warpdom

About

warpdom is a DOM environment for unit and component tests, written from the WHATWG specifications as a drop-in replacement for jsdom in Vitest and Jest. Its authors report matching jsdom test results on 23 open-source suites apart from flaky tests and a short list of explained differences, and a median speedup of about 1.27x on the suites they tuned on. A compare command lets you check this on your own suite. It is marked pre-release.