How can a canvas be given color attribute

Answer 1

or ctx.strokeStyle=color in case you want to change line color

Answer 2

color or background color?
For background color, do this in css:
canvas{
background-color:red;
}

Answer 3

ctx.fillStyle=color

Answer 4

You can draw a rectangle in the color you want.

context.fillRect(0,0,canvas.width,canvas.height);

Answer 5

fill=color

Answer 6

please where should I insert the fill