Ovilia commented on issue #9014: 使用Safari在svg渲染模式下,rgba渐变的透明度值失效
URL: 
https://github.com/apache/incubator-echarts/issues/9014#issuecomment-418958094
 
 
   This is a safari bug since `color-opacity` defined in [W3C 
spec](https://www.w3.org/TR/SVG2/pservers.html#StopOpacityProperty) is:
   > The opacity value used for the gradient calculation is the product of the 
value of stop-opacity and the opacity of the value of stop-color
   
   Maybe we can provide ad hoc for it.
   
   See 
https://stackoverflow.com/questions/11303740/svg-linear-gradient-doesnt-work-in-safari/11310511
 for more information.

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