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HTML

              
                <link href='https://fonts.googleapis.com/css?family=Cutive+Mono|Roboto:400,900,700' rel='stylesheet' type='text/css'/>
<p id="focus">Click this window to give it focus (Start typing with a capital S!)</p>
<h1 id="output"></h1>
<div class="target mono" id="target"></div>
<div id="your-attempt" class="mono your-attempt" placeholder="Your text will appear here"></div>
<p class="twitter">Tweet your highest words per minute @ us! <a href="https://twitter.com/EightArmsHQ" target="_blank">https://twitter.com/EightArmsHQ</a></p>
<div class="results">
  <ul class="stats">
    <li>Words per minute <span id="wpm">0</span></li>
    <li>Wordcount <span id="wordcount">0</span></li>
    <li>Timer <span id="timer">0</span></li>
    <li>Errors <span id="errors">0</span></li>
  </ul>
</div>
<hr style="clear:both;" />
<div>
<textarea name="" id="input_text" cols="30" rows="10">Suddenly quite near him there was a rifle shot. He heard the crack and smack and whistling ricochet among the rocks behind him. He dropped his torch and began feebly to trot.</textarea>
</div>
<div class="settings">
  <a href="#" id="reset">Reset</a> | <a href="#" id="change">Change text</a> | <a href="#" id="pause">Pause II</a>
</div>
              
            
!

CSS

              
                $yellow: #2222ff;
$red: #99f;
$white: #fff;

body{
  padding-top:20px;
  font-family:Roboto, sans-serif;
  text-align:center;
  background:#fff;
  color:#222;
  padding-bottom:40px;
  background: url(https://djave.co.uk/hosted/subtlepatterns/lightpaperfibers.png);
}

#focus{
  background:rgba(255,0,0,0.7);
  padding:20px;
  font-weight:bold;
  font-size:30px;
  color:#fff;
}

.mono{
  font-family:"Cutive Mono", monospace;
}

.wrong{
  background:$red;
  color:#fff;
}

hr{
  margin:1em 0;
  max-width:800px;
  border:none;
  border-top:1px solid rgba(255,255,255,0.3);
  margin:0 auto;
}

.results{
  position:fixed;
  top:0;
  left:0;
  right:0;
}

.stats{
  overflow:hidden;
  margin-bottom:1em;
  height:100px;
  list-style:none;
  padding:5px 0;
  font-size:16px;
  font-weight:900;
  max-width:1000px;
  margin:0 auto;
  li{
    width:25%;
    float:left;
  }
}

.target{
  color:#fff;
  text-align:left;
  font-size:32px;
  min-width:300px;
  min-height:40px;
  width:600px;
  display:inline-block;
  position:relative;
  white-space:pre;
  background:#333;
  box-shadow:inset 0 0 10px 0 rgba(255,255,255,0.2);
  padding:22px 10px 10px;
  &:after{
    content: '';
    position: absolute;
    width: 20px;
    height: 2px;
    background: #f00;
    left: 10px;
    top: 53px;
    -webkit-animation:cursor_flash .5s infinite;
    -moz-animation:   cursor_flash .5s infinite;
    -o-animation:     cursor_flash .5s infinite;
    animation:        cursor_flash .5s infinite;
  }
  &:before{
    font-family:Roboto;
    top:0;
    left:0;
    right:0;
    background:#000;
    content:'Type the text below';
    text-transform:uppercase;
    font-size:10px;
    padding:2px;
    text-align:left;
    position:absolute;
    color:#fff;
  }
}


@-webkit-keyframes cursor_flash {
  0%   { background: $white; }
  50%  { background: $red; }
  100% { background: $white; }
}
@-moz-keyframes cursor_flash {
  0%   { background: $white; }
  50%  { background: $red; }
  100% { background: $white; }
}
@-o-keyframes cursor_flash {
  0%   { background: $white; }
  50%  { background: $red; }
  100% { background: $white; }
}
@keyframes cursor_flash {
  0%   { background: $white; }
  50%  { background: $red; }
  100% { background: $white; }
}

.button{
  display:inline-block;
  padding:8px 10px;
  background:#057f24;
  border-radius:2px;
  color:#fff;
}

#textarea{
  position:absolute;
}

.spell{
  font-size:40px;
  font-weight:900;
  letter-spacing:2px;
  span{
    color:$yellow;
  }
}

textarea{
  color:#fff;
  width:60%;
  margin:1em auto;
  display:none;
  position:relative;
  white-space:pre;
  background:#333;
  box-shadow:inset 0 0 10px 0 rgba(255,255,255,0.2);
  border: 1px solid rgba(255,255,255,0.4);
}

.your-attempt{
  background:#222;
  color:#fff;
  padding:10px;
  min-height:100px;
  border:1px solid #555;
  max-width:600px;
  margin:2em auto;
  white-space:pre-wrap;
}

.results{
  font-family:Roboto;
}

.settings{
  position:fixed;
  bottom:0;
  left:0;
  right:0;
  padding:3px 6px 6px;
  background:#444;
  font-family:Roboto, sans-serif;
  color:#999;
  text-align:left;
  text-shadow:0 0 6px rgba(0,0,0,0.6);
  border-top:3px solid #222;
  font-size:12px;
  a{
    color:#fff;
    transition:color 0.2s;
    text-decoration:none;
    &:hover{
      color:#ccf;
    }
  }
}

.twitter a{
  color:rgba(255,0,0,0.7);
  text-decoration:none;
  &:hover{
    text-decoration:underline;
  }
}
              
            
!

JS

              
                /*
 * The animation at the start, made from my previous pen
 * https://codepen.io/EightArmsHQ/pen/HJsav
 */

// The base speed per character
time_setting = 30;
// How much to 'sway' (random * this-many-milliseconds)
random_setting = 100;
// The text to use NB use \n not real life line breaks!
input_text = "How fast can you type?";
// Where to fill up
target_setting = $("#output");
// Launch that function!
type(input_text, target_setting, 0, time_setting, random_setting);

function type(input, target, current, time, random){
  // If the current count is larger than the length of the string, then for goodness sake, stop
	if(current > input.length){
    // Write Complete
		console.log("Complete.");
	}
	else{
	 // console.log(current)
    // Increment the marker
		current += 1;
    // fill the target with a substring, from the 0th character to the current one
		target.text(input.substring(0,current));
    // Wait ...
		setTimeout(function(){
      // do the function again, with the newly incremented marker
			type(input, target, current, time, random);
      // Time it the normal time, plus a random amount of sway
		},time + Math.random()*random);
	}
}

/*
 * The typing test stuff
 */

var character_length = 31;
var index = 0;
var letters =  $("#input_text").val();
var started = false;
var current_string = letters.substring(index, index + character_length);

var wordcount = 0;

$("html, body").click(function(){
  $("#textarea").focus();
});

$("#target").text(current_string);
$(window).keypress(function(evt){
  if(!started){
    start();
    started = true;
  }
  evt = evt || window.event;
  var charCode = evt.which || evt.keyCode;
  var charTyped = String.fromCharCode(charCode);
  if(charTyped == letters.charAt(index)){
    if(charTyped == " "){
      wordcount ++;
      $("#wordcount").text(wordcount);
    }
    index ++;
    current_string = letters.substring(index, index + character_length);
    $("#target").text(current_string);
    $("#your-attempt").append(charTyped);
    if(index == letters.length){
      wordcount ++;
      $("#wordcount").text(wordcount);
      $("#timer").text(timer);
      if(timer == 0){
        timer = 1;
      }
      wpm = Math.round(wordcount / (timer / 60));
      $("#wpm").text(wpm);
      stop();
      finished();
    }
  }else{
    $("#your-attempt").append("<span class='wrong'>" + charTyped + "</span>");
    errors ++;
    $("#errors").text(errors);
  }
});

var timer = 0;
var wpm = 0;
var errors = 0;
var interval_timer;

$("#reset").click(function(){
  reset();
});

$("#change").click(function(){
  $("#input_text").show().focus();
});

$("#pause").click(function(){
  stop();
});

$("#input_text").change(function(){
  reset();
});

function start(){
  interval_timer = setInterval(function(){
    timer ++;
    $("#timer").text(timer);
    wpm = Math.round(wordcount / (timer / 60));
    $("#wpm").text(wpm);
  }, 1000)
}

function stop(){
  clearInterval(interval_timer);
  started = false;
}

function reset(){
  $("#input_text").blur().hide();;
  $("#your-attempt").text("");
  index = 0;
  errors = 0;
  clearInterval(interval_timer);
  started = false;
  letters = $("#input_text").val();
  $("#wpm").text("0");
  $("#timer").text("0");
  $("#wordcount").text("0");
  timer = 0;
  wpm = 0;
  current_string = letters.substring(index, index + character_length);
  $("#target").text(current_string);
}

function finished(){
  alert("Congratulations!\nWords per minute: " + wpm + "\nWordcount: " + wordcount + "\nErrors:" + errors);
}

var window_focus;

$(window).focus(function() {
    window_focus = true;
}).blur(function() {
  window_focus = false;
});

$(document).ready(function(){
  if(window_focus){
    $("#focus").hide();
  }
  $(window).focus(function() {
    $("#focus").hide();
  });
});
              
            
!
999px

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