I fixed a couple of errors on the earthquake site tertremo. One that was preventing anything from actually showing up on the map. Not good.

SCRIPT5009 symbol is undefined

SCRIPT5009: 'Symbol' is undefined
app-cf8939a002a809783599bc1d2aaf0760.js (1,20869)

This one was pretty easy to figure out once I loaded it up on the development server so that the error wasn’t being attributed to some random minified javascript code. Apparently IE11 doesn’t like ES6 code and I needed to add the babel-polyfill to make it happy (see link for instructions). And now Internet Explorer 11 properly shows earthquakes on the map. Yay!

HTML1506 unexpected token

Less serious was this error which didn’t appear to be affecting the functionality of the site:

HTML1506: Unexpected token.
www.tertremo.com (41,3)

This was easy enough to fix too, once I knew the cause. I had put my google analytics JS code after the ending </body>. Woops.