D3
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Old school D3 from simpler times
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mbostock
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<!DOCTYPE html> <input> <script src="//d3js.org/d3.v3.min.js"></script> <script> window.focus(); d3.select(window).on("keydown", function() { d3.select("input").property("value", d3.event.keyCode); }); </script>
https://d3js.org/d3.v3.min.js