blur
Specifies the blur distance of a tooltip's shadow. The larger the value, the blurrier the shadow's edge.
                        Type:
                    
                
                    Default Value: 2
                
        color
Colors a tooltip's shadow.
                        Type:
                    
                
                    Default Value: #000000
                
        This option supports the following colors:
- Hexadecimal colors
 - RGB colors
 - RGBA colors
 - Predefined/cross-browser color names
 - Predefined SVG colors
 - Paint server address
 
offsetX
Specifies the horizontal offset of a tooltip's shadow relative to the tooltip itself. Measured in pixels.
                        Type:
                    
                
                    Default Value: 0
                
        offsetY
Specifies the vertical offset of a tooltip's shadow relative to the tooltip itself. Measured in pixels.
                        Type:
                    
                
                    Default Value: 4
                
        opacity
Specifies the transparency of a tooltip's shadow.
                        Type:
                    
                
                    Default Value: 0.4
                
        This option accepts a value from 0 to 1, where 0 makes the shadow completely transparent, and 1 makes it opaque.
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