Try any of the following for the width of the image you want to create −
myImg.setAttribute('width', '5px');
Or
myImg.width = '5';
Or
myImg.style.width = '5px';
You can also try the following code to add the width and height to the background image −
var myImg = new Image(5,5); myImg.src = 'https://www.example.com';