Cant Pass HTML Level 1 "Hello World"

Can anyone please help, so I am stuck at this challenge where I should change the element text from Hello to Hello World but I did it multiple times with and without uppercase and the period I wrote it in every way I possibly can but when I press run test it shows //running test but nothing happens so I can not advance to the next challenge… Can anyone please advise me on what I am doing wrong

My challenge: To pass the test on this challenge, change your h1 element’s text to say “Hello World”.

My Code shows like this so it is correct

<h1>Hello World</h1>

it is one of the easiest ones there are and I can not pass it

Try with a different browser, recommended are Chrome or Firefox