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>
Renders as:
Hello, Alice! Welcome to our site.
Use it anywhere like a regular HTML tag!
Benefits
- Encapsulation → Styles and logic stay inside
- Reusability → Same component in any project
- Framework agnostic → Works with React, Vue, or vanilla JS
- Native browser support → No library needed
Common Uses
- Design systems → Company-wide UI components
- Widgets → Video players, date pickers
- Micro frontends → Independent components from different teams
In One Sentence
Web Components let you create custom, reusable HTML elements with encapsulated styles and behavior that work in any web project.
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