htr3n commented on issue #16127:
URL: https://github.com/apache/echarts/issues/16127#issuecomment-995304513


   @pissang @plainheart Regarding the nightly build that you recommended, I've 
noticed a strange issue. I tried to load the legend icons as dataURI per 
documentation here: https://echarts.apache.org/en/option.html#legend.data.icon.
   
   ```javascript
       legend: {
           show: true,
           data: [
               {
                   name: 'LegendIcon',
                   icon: 'image://data:image/svg+xml;base64,PHN2ZyB4bWxuc....'
               }
           ]
       }
   ```
   
   The React UI can render successfully the icon but the new server-side 
rendering implementation `renderToSVGString()` raised an error: 
`ReferenceError: HTMLImageElement is not defined`. It seems it could not load 
the `dataURI`?


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