Developing a modal popup using the <dialog> HTML tag can offer a native and standardized way to create popups without relying heavily on JavaScript libraries. The <dialog> element represents a part of an application that the user interacts with to perform a task, such as a dialog box, inspector, or window.

Integrating HTML Element

The <dialog> tag is very simple to implement. Here’s a basic example of how you can integrate it into your HTML:

<dialog class="modal" id="modal">
  <h2>An awesome modal title</h2>
  <p>Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.</p>
  <p>Nam liber tempor cum soluta nobis eleifend</p>
  <button class="button close-button">close modal</button>
</dialog>

<button class="button open-button">open modal</button>

Using JavaScript to Handle the Modal

To open and close the dialog, you need to add some JavaScript code to toggle the open attribute of the <dialog> element.

document.addEventListener('DOMContentLoaded', function () {
  const modal = document.querySelector("#modal");
  const openModal = document.querySelector(".open-button");
  const closeModal = document.querySelector(".close-button");

  openModal.addEventListener("click", () => {
    modal.showModal();
  });

  closeModal.addEventListener("click", () => {
    modal.close();
  });
});

Styling with CSS

To style the <dialog>, you can use CSS as you would with any other HTML element. Here’s an example of how you might style the dialog:

.modal {
  border: 0;
  box-shadow: 0 0 1em rgb(0 0 0 / 30%);
  max-width: 60ch;
}

.modal::backdrop {
  background: rgb(0 0 0 / 40%);
}

.button {
  background-color: #333;
  border: none;
  color: #fff;
  cursor: pointer;
  padding: .5rem 1rem;
}

.button:hover {
  background-color: #555;
}

Codepen

Browser Compatibility and Fallback

The <dialog> element is supported in most of modern browsers, but you should always check the compatibility and implement a fallback for unsupported browsers, usually by utilizing JavaScript libraries or other modal implementation methods.

Conclusion

Integrating and using a <dialog> element is fairly simple. It's essential for developers to use the <dialog> element where suitable because it follows the standard web specifications and ensures better accessibility and cleaner code structure.

Developing a modal popup using <dialog> can greatly simplify the process of creating interactive and user-friendly web applications, reducing reliance on heavy libraries and frameworks while maintaining clean and semantic code.