"No response from web browser"

I’m having an issue with building a website from scratch module. As I attempt to complete each step, my answers are being marked wrong upon arrival and the only way for me to proceed is to click “run” until the code is given to me. I double check the code that is given and it’s the exact same as the code that I typed and on the bottom of the coding space there is a message saying “no response from web browser” but I can see the work that I’m doing. Is there anybody else who had this problem and what did you do to dix it?

I don’t know how to fix this but I have the same issue! My internet is plenty fast and other web pages are operating fine but this error continues to be an issue as I work through the material.

switched from firefox to chrome and have run into the error again but less often