function getWindowWidth() {
            return (
              window.innerWidth ||
              (document.documentElement && document.documentElement.clientWidth) ||
              (document.body && document.body.clientWidth) ||
              0
            );
          }
System variable that stores the height of the drawing canvas. This value
is set by the second parameter of the <a href="#/p5/createCanvas">createCanvas()</a> function. For
example, the function call createCanvas(320, 240) sets the height
variable to the value 240. The value of height defaults to 100 if
<a href="#/p5/createCanvas">createCanvas()</a> is not used in a program.

@property {Number} height
@readOnly