<input>
$("input").keydown(function(){
  $("input").css("background-color", "red");
});
$("input").keyup(function(){
  $("input").css("background-color", "yellow");
});

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. //cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js