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HTML

About HTML Preprocessors

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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

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

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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).

Add External Stylesheets/Pens

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About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

If the stylesheet you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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.

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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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Behavior

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HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

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HTML 

            
              <h1>Bookmarklet to make the text between 45 and 75 characters turn red.</h1>

<p><a class="bookmarklet-link" href="javascript:(function(){function%20loadScript(a,b){var%20c=document.createElement('script');c.type='text/javascript';c.src=a;var%20d=document.getElementsByTagName('head')[0],done=false;c.onload=c.onreadystatechange=function(){if(!done&&(!this.readyState||this.readyState=='loaded'||this.readyState=='complete')){done=true;b()}};d.appendChild(c)}loadScript('//ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js',function(){

var redOutline={outline:'2px solid red'},text;var textyElements='p, li, dt, dd, h1, h2, h3, h4, h5, h6';$(textyElements).on('mouseover.red',function(){$(this).css(redOutline)}).on('mouseleave.red',function(){$(this).removeAttr('style')}).on('click.red',function(){text=$(this).text();var e=text.substring(0,45);var t=text.substring(45,75);var n=text.substring(75,text.length);var r=e+'<span style=\'color: red;\'>'+t+'</span>'+n;$(this).html(r);$(textyElements).off('mouseover.red mouseleave.red click.red');$(this).removeAttr('style');})
            
 })})()">45-75</a>

&larr; Click that. Then hover over a text element and click that.
</p>

<p>Drag it to your Bookmarks bar to save.</p>

<p>Why? Because that's generally the ideal line length for body copy. When those characters are red you can adjust media queries and font-size and stuff until it's about right at any screen size.</p>

<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>

<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Velit amet distinctio ab minus repudiandae earum similique sapiente eos maiores illo ut veniam nisi incidunt quaerat ipsam cum ducimus animi id autem illum. Aliquid consequatur a optio illum blanditiis earum error voluptates suscipit in dignissimos facilis ab perferendis modi itaque ullam nam nostrum laborum velit vero est maiores iste quae nesciunt deserunt qui natus aut laudantium magnam neque fugiat animi accusamus eum dolorem? Accusantium earum beatae minus aspernatur recusandae enim unde qui veniam accusamus atque voluptate numquam! Dignissimos aut aspernatur quae enim ab animi deserunt possimus blanditiis cupiditate nobis incidunt velit.</p>
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CSS 

            
              /* Mobile First */
body {
  font-family: "Lucida Grande", sans-serif;
  margin: 20px auto;
  width: 95%;
  font-size: 70%;
  line-height: 1.4;
}
@media (min-width: 400px) {
  body { width: 90%; font-size: 75%; }
}
@media (min-width: 700px) {
  body { width: 80%; font-size: 90%; }
}
@media (min-width: 850px) {
  body { width: 70%; font-size: 100%; }
}
@media (min-width: 1000px) {
  body { width: 60%; font-size: 110%; }
}
@media (min-width: 1100px) {
  body { width: 50%; font-size: 115%;}
}
@media (min-width: 1450px) {
  body { width: 40%; font-size: 125%; }
}

p {
  margin: 0 0 1.4rem 0;
}

.bookmarklet-link {
  border-radius: 4px;
  background: linear-gradient(#eee, #ccc);
  padding: 5px 10px;
  border: 1px solid #999;
  color: #222;
  text-decoration: none;
}
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JS
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