Help this noob out plz, heading tag not working


I am new to coding and I think its a stupid question but I really don’t know what’s the error here. Basically, I just downloaded Atom one hour ago and trying to get used it now by following an instruction. However, as the instruction shows, the tag should work, but when I tried to imitate it and I got exactly what I typed on editor shows on the page, which means the tag is not working here(like picture attached below)!. I don’t think I changed anything of setting so I really appreciate anyone here can help a noob like me out here. Thanks again!


Sorry ’ ’ its what i just tried, the instruction shows the heading tag should be


which I have tried also, not working either, like pic showed below


Save the file as test.html then open that file with a web browser as you have done.


works! thanks so much