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Very nice. Do you know how they achieve the 1-pixel lines on the chart? I'm supposing they use SVG, like RaphaelJS. This was a little PITA for me in RaphaelJS.

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Highcharts uses SVG and reverts to UML for older versions of IE.

you mean VML, the other vector markup language: http://en.wikipedia.org/wiki/Vector_Markup_Language

AFAIK, They use SVG also.

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