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Well it's ansi text, so why not just copy the text directly to a DIV, convert the ansi to html (or css) and update it via javascript polling ?

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You would have to parse the VT-100 escape codes to generate the correct html + css (e.g. colors and cursor relocation escape sequences). It is not that straight forward, but on the other hand there are libraries for that.

http://www.pixelbeat.org/scripts/ansi2html.sh

Or maybe just use WebRTC or WebSockets for push state change ?

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