Lisianthus-A opened a new issue #16044:
URL: https://github.com/apache/echarts/issues/16044
### What problem does this feature solve?
In some websites, the color theme is controlled by CSS variables. However,
echarts does not support CSS variables, which means we need to do some work on
CSS variables before using them, like this:
``` js
// get the CSS variable's value
const elementStyle = getComputedStyle(element);
const color = elementStyle.getPropertyValue('--color');
// echarts option
const option = {
color: [color],
// ...
};
```
### What does the proposed API look like?
``` js
// echarts option
const option = {
color: ['var(--color1)', 'var(--color2)'],
// ...
};
```
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