What versions of IE are supported

I’ve spent 10-15 mins searching and can’t find what versions of various browsers (specifically IE) are supported by the plotly JavaScript. I’m seeing it fail in IE9, but d3 supports IE9, so I’d have expected plotly to do so too.

plotly.js should work in IE9 once a type-array polyfill is inserted - see docs here and example jsFiddle here