Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

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.

Behavior

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Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <div id="target">Your message will be typed out here!</div>
<button onClick="rerun()">Rerun</button>

<!-- See the JavaScript box for an explanation and how to customize -->
              
            
!

CSS

              
                @import 'https://fonts.googleapis.com/css?family=Fira+Mono';


html {
	font-size: 18px;
}

body {
	color: #333;
	background: #f8f8f8;
	font-family: 'Fira Mono', mono;
	font-size: 1rem;
	margin: 0;
	display: grid;
	width: 100%;
	height: 100vh;
	justify-items: center;
	align-items: center;
	padding: 0 6vw;
	box-sizing: border-box;
	line-height: 1.4;
}

div {
	width: 100%;
	max-width: 30em;
	white-space: pre-line;
}

div:after {
	content: '|';
	animation: cursor 1s linear infinite;
}

button {
	font-family: 'Fira Mono', mono;
	padding: 1em;
	font-size: 14px;
	border-radius: 4px;
	background: transparent;
	border: 2px solid #a7a8aa;
	color: #a7a8aa;
	cursor: pointer;
}

@keyframes cursor {
	0% {
		opacity: 0;
	}
	49.9% {
		opacity: 0;
	}
	50% {
		opacity: 1;
	}
	99.9% {
		opacity: 1;
	}
}
              
            
!

JS

              
                // Want to see your own message appear? 
// Just change the message value!
const message = `Machines can measure things a user will never notice, and users will notice things a machine can never measure.

If a user thinks your site is slow, a speed test won't convince them otherwise.`;


// Want to use this in your own code? Just copy and paste everything here, but change the value of the "container" variable (currently '#target') to match your chosen target DOM element.
// Also be sure the target element has the right white-space CSS in your code.
const container = document.querySelector('#target');




let n;

function rerun(){
	container.textContent = '';
	n = 0;
	typist(message, container);
};

rerun();

function interval(letter){
	console.log(letter);
	if(letter == ';' || letter == '.' || letter == ','){
		return Math.floor((Math.random() * 500) + 500);
	} else {
		return Math.floor((Math.random() * 130) + 5);
	}
}

function typist(text, target){
	if(typeof(text[n]) != 'undefined'){
		target.textContent += text[n];
	}
	n++;
	if(n < text.length){
		setTimeout(function(){
			typist(text, target)
		}, interval(text[n - 1]));
	} 
}


              
            
!
999px

Console