Running the web Example in browser I get fetch errors?

[DanielJackson-Oslo]

Thank you for a really promising package! I love the idea behind this!

Steps to reproduce my error:

• Clone repository
• Navigate to exmaples/web
• yarn install && yarn start
• Navigate to http://localhost:8080/

Greeted with blank screen and the following in console:

Error retrieving ID TypeError: Failed to execute 'fetch' on 'Window': Illegal invocation
    at Api.retrieveId (Api.js:31)
    at new Signaler (Signaler.js:76)
    at new ConnectionManager (ConnectionManager.js:12)
    at main (index.js:9)
    at eval (index.js:41)
    at Module../src/index.js (main.js:907)
    at __webpack_require__ (main.js:20)
    at eval (webpack:///multi_(:8080/webpack)-dev-server/client?:2:18)
    at Object.0 (main.js:918)
    at __webpack_require__ (main.js:20)

Got it to work on node, though!

Any idea what might be up?