Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

+ 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

Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

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

              
                In our *getter* function, we'll check if the value is `Slitherin`. If it is, we'll return `Hisssssss....` instead. And in our *setter*, we'll save our data to `localStorage` whenever it's updated.

Open up the console, or `localStorage` in your browser's dev tools, to see it in action.
              
            
!

CSS

              
                
              
            
!

JS

              
                var wizards = {
	neville: 'Gryffindor',
	malfoy: 'Slitherin',
	cedric: 'Hufflepuff'
};

// Getter and Setter
var handler = {
	get: function(obj, prop) {

		// Hiss for Slitherin
		if (obj[prop] === 'Slitherin') {
			return 'Hisssssss....';
		}

		// Return the value
		// This is what happens by default when you don't have a Proxy
		return obj[prop];

	},
	set: function(obj, prop, value) {

		// Save our wizards to localStorage
		localStorage.setItem('wizardsAndSuch', JSON.stringify(obj));

		// Set a property
		// This is what happens by default when you don't have a Proxy
		obj[prop] = value;

		// Indicate success
		return true;

	},
	deleteProperty: function (obj, prop) {

		// Save our wizards to localStorage
		localStorage.setItem('wizardsAndSuch', JSON.stringify(obj));

		// Delete the property
		delete obj[prop];

		// Indicate success
		return true;

	}
};

// Create a proxy
var wizardsProxy= new Proxy(wizards, handler);

// Get/Set smoe data
wizardsProxy.gilderoy = 'Ravenclaw';
console.log(wizardsProxy.malfoy);

              
            
!
999px

Console