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A JavaScript polyfill for Flexbox

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Quick Overview

The flexibility project is a JavaScript library that provides a polyfill for the CSS Flexible Box Layout module, also known as Flexbox. It aims to provide a consistent and reliable implementation of Flexbox across different browsers, including older versions that do not natively support the Flexbox specification.

Pros

  • Cross-Browser Compatibility: The library works across a wide range of browsers, including older versions that lack native Flexbox support, ensuring a consistent layout experience.
  • Comprehensive Flexbox Support: It implements a comprehensive set of Flexbox properties and features, providing a robust solution for complex layout needs.
  • Lightweight and Efficient: The library is relatively small in size and efficient in its implementation, minimizing the impact on page load times.
  • Active Maintenance: The project is actively maintained, with regular updates and bug fixes to ensure compatibility with the latest Flexbox specifications.

Cons

  • Dependency on JavaScript: The library requires JavaScript to be enabled in the browser, which may not be suitable for certain use cases where progressive enhancement is a priority.
  • Potential Performance Impact: While the library is designed to be efficient, the use of JavaScript-based layout solutions can still have a slight performance impact compared to native Flexbox support.
  • Limited Flexbox Feature Support: While the library aims to provide comprehensive Flexbox support, there may be some edge cases or newer Flexbox features that are not yet fully implemented.
  • Potential Compatibility Issues: As with any polyfill, there may be some edge cases or browser-specific quirks that can cause compatibility issues, requiring additional troubleshooting or workarounds.

Code Examples

Here are a few examples of how to use the flexibility library:

  1. Enabling Flexbox Layout:
// Import the flexibility library
import 'flexibility';

// Apply the flexibility polyfill to the document
document.documentElement.classList.add('flexibility');
  1. Defining a Flexbox Container:
<div class="flex-container">
  <div class="flex-item">Item 1</div>
  <div class="flex-item">Item 2</div>
  <div class="flex-item">Item 3</div>
</div>

.flex-container {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}

.flex-item {
  flex: 1;
}
  1. Responsive Flexbox Layout:
.flex-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

.flex-item {
  flex: 0 1 200px;
  margin: 10px;
}

@media (max-width: 768px) {
  .flex-item {
    flex-basis: 150px;
  }
}

Getting Started

To use the flexibility library, follow these steps:

  1. Install the library using npm or yarn:
npm install flexibility
  1. Import the library in your JavaScript file:
import 'flexibility';
  1. Apply the flexibility class to the <html> element in your HTML:
<html class="flexibility">
  <!-- Your content goes here -->
</html>
  1. Optionally, you can use the flexibility class in your CSS to target specific elements:
.flexibility .flex-container {
  display: flex;
  /* Flexbox styles go here */
}

That's it! With these steps, you can start using the flexibility library to provide Flexbox support across a wide range of browsers.

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README

flexibility

Flexibility Logo

A JavaScript polyfill for Flexbox

npm bower ci gitter

Flexibility is a polyfill for the Flexible Box Layout, commonly known as Flexbox. With Flexibility, you get to design beautiful, flexible layouts on the web without sacrificing the experience in older browsers.

Flexbox lays out, aligns, and distributes elements in a container, even when their size is unknown or dynamic. To better understand Flexbox, read Chris Coyier’s excellent Complete Guide to Flexbox.

To start using Flexbox in Internet Explorer 8 & 9 or any older browser, download the flexibility.js script and include it anywhere on your page.

<script src="flexibility.js"></script>

If you’re only targeting Internet Explorer 10 and lower, add a -js-display: flex declaration before any display: flex declarations in your CSS, or use PostCSS Flexibility to automate this during your build process.

.container {
	-js-display: flex;
	display: flex;
}

If you’re targeting other browsers, use the data-style attribute to alert these browsers to your changes.

<div data-style="display: flex;"></div>

When you’re ready to polyfill flexbox with JavaScript, use the flexibility method on the outermost element you would like to polyfill.

flexibility(document.documentElement);

API

The global flexibility method contains child functions for use within your own framework.

flexibility.read

Argument: Element

Return flexbox related styles from an element.

flexibility.readAll

Argument: Element

Return a list of flexbox details from a matching element or its descendants.

flexibility.write

Argument: Details

Writes flexbox details back to their respective elements.

flexibility.writeAll

Argument: Array

Writes a list of flexbox details back to their respective elements.

To learn more about Flexibility, read the support section.

If you experience an issue, read the contributing section before creating an issue.

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