<script src="js/grid.js"></script>

<script>
    const predefined_grid = [];
	const options = {
		"unit" : '%', // % px
		"width" : "100%",
		"columns" : 12,
		"gutter" : 1, // based on unit
		"random" : false,
		"divider" : 1, // if random = true : random division by multiple
		"predefined" : predefined_grid,
	}
	grid.init(options);
</script>

[unit] : string 
Set unit value. Ex : '%' or 'px' 

[width] : string 
Set container width. Ex : '100%' or '1920px'

[columns] : number
Total columns length. Ex : 12  

[gutter] : number
Gutter width. Ex : 1

[random] : boolean
If enabled, grid will be generated randomly by specified divider.  Ex : 'false' 

[divider] : number
Value use when generated random grid. Each grid position will be a multiple of this value. Ex : 5 

[predefined] : array
Used to generate a grid based on predefined values : [ [leftPosition, width], [leftPosition, width], ...]
Ex : [ [2%, 10%], [13%, 20%], ...] 

NB : When you generate a new random or classic grid :
Check the console and copy grid data. 
Then just pass the new array to predefined array.