New on the web platform in May, 2021

CLS no longer penalizes long-running sessions with unlimited cumulations

Declarative Shadow DOM. And easily polyfillable

Faster number crunching if you need to crunch numbers

New timing for page experience ranking

Every web page can be a desktop app

HTML sanitization as a platform primitive

Chrome continues to catch up on back-forward cache

The IE11 death march continues

No excuses

Fix committed but unclear if shipping

Woke: FCP in Safari
Broke: Not actually reporting paint time