup" That Quietly Broke CLS for Everyone

Google Chrome web-vitals

Google Chrome

The One-Line "Cleanup" That Quietly Broke CLS for Everyone

Two arrow functions were deleted to shave bytes off a bundle. Each was safe alone; together they made Google's web-vitals send analytics a fake CLS of 0 every time a visitor pressed Back. Finding it, proving it against a test suite that said everything was fine, and getting the one-line fix merged into v6.2.0.

Aug 26, 202612 min