crbug/1173575, non-JS module files deprecated
I was writing up some basic HTML code and some CSS too. I ran the CSS by mistake rather than running the HTML file and suddenly I got the error showing localhost:8080 and the debug console started showing me this too.
crbug/1173575, non-JS module files deprecated.
Solution 1:
You didn't mention it but if a .vscode folder popped up with a launch.json file then I think I would know the solution. I'm not sure if this would work for everyone, but I just deleted that .vscode folder and ran the html file again and it worked.