Say Hello to HTML Elements not able to run tests

Tell us what’s happening:
every time I finish a challenge and hit run tests to move on to the next challenge it says at the bottom “running tests” but nothing ever happens. I’m wondering how I can fix this

Your code so far

<h1>"Hello World".</h1>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 Edge/16.16299.

Link to the challenge:

It might be a browser issue. Your code works on my browser (FireFox). Try clearing your cache.
I was able to get

// running test

// tests completed

Write the text inside the h1 without inverted commas(" ").