plainheart commented on issue #21504:
URL: https://github.com/apache/echarts/issues/21504#issuecomment-3823209613
This is a known behavior("issue"), but it was intentionally designed this
way from the outset — likely for performance reasons, the background box will
not be rendered if no explicit backgroundColor is specified.
As a workaround, you can explicitly set a transparent color (e.g.,
`'transparent'` or `'rgba(0,0,0,0)'`).
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