browser compatibility

Is there a way to check what browsers is compatible with? I’m trying to get it going on an old MacBook 4 and Chrome version 49. Just trying to figure out if my problems are with the browser or something else.

When I try the first tutorial, changing the h1 element’s text to say “Hello World”, I get the following error in the output and can’t seem to run the tests. I can reset all code.

TypeError: a.querySelectorAll(…).forEach
is not a function