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HTML

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HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

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About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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Insecure Resource

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CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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Packages

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Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Speed Test</title>
    <script src="script.js" async></script>
    <link rel="stylesheet" href="//fonts.googleapis.com/css?family=Source+Sans+Pro:400,400i,700,700i,900,900i" type="text/css" media="all">
    <link rel="stylesheet" href="style.css">
</head>

<body>
    <header class="masthead">
        <h1>Test Your Typing Speed</h1>
    </header>
    <main class="main">
        <article class="intro">
            <p>DO IT. DO IT NOW.</p>
        </article><!-- .intro -->
        <section class="test-area">
            <div id="origin-text">
  <p>Why do they call me Mr. Happy?</p>
            </div><!-- #origin-text -->

            <div class="test-wrapper">
                <textarea id="test-area" name="textarea" rows="6" placeholder="The clock starts when you start typing."></textarea>
            </div><!-- .test-wrapper -->

            <div class="meta">
                <section id="clock">
                    <div class="timer">00:00:00</div>
                </section>

                <button id="reset">Start over</button>
            </div><!-- .meta -->
        </section><!-- .test-area -->
    </main>

</body>
!

CSS 

              
                body,
button,
input,
select,
textarea {
	font-family: 'Source Sans Pro', 'Helvetica', Arial, sans-serif;
	font-size: 18px;
	line-height: 1.5;
}

h1,
h2,
h3,
h4,
h5,
h6 {
	clear: both;
}

p {
	margin-bottom: 1.5em;
}

b,
strong {
	font-weight: bold;
}

dfn,
cite,
em,
i {
	font-style: italic;
}

blockquote {
	margin: 0 1.5em;
}

address {
	margin: 0 0 1.5em;
}

pre {
	background: #eee;
	font-family: "Courier 10 Pitch", Courier, monospace;
	font-size: 15px;
	font-size: 1.5rem;
	line-height: 1.6;
	margin-bottom: 1.6em;
	max-width: 100%;
	overflow: auto;
	padding: 1.6em;
}

code,
kbd,
tt,
var {
	font: 15px Monaco, Consolas, "Andale Mono", "DejaVu Sans Mono", monospace;
}

abbr,
acronym {
	border-bottom: 1px dotted #666;
	cursor: help;
}

mark,
ins {
	background: #fff9c0;
	text-decoration: none;
}

sup,
sub {
	font-size: 75%;
	height: 0;
	line-height: 0;
	position: relative;
	vertical-align: baseline;
}

sup {
	bottom: 1ex;
}

sub {
	top: .5ex;
}

small {
	font-size: 75%;
}

big {
	font-size: 125%;
}

/*--------------------------------------------------------------
Layout
--------------------------------------------------------------*/
body {
    margin: 0;
    padding: 0;
}

.masthead {
    padding: 1em 2em;
    background-color: #0D1B2E;
    color: white;
}

.masthead h1 {
    text-align: center;
}

.intro {
    padding: 2em 2em;
    color: #ffffff;
    background: #429890;
}


.intro p,
.test-area {
    margin: 0 auto;
    max-width: 550px;
}

.test-area {
    margin-bottom: 4em;
    padding: 0 2em;
}

.test-wrapper {
    border: 10px solid grey;
    border-radius: 10px;
}

#origin-text {
    margin: 1em 0;
    padding: 1em 1em 0;
    background-color: #ededed;
}

#origin-text p {
    margin: 0;
    padding-bottom: 1em;
}

.test-wrapper {
    display: flex;
}

.test-wrapper textarea {
    flex: 1;
}

.meta {
    margin-top: 1em;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.timer {
    font-size: 3em;
    font-weight: bold;
}

#reset {
    padding: .5em 1em;
    font-size: 1.2em;
    font-weight: bold;
    color: #E95D0F;
    background: white ;
    border: 10px solid #E95D0F;
}

#reset:hover {
    color: white;
    background-color: #E95D0F;
}
!

JS 

              
                const testWrapper = document.querySelector(".test-wrapper");
const testArea = document.querySelector("#test-area");
const originText = document.querySelector("#origin-text p").innerHTML;
const resetButton = document.querySelector("#reset");
const theTimer = document.querySelector(".timer");


var timer = [0,0,0,0];
var interval;
var timerRunning = false;

// Add leading zero to numbers 9 or below (purely for aesthetics):
function leadingZero(time) {
    
    if (time <= 9) {
        
        time = "0" + time;
    }
    
    return time;
}

// Run a standard minute/second/hundredths timer:
function runTimer() {
    
    let currentTime = leadingZero(timer[0]) + ":" + leadingZero(timer[1]) + ":" + leadingZero(timer[2]);
    
    theTimer.innerHTML = currentTime;
    timer[3]++;
    
    timer[0] = Math.floor((timer[3]/100)/60);
    timer[1] = Math.floor((timer[3]/100) - (timer[0] * 60));
    timer[2] = Math.floor(timer[3] - (timer[1] * 100) - (timer[0] * 6000));
}

// Match the text entered with the provided text on the page:
function spellCheck() {
    
    let textEntered = testArea.value;
    let originTextMatch = originText.substring(0, textEntered.length);
    
    if(textEntered == originText) {
        
        clearInterval(interval);
        
        testWrapper.style.borderColor = "#339900";
        
    } else {
        
        if(textEntered  == originTextMatch) {
            
            testWrapper.style.borderColor = "#E55400";
        } else {
            
            testWrapper.style.borderColor = "#FF0000";
        }
    }
    
}

// Start the timer:
function start() {
    
    let textEnteredLength = testArea.value.length;
    
    if (textEnteredLength === 0 && !timerRunning ){
        
        timerRunning = true;
        interval = setInterval(runTimer, 10);
    }
    
    console.log(textEnteredLength);
}

// Reset everything:
function reset() {
    
    clearInterval(interval);
    interval = null;
    
    timer = [0,0,0,0];
    timerRunning = false;
    
    testArea.value = "";
    theTimer.innerHTML = "00:00:00";
    testWrapper.style.borderColor = "grey";
}


// Event listeners for keyboard input and the reset button:
testArea.addEventListener("keypress", start, false);
testArea.addEventListener("keyup", spellCheck, false );
resetButton.addEventListener("click", reset, false);
!
999px

Console