explaingit

foundation/foundation-sites

★ 29,764HTMLAudience · developerComplexity · 2/5StaleLicenseSetup · easy

TLDR

A front-end framework with pre-built responsive components, grids, buttons, forms, menus, that automatically adapt to any screen size and include accessibility support.

Mindmap

mindmap
  root((Foundation Sites))
    What it does
      Responsive grid system
      Pre-built UI components
      Accessibility built-in
    Components
      Buttons and forms
      Navigation menus
      Modals and accordions
    Tech stack
      Sass mixins
      JavaScript plugins
      CSS
    Use cases
      Build responsive websites
      Create web applications
      Customize without overrides
    Audience
      Front-end developers
      Web designers
      Teams needing quick start

Things people build with this

USE CASE 1

Build a responsive website that looks good on phones, tablets, and desktops without writing layout CSS from scratch.

USE CASE 2

Create a web application with pre-styled forms, buttons, and interactive components like modals and dropdowns.

USE CASE 3

Customize the default design using Sass mixins instead of overriding CSS rules manually.

USE CASE 4

Ensure your site is accessible to users with screen readers or keyboard-only navigation out of the box.

Tech stack

HTMLCSSSassJavaScript

Getting it running

Difficulty · easy Time to first run · 5min
Foundation is open-source under the MIT license, allowing free use for any purpose including commercial projects, as long as you include the original copyright notice.

In plain English

Foundation for Sites is a collection of pre-built web design components, grids, buttons, navigation menus, form elements, and more, that help developers build websites and web apps that look correct and work properly on screens of any size, from phones to desktops. This kind of collection is called a front-end framework (front-end meaning the part of a website users see and interact with). The core feature is a responsive grid system: a way of dividing a page into columns that automatically rearrange themselves depending on how wide the browser window is. Foundation also provides a large set of Sass mixins, reusable style rules written in a preprocessor language called Sass that compiles down to regular CSS, so developers can customize the look without overriding defaults manually. JavaScript plugins handle interactive elements like modal windows, dropdown menus, and accordions. Foundation includes built-in accessibility support, meaning it follows standards that help people using screen readers or keyboard-only navigation. Someone would use Foundation when building a website or web application and wants a solid, customizable starting point for responsive layout and common UI (user interface) patterns without designing everything from scratch.

Copy-paste prompts

Prompt 1
How do I set up Foundation for Sites in my project and use the responsive grid to create a mobile-first layout?
Prompt 2
Show me how to customize Foundation's default button and form styles using Sass mixins without breaking the framework.
Prompt 3
How do I add interactive components like modal windows and dropdown menus to my Foundation site using the JavaScript plugins?
Prompt 4
What accessibility features does Foundation include, and how do I ensure my custom components follow the same standards?
Prompt 5
I want to build a landing page with Foundation, walk me through the basic HTML structure and component usage.
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Generated 2026-05-18 · Model: sonnet-4-6 · Verify against the repo before relying on details.