Creating web components with HTML templates is a technique used in web development to create reusable components that can be easily added to a web page. It involves defining a custom HTML element using an HTML template, which can then be used multiple times on a web page without having to rewrite the same code again and again.

Here’s an example of creating a custom HTML element using an HTML template:

<!-- Define the template for the custom element -->
<template id="custom-element-template">
    /* Define the styles for the custom element */
    h2 {
      color: blue;
  <h2>Custom Element</h2>
  <p>This is a custom element created using HTML templates.</p>

<!-- Define the custom element using the template -->
  class CustomElement extends HTMLElement {
    constructor() {
      const template = document.getElementById("custom-element-template");
      const templateContent = template.content;
      const shadowRoot = this.attachShadow({mode: 'open'}).appendChild(
  customElements.define('custom-element', CustomElement);

In this example, we define a custom element called custom-element by extending the HTMLElement class. Inside the constructor method, we retrieve the HTML template using its ID and append it to the shadow DOM of the custom element. The shadow DOM is a separate DOM tree that is used to encapsulate the styles and content of the custom element.

Once the custom element is defined, it can be used on the web page like any other HTML element:

<!-- Use the custom element on the web page -->

When the web page is rendered, the custom element is replaced by the content of the HTML template, which can be different for each instance of the element. The styles defined in the template are also encapsulated within the shadow DOM, ensuring that they don’t affect the styles of other elements on the web page.

Using HTML templates to create web components is a powerful technique that can help improve the maintainability and reusability of web applications. It allows developers to define custom elements with their own styles and behavior, which can be easily added to any web page.

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