A Web Component to add anchor links to headings with IDs.

Demo | Styling demo | Further reading

<script type="module" src="heading-anchors.js"></script>

<heading-anchors>
  <h2 id="heading-level-2">Heading level 2</h2>
  <p>Lorem ipsum dolor sit amet consectetur adipisicing elit.</p>

  <h3 id="heading-level-3">Heading level 3</h3>
  <p>
    Excepturi eligendi exercitationem, ratione, in delectus vitae veritatis
    dolorem porro cupiditate quam eaque voluptates.
  </p>
</heading-anchors>

This Web Component allows you to:

• Add anchor links to headings which have an ID attribute and value
• Customise which elements will be appended with an anchor link using the selector attribute
• Customise where the anchor link is appended using the position attribute

You have a few options (choose one of these):

1. Install via npm: npm install @daviddarnes/heading-anchors (also avaialbe on jsr)
2. Download the source manually from GitHub into your project.
3. Skip this step and use the script directly via a 3rd party CDN (not recommended for production use)

Make sure you include the <script> in your project (choose one of these):

<!-- Host yourself -->
<script type="module" src="heading-anchors.js"></script>

<!-- 3rd party CDN, not recommended for production use -->
<script
  type="module"
  src="https://www.unpkg.com/@daviddarnes/[email protected]/heading-anchors.js"
></script>

<!-- 3rd party CDN, not recommended for production use -->
<script
  type="module"
  src="https://esm.sh/@daviddarnes/[email protected]"
></script>

By default heading-anchors will select all the h2[id], h3[id] and h4[id] elements within it to append an anchor link to. However with the selector attribute you can pass in a different selector string to select:

<heading-anchors selector="h2[id]">
  <!-- ... -->
</heading-anchors>

Note: It's recommended you use selectors that utilise the [id] attribute selector for better reliability

By default heading-anchors will append anchor links right after the element, using the insertAdjacentHTML API. However you can adjust this using the position attribute:

<heading-anchors position="beforeend">
  <!-- ... -->
</heading-anchors>

With thanks to the following people:

• Zach Leatherman for inspiring this Web Component repo template
• Curtis Wilcox for the accessibility feedback