Github user mcgilman commented on the pull request:
https://github.com/apache/incubator-nifi/pull/29#issuecomment-75237020
Those details used to be in the user guide but I don't see it in the
version that was put into 0.0.1. It should go where ever we've documented other
minimum requirements (JVM version, etc).
To answer the question directly, the limiting factor for browsers is SVG
support. IE introduced support for SVG in IE 9.
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