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HTML

CSS

CSS Base

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JavaScript

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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If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

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HTML

              
                <div class="article-content">

  <h3>Lorem ipsum dolor sit amet.</h3>
  <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Quas temporibus impedit, qui doloribus eos deleniti commodi accusantium vel quibusdam neque ducimus, laudantium tempora iure ullam obcaecati deserunt ipsam pariatur incidunt.</p>
  <h3>Ducimus deserunt amet aliquid laudantium.</h3>
  <p>Eligendi eum neque ipsa voluptate ipsam necessitatibus? Nemo, quis esse voluptatem obcaecati tempore natus? Vel inventore nisi explicabo facilis, autem mollitia earum eos velit quae et adipisci, quos perspiciatis ipsam.</p>
  <h3>Laudantium architecto provident porro sunt.</h3>
  <p>Harum nihil ut dignissimos sed earum, tempore atque praesentium quisquam aperiam cupiditate dolor. Iusto blanditiis neque cupiditate illo perferendis et est vero praesentium enim vitae voluptatem, itaque qui eum obcaecati.</p>

</div>
              
            
!

CSS

              
                body {
  max-width: 500px;
  margin: 1rem auto;
  padding: 2rem;
  font: 300 100%/1.6 system-ui;
}

h3 a {
  margin-right: 0.2rem;
}

              
            
!

JS

              
                const $headers = $(".article-content > h3");

$headers.each((i, el) => {
  const $el = $(el);

  // skip it if it already has a link inside
  if ($el.has("a").length != 0) {
    return;
  }

  let idToLink = "";

  // skip it if it already has an id
  if ($el.attr("id") === undefined) {
    // give it ID to match
    idToLink = "article-header-id-" + i;
    $el.attr("id", idToLink);
  } else {
    // make sure the ID matches
    idToLink = $el.attr("id");
  }

  // append a little linky #
  const $headerLink = $("<a />", {
    html: "#",
    class: "article-headline-link",
    href: "#" + idToLink
  });
  $el.addClass("has-header-link").prepend($headerLink);
});

              
            
!
999px

Console