Don't think source is available for this, but if I'm not mistaken you can see webworkers being used on the https://preactjs.com/ https://preactjs.com/ website.

Don't think source is available for this, but if I'm not mistaken you can see webworkers being used on the https://preactjs.com/ https://preactjs.com/ website. It uses webworkers in the repl examples and the source of the site is online (https://github.com/developit/preact-www/blob/master/src/components/controllers/repl/runner.js https://github.com/developit/preact-www/blob/master/src/comp...)