Say Hello to HTML Elementsss

I cant move to next challenge please help me. I've changed <h1>Hello</h1> to <h1>Hello World</h1> but still on same page nothing happens. Thanks for support

1: if your posting something to a challenge change it to the topic. This is about HTML/CSS
2: if you post a code use the `` to do so there is a guide onto how to do this
3: link your challenge you are onto

^+1 You can also use the “Ask for help” button on the challenge. It will make a thread for you and post both the code you have and the link to the challenge (plus some system info that can be useful).

Make sure you are using a supported browser like Chrome or Firefox. Something like Edge will not work well.

Thanks guys I solved my problem. Microsoft edge was problem.