Online HTML / CSS / JS Editor

Online HTML / CSS / JS Editor - Code, Preview & Share

Thinkforu.org HTML / CSS / JS Editor

HTML Only CSS Only JavaScript Only All Files (Zip)

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HTML Formatter JSON Formatter

User Guide

Getting Started

Welcome to our advanced online code editor! Here's how to make the most of it:

  • Use the three tabs to switch between HTML, CSS, and JavaScript editors
  • See your changes in real-time in the preview panel
  • Share your code with others using the share button
  • Download your code in various formats

Advanced Features

  • Syntax highlighting for better code readability
  • Auto-completion for HTML tags, CSS properties, and JavaScript functions
  • Multiple download options (HTML, CSS, JS separately or all together)
  • Customizable editor settings (theme, font size, etc.)
  • Responsive design for mobile devices

Complete User Guide for Online Code Editor

Table of Contents

User Guide

1. Getting Started

1.1 Interface Overview

The editor features three main components:

  • Editor Panel (Left Side)
    • Tabbed interface for HTML, CSS, and JavaScript
    • Line numbers and error indicators
    • File tree view (collapsible)
  • Preview Panel (Right Side)
    • Real-time rendering of your code
    • Device preview selector (mobile/tablet/desktop)
    • Console output tab
  • Toolbar (Top Bar)
    • Save/Share/Download buttons
    • Settings menu
    • Collaboration toggle

1.2 Basic Workflow

  1. Start a New Project:
    • Click "+ New Project" in the toolbar
    • Choose from templates or start blank
  2. Write Code:
    • Switch between tabs using Ctrl/Cmd + 1/2/3
    • Use Alt+Up/Down to move lines
  3. Preview Results:
    • Auto-updates as you type (1s delay)
    • Click ⟳ to manual refresh
  4. Save/Export:
    • Auto-saves every 30 seconds to browser storage
    • Export options: .zip, GitHub Gist, or individual files

2. Advanced Features

2.1 Intelligent Editing

  • Smart Autocomplete:
    • HTML: Type "!" for boilerplate
    • CSS: View vendor prefix suggestions
    • JS: Access common API suggestions
  • Code Validation:
    • Real-time error checking
    • Hover over red underlines for details
  • Multi-Cursor Editing:
    • Ctrl/Cmd + Click to add cursors
    • Alt + Drag for vertical selection

2.2 Customization

  • Themes:
    • 10+ dark/light themes (Monokai, Solarized, etc.)
    • Custom CSS injection in settings
  • Key Bindings:
    • Choose between VSCode, Sublime, or Vim modes
  • Extensions:
    • Add Preprocessors (Sass, TypeScript)
    • Integrate UI libraries (React, Vue)

3. Collaboration & Sharing

  • Real-Time Pair Programming:
    • Click "Share" → "Live Collab" to get a session link
    • Chat feature with @mention support
  • Version Control:
    • Auto-version history (last 30 days)
    • Branching/merging interface
  • Export Options:
    • Generate PDF reports with code+preview
    • Publish to static hosting with one click

Frequently Asked Questions

How secure is my code?

All code is private unless shared. We use SSL encryption and regular security audits. For sensitive projects, enable "Private Mode" in settings to disable browser caching.

Why aren't my CSS changes visible?

Try these troubleshooting steps: 1. Check for selector specificity conflicts 2. Look for console errors affecting CSS injection 3. Clear cache with Ctrl/Cmd + Shift + R 4. Ensure media queries match preview device size

Can I import existing projects?

Yes! Drag-and-drop files into the editor panel or use our GitHub importer. Supported formats include .zip, .tar, and individual code files.

What's the file size limit?

Browser storage allows up to 5MB per project. For larger projects, consider using our cloud storage upgrade (up to 1GB).

How do keyboard shortcuts work?

We support: - Basic editing: Ctrl/Cmd + S, Z, Y - Code formatting: Alt + Shift + F - Multi-pane navigation: Ctrl/Cmd + ←→ Customize shortcuts in Settings > Key Bindings

🚀 Ultimate Web Development Survival Guide 📜🎨⚡

📋 Table of Contents

📄 HTML5 Essential Syntax

🏗️ Basic Structure

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>🚀 My Page</title>
</head>
<body>
    <!-- Your content here -->
</body>
</html>

🔖 Top HTML Tags

📦 Semantic Tags

  • <header> 🏷️
  • <nav> 🗺️
  • <main> 🎯
  • <article> 📰
  • <footer> 👣

🎮 Interactive Elements

  • <dialog open> 💬
  • <details> 📑
  • <progress> 📊
  • <datalist> 📋

🖼️ Media Elements

  • <picture> 🖼️
  • <audio controls> 🎵
  • <video autoplay> 🎬
  • <canvas> 🎨

🎨 CSS3 Sorcery Guide

🎯 Selector Wizardry

/* Attribute selector */
a[target="_blank"] { 🌐 }

/* Pseudo-classes */
button:hover { 🖱️ }
li:nth-child(odd) { 🔢 }

/* Combinators */
div > p { ➡️ }
h1 + p { ➕ }

💎 Layout Gems

/* Grid */
.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem; 🧱
}

/* Flexbox */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center; 📦
}

🌈 Popular Properties

🎀 Text Styles

  • font-variant: small-caps; 🔠
  • text-shadow: 2px 2px #ff0000; 👻
  • line-clamp: 3; ✂️

🎭 Animations

@keyframes spin {
    to { transform: rotate(360deg); 🌀 }
}

.spinner {
    animation: spin 2s linear infinite;
}

🌌 Gradients

background: linear-gradient(
    45deg,
    #ff6b6b,
    #4ecdc4 🎨
);

🕶️ Filters

.vintage {
    filter: sepia(80%) blur(1px);
} 📷

⚡ JavaScript Lightning Reference

📦 ES6+ Essentials

// Arrow functions
const add = (a, b) => a + b; ➕

// Destructuring
const { name, age } = user; 🧩

// Spread operator
const newArr = [...oldArr, newItem]; 🍱

🎮 DOM Manipulation

// Query elements
const btn = document.querySelector('.btn'); 🔍

// Event listeners
btn.addEventListener('click', () => {
    console.log('Clicked!'); 🖱️
});

// Create elements
const div = document.createElement('div'); 🆕

🧩 Common Patterns

⏳ Async/Await

async function fetchData() {
    try {
        const res = await fetch(url);
        const data = await res.json(); 📡
    } catch (error) {
        console.error('⚠️', error);
    }
}

🔁 Array Methods

const nums = [1, 2, 3];
nums.map(n => n * 2); ➗
nums.filter(n => n > 1); 🚫
nums.reduce((a, b) => a + b); ➕

🎭 Closure Example

function createCounter() {
    let count = 0;
    return () => count++; 📈
}

❓ Burning Questions? We've Got Answers! 🔥

🐛 Why isn't my CSS animation working?

🔧 Checklist: 1. Check animation-name spelling 2. Verify @keyframes exist 3. Ensure duration > 0 4. Test with !important

🌐 How to center a div? (The Eternal Question) 
.center-me {
    /* Modern Way */
    place-items: center;
    
    /* Classic Flexbox */
    display: flex;
    justify-content: center;
    align-items: center;
}

💡 Editor Ninja Tricks 🥷

⚡ Live Templates

Type these shortcuts:

  • html:5 → Full boilerplate
  • lorem → Generate dummy text
  • cl → console.log()

🎨 Color Picker

Click any color value to get:
🎭 HSL picker
🌈 Gradient generator
🖌️ Contrast checker

FAQ

How do I save my code?

Your code is automatically saved in your browser's local storage. You can also download it using the download button.

Can I share my code with others?

Yes! Click the share button to generate a unique link that you can share with others.

Is this editor mobile-friendly?

Yes, our editor is fully responsive and works great on mobile devices and tablets.

What browsers are supported?

The editor works in all modern browsers including Chrome, Firefox, Safari, and Edge.