The Ultimate Guide of Using Web Components in Modern Web Development published 8/29/2023 | 4 min read


In the fast-paced world of web development, evolving approaches, tools, and technologies can be challenging to keep up with. One key technology, both modern and future-oriented, is Web Components. As a composite of features already baked into browsers, Web Components allow us to bundle HTML, CSS, and JavaScript to craft reusable and versatile components.

This comprehensive guide will explore more on harnessing the power of Web Components, emphasizing why they're considered the future of web development.

Web Components - A Brief Overview

Web Components are a set of web platform APIs that allow you to create new custom, reusable, encapsulated HTML tags for use in web pages and web apps. They are part of the browser, meaning they're native web components. Web Components work across modern browsers and can be utilized with any JavaScript library or framework that works with HTML.

Web components are based on four main technologies:

  1. Custom Elements: A set of JavaScript APIs that allow you to define custom elements and their functionality, optionally associating them with a class you can also create.

  2. Shadow DOM: A set of JavaScript APIs for attaching a hidden, separate DOM to an element.

  3. HTML templates: <template> and <slot> elements enable you to write reusable markup templates that can be consumed and then stamped out in the document multiple times.

  4. ES Modules: A feature of JavaScript for including and managing dependencies.

Leveraging Web Components in Your Project

By employing web components, developers can achieve faster load times, better performance, and efficient code organization due to component-based structure. Below are primary ways you can harness the power of web components in your project:

// Define a new custom element
class MyCustomElement extends HTMLElement {
  connectedCallback() {
    this.innerHTML = `<p>Hello, Devspedia!</p>`;

// Register your new custom element with the browser
customElements.define('my-custom-element', MyCustomElement);

In your HTML, you can now use the new element just like any other HTML element.


This will display "Hello, Devspedia!" on the web page.

Working with Shadow DOM

The Shadow DOM offers encapsulation, whereby you can keep the markup structure, style, and behavior hidden and separate from other code on the page, so they don’t clash with each other.

// Define the new custom element
class MyShadowDom extends HTMLElement {
  constructor() {
    var shadow = this.attachShadow({mode: 'open'});
    var childElem = document.createElement("p");
    childElem.textContent = "Hello from Shadow DOM!";

// Register the new custom element
customElements.define('my-shadow-dom', MyShadowDom);

In your HTML:


This will also display "Hello from Shadow DOM!" on the web page, but the Shadow DOM keeps the "p" element separate from the rest of the document’s DOM.

The Future of Web Components

Web components are gaining popularity due to the ever-increasing need for efficient, high-performance web apps. They hold the promise of code reusability, encapsulation, and framework-agnostic components, making them remarkably ideal for modern web development.

Mastering web components could set you apart as a web developer and provide you with the tools to create highly versatile web apps. The future of web development is right here, make use of it!

You may also like reading: