Reusable custom HTML elements

Day 131 of 149

👉 Full deep-dive with code examples

The LEGO Brick Analogy

LEGO bricks are reusable building blocks:

Each brick works independently

Combine them to build anything

Same brick works in any LEGO set

Web Components are LEGO bricks for websites!

Create a component once, use it anywhere.

The Problem They Solve

Before Web Components:

Copying HTML, CSS, JS between projects

Styles from one component affecting others

Different frameworks couldn't share components

Hard to encapsulate functionality

What Web Components Give You

Custom Elements:

Define your own HTML tags

<user-card> instead of <div class="user-card">

Shadow DOM:

Component has its own isolated styles

No CSS leaking in or out

HTML Templates:

Reusable HTML structures

Only rendered when needed

A Simple Example

Create a custom element:

<my-greeting name= "Alice" ></my-greeting>

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Renders as:

Hello, Alice!…