window.CanvasGradient
See: Web APIs - CanvasGradient for more details
Also, refer to the interface HTMLCanvasElement
Since: v7.0.0  
addColorStop(offset, colorValue)
Adds a new color stop, defined by an offset and a color value, to a given canvas gradient.
Throws:
- DOMException
See: CanvasGradient - addColorStop for more details
| Param | Type | Description | 
|---|---|---|
| offset | number | A number between 0 and 1, inclusive, representing the position of the color stop. 0 represents the start of the gradient and 1 represents the end. | 
| colorValue | string | A CSS  <color>value representing the color of the stop. |