How do I use the img tag on the HTML Element plugin?

I have a png image on my Files folder and I would like to use an instance of HTML Element to display it using the img tag. I'm trying using <img src:"myImage.png" width:"20" height:"20"/> as the content of the HTML Element but it doesn't work. I've also tried many variations for the src attribute, such as /myImage.png, Files/myImage.png and /Files/myImage.png, but nothing works.