Is it possible to add an image with a javascript code like this or does it have to be a separate list of code? If so, what might work best?

function draw(){
rect(width0.05, height0.8, health, height*0.1);

ya, there are graphics APIs like that. the 2d canvas is similar, except for the “background(200)” thing. what is that meant to do? what exactly is a “list of code” by the way?