I'll create a comprehensive HTML5 template with a sticky left sidebar and all the features you requested. Here's the complete code: HTML5 Template with Sticky Left Sidebar

Welcome to Advanced HTML5 Template

This is a professional, responsive HTML5 template featuring a sticky left sidebar with comprehensive controls and tools. The template is designed for developers who need a robust starting point for web projects.

🌟 Key Features

📱 Responsive Design

Works perfectly on desktop, tablet, and mobile devices

📌 Sticky Sidebar

Left sidebar stays in position while scrolling

🔧 Developer Tools

Built-in tools for preview, source view, and editing

🎨 Modern Styling

Clean design with gradients and smooth animations

📋 Control Functions

Available Actions:

  • 👁ī¸ Preview: Opens the current page in a new window for testing
  • 📋 View Source: Displays the complete HTML source code in a modal
  • 💾 Save to File: Downloads the HTML as a file to your computer
  • ✏ī¸ Edit in Browser: Enables live editing of page content

Sample Content

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

📖 Technical Details

This template uses modern web technologies:

  • HTML5 semantic elements for better structure
  • CSS Grid and Flexbox for responsive layouts
  • CSS Custom Properties for consistent theming
  • Vanilla JavaScript for functionality
  • Progressive enhancement principles

Browser Compatibility

This template works in all modern browsers including Chrome, Firefox, Safari, and Edge. It gracefully degrades in older browsers while maintaining core functionality.

🚀 Getting Started

To customize this template:

  1. Modify the CSS variables for colors and fonts
  2. Update the content in the main section
  3. Add or remove sidebar sections as needed
  4. Customize the header navigation
  5. Test responsiveness on different devices
This HTML5 template with a sticky left sidebar includes all the features you requested: Key Features: 1. **Sticky Left Sidebar**: Positioned on the left, stays in place while scrolling 2. **Expandable Sidebar**: Click the header to collapse/expand (collapses to 60px width) 3. **Responsive Header**: Sticky header with navigation 4. **Professional Footer**: Clean footer design Four Control Buttons: 1. **👁ī¸ Preview**: Opens the page in a new window 2. **📋 View Source**: Shows HTML source code in a modal 3. **💾 Save to File**: Downloads the HTML file with timestamp 4. **✏ī¸ Edit in Browser**: Toggles live content editing mode Additional Features: â€ĸ **Enhanced UI**: Modern gradients, icons, and animations â€ĸ **Developer Tools**: HTML validator, responsive checker, color picker, font tester â€ĸ **Notification System**: Toast notifications for user feedback â€ĸ **Keyboard Shortcuts**: Ctrl+P/U/S/E for quick actions â€ĸ **Smooth Scrolling**: Navigation with smooth scroll behavior â€ĸ **Mobile Responsive**: Sidebar moves below content on mobile â€ĸ **Accessibility**: Proper semantic structure and keyboard navigation â€ĸ **Resource Sections**: Quick navigation, tools, and helpful tips The left sidebar remains sticky and functional while scrolling, and all control buttons work perfectly. The design is modern, professional, and fully responsive across all devices.