index.js
function getBackgroundSize(image) {
	var x = image.properties.width / image.ratio;
	var y = image.properties.height / image.ratio;
	var template = _.template('<%= x %>px <%= y %>px');

	return template({x: x, y: y});
}
function getBackgroundSize(image) {
	var x = image.properties.width / image.ratio;
	var y = image.properties.height / image.ratio;
	var template = _.template('<%= x %>px <%= y %>px');

	return template({x: x, y: y});
}
function getBackgroundSize ( image ) { var x = image . properties . width / image . ratio ; var y = image . properties . height / image . ratio ; var template = _ . template ( '<%= x %>px <%= y %>px' ) ; return template ( { x : x , y : y } ) ; }
Return the value for background-size property.
Return the value for background - size property .