It is hard to predict how long the legend of the RadHtmlChart will be as this is a custom decision. Therefore long legend has been cut in most browsers, except IE where it just overflows the PlotArea. I have logged this as bug in our feedback portal here
, so that you can monitor, comment or vote on its progress.
I have also updated your Telerik points for reporting this issue.
For the time being you can simply hide the legend of you current chart and create a custom one in a styled div after/next to the chart. You can follow the approach that Kendo UI are applying in their Bubble chart example here
All the best,
the Telerik team
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