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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).

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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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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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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.

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About Packages

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 

              
                <div style="padding:6px; text-align:center;">
		<input type="button" onClick="iBold(rtContent);" value="B" />
		<input type="button" onClick="iItalic(rtContent);" value="I" />
		<input type="button" onClick="iUnderline(rtContent);" value="U" />
		<input type="button" onClick="iFontSize(rtContent);" value="Font Size" />
		<input type="button" onClick="iFontColor(rtContent);" value="Font Color" />
		<input type="button" onClick="iLink(rtContent);" value="Link" />
		<input type="button" onClick="iUnLink(rtContent);" value="Remove Link" />
		<input type="button" onClick="iOrderedList(rtContent);" value="Numbered List" />
    <br />
		<input type="button" onClick="iUnorderedList(rtContent);" value="Bulleted List" />
		<input type="button" onClick="iImg(rtContent);" value="Insert Image" />
		<input type="button" onClick="iYouTube();" value="Embed YouTube" />
		<input type="button" onClick="iVimeo();" value="Embed Vimeo" />
		<input type="button" onClick="iGoogleDoc();" value="Embed GoogleDoc" />
  <br /><br />
  <form method="POST" action="classes.php?mode=new" name="contentForm" id="contentForm">
      <textarea style="display:none;" cols="75" rows="4" name="content" id="content"></textarea>
      <iframe name="rtContent" id="rtContent" class="rtContentBox"></iframe>
  </form>
  
</div>
!

CSS 

              
                /* edit page styling */
.rtContentBox {
	border: #999 1px solid;
	width: 100%;
	height: 200px;
}
input {
  padding: 6px;
  margin: 4px 8px 4px 0px;
}
!

JS 

              
                iFrameOn();

function iFrameOn () {
	rtContent.document.designMode = 'On';
	if ( document.contains(document.getElementById("rtContent2")) ) {
	rtContent2.document.designMode = 'On';
	}
}
function iBold (targetFrame) {
	targetFrame.document.execCommand('bold',false,null);
}
function iItalic (targetFrame) {
	targetFrame.document.execCommand('italic',false,null);
}
function iUnderline (targetFrame) {
	targetFrame.document.execCommand('underline',false,null);
}
function iUploadImg (url) {
	var win = window.open(url, '_blank');
	win.focus();
}
function iImg (targetFrame) {
	var imgSrc = prompt('Enter the image\'s location URL. Use the "Upload Image" button to upload an image from your computer and then enter the URL it provides on the confirmation page.','http://');
	if ( imgSrc != null){
		targetFrame.document.execCommand('insertimage',false,imgSrc)	
	}
}
function iLink (targetFrame) {
	var linkURL = prompt('Enter the URL for this link:', 'http://');
	if ( linkURL != null){
		targetFrame.document.execCommand('CreateLink',false,linkURL);
	}
}
function iUnLink (targetFrame) {
	targetFrame.document.execCommand('UnLink',false,null);
}
function iYouTube () {
	var youTubeLink = prompt('Enter the YouTube video URL. Make sure nothing is appended to it. For help on how to do this, see the support page.', 'http://');
	var youTubeEmbed = '[youtube]' + youTubeLink + '[/youtube]';
	window.frames['rtContent'].document.body.innerHTML = window.frames['rtContent'].document.body.innerHTML + youTubeEmbed;
}
function iVimeo () {
	var vimeoLink = prompt('Enter the Vimeo video URL.', 'http://');
	var vimeoEmbed = '[vimeo]' + vimeoLink + '[/vimeo]';
	window.frames['rtContent'].document.body.innerHTML = window.frames['rtContent'].document.body.innerHTML + vimeoEmbed;
}
function iGoogleDoc () {
	var googleDocLink = prompt('Enter the Google Doc Link.', 'https://');
	var googleDocEmbed = '[googledoc]' + googleDocLink + '[/googledoc]';
	window.frames['rtContent'].document.body.innerHTML = window.frames['rtContent'].document.body.innerHTML + googleDocEmbed;
}
function iFontSize (targetFrame) {
	var fSize = prompt('Enter a size, 1 - 7.', '');
	targetFrame.document.execCommand('FontSize',false,fSize)
}
function iFontColor (targetFrame) {
	var fColor = prompt('Enter a basic color or use a hexadecimal color code.', '');
	targetFrame.document.execCommand('ForeColor',false,fColor)
}
function iUnorderedList (targetFrame) {
	targetFrame.document.execCommand('InsertUnorderedList',false,'newUL');
	targetFrame.focus();
}
function iOrderedList (targetFrame) {
	targetFrame.document.execCommand('InsertOrderedList',false,'newOL');
	targetFrame.focus();
}
function submitForm () {
	var theForm = document.getElementById("contentForm");
	theForm.elements["content"].value = window.frames['rtContent'].document.body.innerHTML;
	if ( document.contains(theForm.elements["preview"]) ) {
	theForm.elements["preview"].value = window.frames['rtContent2'].document.body.innerHTML;
	}
	theForm.submit();
}
!
999px

Console