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Pen Settings

CSS Base

Vendor Prefixing

Add External CSS

These stylesheets will be added in this order and before the code you write in the CSS editor. You can also add another Pen here, and it will pull the CSS from it. Try typing "font" or "ribbon" below.

Quick-add: + add another resource

Add External JavaScript

These scripts will run in this order and before the code in the JavaScript editor. You can also link to another Pen here, and it will run the JavaScript from it. Also try typing the name of any popular library.

Quick-add: + add another resource

Code Indentation


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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.

              <main class="main">
  <div class="js-container"></div>

              let data = 'randomStringToCreateAnArray'.split('');

let list = d3.select('.js-container')

// Selection

// returns a new empty selection, since the list container was empty.
// The parent node of this selection is the list container
let itemBinding = list.selectAll('.item')
// joined to an array of data, resulting in three new selections
// that represent the three possible states: enter, update, and exit.

// Since the selection was empty, the update and exit selections are empty,
// while the enter selection contains a placeholder for each new datum.

// The update selection is returned by selection.data

// Update
itemBinding.attr('class', 'update');

// Enter
  .append('li').classed('enter', true)
  .text(function(d) { return d; });

// Exit
// Remove all elements as needed

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