I'm not sure. I haven't looked into the issue much.

In any case, I would expect web-sockets to work out out the box in a language that is specifically designed to run in the browser.

If that's not working I'm sure that less common parts of the web platform aren't supported either. Normally I wouldn't care and implement stuff myself and contribute back, but it doesn't seem to be a realistic option in Elm.

I appreciate that what's there is generally of very high quality, but I cannot pretend that there aren't many missing pieces and, more importantly, no clear roadmap