blur
Specifies the blur distance of the tooltip's shadow.
The larger the value assigned to this option, the blurrier the shadow's edge.
color
Specifies the color of the tooltip's shadow.
This option supports the following colors.
- Hexadecimal colors
- RGB colors
- RGBA colors (not supported in Internet Explorer 8)
- Predefined/cross-browser color names
- Predefined SVG colors (not supported in Internet Explorer 8)
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