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

              
                <h1>The advantages of the template element</h1>

<section>
  <h2>Using <code>document.createElement</code></h2>
  <div id="container1" class="grid"></div>
</section>

<section>
  <h2>Using <code>&lt;template></code></h2>
  <div id="container2" class="grid"></div>
</section>

<!--
  This template won't be rendered at first
  It waits here until we clone it from our JS and append a copy to the page
-->
<template id="articleTemplate">
  <article class="card">
    <img alt="" class="card__image">
    <div class="card__body">
      <h3 class="card__title"></h3>
      <p></p>
    </div>
  </article>
</template>
              
            
!

CSS

              
                * {
  box-sizing: border-box;
}

body {
  max-width: 80rem;
  margin: 0 auto; /* center the 80rem wide container within the page */
  padding: 2rem;
  font-family: system-ui;
}

section {
  margin-top: 4rem;
}

.grid {
  display: grid;
  /* create an automatic grid that fits as many columns that are at least 14rem wide as possible */
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  grid-gap: 2rem;
}

.card {
  border-radius: 8px;
  /* two layered box shadows give a more natural floaty effect */
  box-shadow:
    0 2px 2px hsla(180, 10%, 20%, 0.2),
    0 8px 20px hsla(180, 10%, 20%, 0.3); 
  overflow: hidden; /* stop the image poking out of the top at the rounded corners */
}

.card__image {
  width: 100%;
  object-fit: cover; /* stops the image getting squished as the card's size changes */
}

.card__body {
  padding: 1rem;
}

.card__title {
  margin: 0;
  line-height: 1;
  text-transform: capitalize; /* make the first letter of each word uppercase */
}
              
            
!

JS

              
                // an array of data we want to render to the DOM
const articles = [
  {
    title: "my nice article",
    summary:
      "Lorem ipsum dolor sit amet consectetur adipisicing elit. Voluptatibus, omnis!",
    image: "https://source.unsplash.com/400x300?0",
  },
  {
    title: "another article",
    summary:
      "Lorem ipsum dolor sit amet consectetur adipisicing elit. Voluptatibus, omnis!",
    image: "https://source.unsplash.com/400x300?1",
  },
  {
    title: "so many articles",
    summary:
      "Lorem ipsum dolor sit amet consectetur adipisicing elit. Voluptatibus, omnis!",
    image: "https://source.unsplash.com/400x300?2",
  },
  {
    title: "my nice article",
    summary:
      "Lorem ipsum dolor sit amet consectetur adipisicing elit. Voluptatibus, omnis!",
    image: "https://source.unsplash.com/400x300?3",
  },
];

const containerElement1 = document.querySelector("#container1");

// this function uses standard createElement to do DOM manipulation
// it'll only get longer as we add more stuff to the card element 🙃
function createCard(article) {
  const { title, summary, image } = article;
  
  // create all the elements we need and set their properties based on the data passed in to this function
  const articleElement = document.createElement("article");
  articleElement.classList.add("card");
  
  const bodyElement = document.createElement("div");
  bodyElement.classList.add("card__body");
  
  const titleElement = document.createElement("h2");
  titleElement.textContent = title;
  titleElement.classList.add("card__title");
  
  const imageElement = document.createElement("img");
  imageElement.src = image;
  imageElement.alt = "";
  imageElement.classList.add("card__image")
  
  const summaryElement = document.createElement("p");
  summaryElement.textContent = summary;
  
  
  // put each child element into the parent <article>
  articleElement.appendChild(imageElement);
  bodyElement.appendChild(titleElement);
  bodyElement.appendChild(summaryElement);
  articleElement.appendChild(bodyElement);
  
  // put the <article> onto the page
  containerElement1.appendChild(articleElement);
}

const containerElement2 = document.querySelector("#container2");

// this function uses the <template> defined in the HTML
// it'll only get longer if we need to add more dynamic properties
function createCardUsingTemplate(article) {
  const { title, summary, image } = article;
  // get the template for articles (from the HTML)
  const template = document.querySelector("#articleTemplate");
  // clone the content of the template (returns a DocumentFragment)
  const domFragment = template.content.cloneNode(true);
  // we only need to add the dynamic properties inside the fragment
  // since all the static ones (e.g. styling classNames) are set in the template
  domFragment.querySelector("h3").textContent = title;
  domFragment.querySelector("img").src = image;
  domFragment.querySelector("p").textContent = summary;
  // put the fragment onto the page
  containerElement2.appendChild(domFragment);
}

articles.forEach(createCard);
articles.forEach(createCardUsingTemplate);

              
            
!
999px

Console