Img tag not showing the image

I’m creating a page with just html css and vainilla javascript,
I add an image <img src="marco.png"/> but it doesn’t load.
But if I go to the image shows up. So I don’t get why the img tag doesn’t work.
This happens to every image in my page.
Any idea why is this happing? Has anyone faced a similar problem?

What’s interesting here is that works - notice the trailing slash. What is gifparty here - is it a folder name? Ca you share a screenshot of your folder structure?

John B