Responsive Slot Layout

Build Responsive Layouts
Without the Framework Bloat

Zero dependencies. Accessibility-first. Works everywhere.

The lightweight CSS framework that gives you powerful grid layouts, 30+ UI components, and a JSON-driven API—all in pure vanilla JavaScript. Use it standalone or integrate with React, Vue, or any framework. No build tools required, no bloat.

Get Started in 60 Seconds
<link rel="stylesheet" href="rsl/grid.css">
<script src="rsl/layout.js"></script>

<div class="slot-layout" data-cols-md="3">
  <div class="slot-item">Card 1</div>
  <div class="slot-item">Card 2</div>
  <div class="slot-item">Card 3</div>
</div>
Perfect for: Landing Pages • Marketing Sites • Portfolios • Admin Dashboards • Web Apps
Download RSL Read Documentation
Pure Vanilla JavaScript
All Modern Browsers
Built for WCAG 2.1 AA Compliance

Why Developers Choose RSL

Four core principles that make RSL different from traditional frameworks.

Zero Dependencies

Pure vanilla JavaScript and CSS. Works standalone or integrates seamlessly with React, Vue, Angular, or any framework. No jQuery, no build tools required. Lightning-fast performance with minimal footprint—just include and go.

Learn more

Accessibility First

Built for WCAG 2.1 AA compliance. Proper ARIA labels, keyboard navigation, screen reader support, and reduced-motion preferences built into every component.

View docs

Truly Responsive

Mobile-first design with 6 breakpoints and intelligent grid system. Your layouts automatically adapt from 320px phones to 4K displays—no manual media queries needed.

Explore grid

JSON-Driven API

Define layouts as data. Store in databases, load from APIs, and create dynamic user-customizable interfaces. Perfect for CMSs and app builders.

JSON API docs

See RSL in Action

Watch how RSL grids automatically adapt to different screen sizes. Try the interactive demo below.

Header / Navigation

Sidebar Menu

Main Content Area

Widgets / Aside

Footer

Current width: 100% • Breakpoint: XL
Named Grid Areas with RSL: 
<div class="slot-layout"
     data-layout-pattern-xs="stacked"
     data-layout-pattern-md="holy-grail">
  <div class="slot-item" data-area="header">Header</div>
  <div class="slot-item" data-area="sidebar">Sidebar</div>
  <div class="slot-item" data-area="content">Main</div>
  <div class="slot-item" data-area="aside">Widgets</div>
  <div class="slot-item" data-area="footer">Footer</div>
</div>
Browse All Components
0KB
Dependencies
0+
Components
0%
Accessible
0
Breakpoints

Why RSL Matters for Your Business

Faster Load Times

Better SEO rankings and improved conversion rates from faster page speeds

Legal Compliance

Helps to avoid ADA lawsuits with built-in WCAG 2.1 AA accessibility compliance

Lower Costs

Zero dependencies mean no licensing fees or recurring framework update costs

Easy Hiring

Clean HTML/CSS makes it easy for any developer to maintain your site

Built on Principles That Matter

RSL was created to solve real problems developers face every day. No marketing hype, no fake metrics—just honest, quality tools.

No Vendor Lock-In

RSL is pure HTML, CSS, and JavaScript. No proprietary syntax, no framework coupling. If you ever want to leave, just remove the files—your HTML stays clean and portable.

Built for WCAG 2.1 AA Compliance

Built from a decade of experience implementing ADA guidelines and WCAG compliance standards. Every component is accessibility-tested and production-ready.

Transparent Development

Every line of code is documented. No magic, no hidden dependencies. You can read the source, understand exactly what's happening, and modify it if needed.

Our Promise to You

RSL will always prioritize developer experience, accessibility, and performance over trendy features. We won't chase every new JavaScript framework or add bloat to check marketing boxes. What you see is what you get—clean, tested, and production-ready code.

Production-Ready Templates

Jump-start your project with professionally designed website templates built entirely with RSL.

Blog & Magazine

Feature-rich blog templates with sidebars, mega menus, and advanced features like dark mode.

Portfolio

Showcase your work with modern portfolio templates featuring project galleries and contact forms.

Business & More

Restaurant, service business, and other professional templates ready to deploy.

Browse All Templates

How RSL Compares

See the difference between RSL and popular frameworks like Bootstrap, Tailwind, and Material-UI.

Feature Bootstrap Tailwind Material-UI RSL
Bundle Size (min+gzip) ~25KB ~10KB* ~80KB ~8KB
Dependencies jQuery/Popper PostCSS React Zero
Build Tools Required
Accessibility (WCAG 2.1) Partial Manual Partial Built-in
Learning Curve Medium Medium High Low
JSON-Driven Layouts

* Tailwind requires PurgeCSS configuration to achieve minimal size
* RSL core grid system only. Full component library available separately.

Bootstrap / Tailwind / Material-UI

  • Large bundle sizes (25-80KB+)
  • Requires build tools or dependencies
  • Steep learning curve with utility classes or React
  • Accessibility requires manual implementation
  • Framework lock-in limits flexibility
The RSL Advantage

Responsive Slot Layout

  • Tiny 8KB bundle (smaller than all competitors)
  • Pure vanilla JS—no build tools, no dependencies
  • Minimal learning curve, intuitive data attributes
  • WCAG 2.1 AA accessibility built into every component
  • Works with any stack—React, Vue, vanilla, anything
  • Unique JSON API for dynamic, data-driven layouts

Use RSL Your Way

RSL is framework-agnostic. Use it standalone for maximum performance, or integrate it seamlessly with your existing tech stack.

With React

Use RSL for layout management while React handles state. Perfect for Next.js, Gatsby, or Create React App.

With Vue

Combine Vue's reactivity with RSL's responsive grids. Works great with Nuxt or standalone Vue apps.

Pure Vanilla

Maximum performance, zero overhead. Just include the files and start building—no setup required.

Progressive Enhancement

Add RSL to existing sites gradually. Replace Bootstrap's grid system without touching other code.

No vendor lock-in. Your HTML stays clean and framework-agnostic. If you ever want to stop using RSL, just remove the CSS and JS files—your markup remains valid and portable.

Production-Ready Templates

Professional, fully-responsive templates built with RSL. Each template showcases real-world layouts, accessibility features, and best practices you can customize for your projects.

View All Templates

Start Building with RSL Today

Build responsive, accessible layouts without the framework bloat.

Download RSL Now View Documentation

Zero Dependencies • Accessibility Built-In • Production Ready