vv-lin opened a new issue #10524: 【功能建议】建议ECharts图例和悬停提示支撑部分html内容，在某些专业领域对此很注重。 URL: https://github.com/apache/incubator-echarts/issues/10524 ### What problem does this feature solve? 建议ECharts图例和悬停提示只是部分html内容，<b>在某些专业领域对此很注重。</b><br><br> 比如：<br><br> 空气质量的PM<sub>2.5</sub>中的“2.5”就是下标。<br><br> 化学里面的离子Na<sup> </sup>中的“ ”就是上标。<br><br> 长度单位m<sup>2</sup>中的“2”是上标。<br><br> ### What does the proposed API look like? <xmp> legend: { data:['PM<sub>2.5</sub>','Na<sup> </sup>','M<sup>2</sup>'] } </xmp> <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE -->
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