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

Welcome to HTML5 Template

This is a responsive HTML5 template with a sticky right sidebar, header, and footer. The sidebar is expandable and includes control buttons for various actions.

Features

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.

More Content

This template demonstrates a clean, modern design with smooth animations and transitions. The sidebar remains sticky while scrolling, making it easy to access controls at any time.

This HTML5 template includes all the features you requested: Key Features: 1. **Sticky Right Sidebar**: Stays in position while scrolling, positioned with `position: sticky` 2. **Expandable Sidebar**: Click the header to collapse/expand the sidebar content 3. **Responsive Header**: Sticky header with navigation that adapts to mobile devices 4. **Footer**: Clean footer at the bottom of the page Four Control Buttons: 1. **📄 Preview**: Opens the current page in a new window 2. **🔍 View Source**: Shows the HTML source code in a modal 3. **💾 Save to File**: Downloads the HTML as a file 4. **✏️ Edit in Browser**: Toggles content editing mode Additional Features: • **Responsive Design**: Works on desktop, tablet, and mobile • **Modern Styling**: Gradient backgrounds, smooth transitions, hover effects • **Accessibility**: Proper semantic HTML5 structure • **Interactive Elements**: Smooth scrolling, modal dialogs • **Clean Code**: Well-organized CSS and JavaScript The template is fully functional and ready to use. You can customize the colors, fonts, and layout to match your specific needs. The sidebar remains sticky and accessible while scrolling, and all the control buttons work as intended.