FCC run test not working

Tell us what’s happening:
Hi , My basic JavaScript isn’t running the tests for each challenge! The run test button isn’t working. I tried restarting and making a new account it still didn’t work! I am guessing it’s a problem to all users. Can you fix this glitch would be gladly appreciated! thanks

Your code so far

// Only change code below this line

var myStr;

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 Edge/18.18362.

Challenge: Concatenating Strings with the Plus Equals Operator

Link to the challenge:

It happened me a couple times, but it happened when internet was fallen. Maybe you had a problem with internet too.

It’s still not working I tried restarting my internet and it didn’t still work the html and css worked perfectly.

The tests seem to be working fine for me. It looks like you are using an old version of Microsoft Edge. I recommend updating to the latest version which runs on Chromium.

ok on my chrome it didn’t work so I tried Microsoft Edge. But I will update them and see if it will work thanks