How Can I Implement Flexbox in IE9 Without Sacrificing Cross-Browser Compatibility?

IE9 Flexbox Alternatives

For websites developed initially in Chrome and intended for IE support, addressing Flexbox implementation in IE9 poses challenges. While IE11 and Chrome support Flexbox, IE9 does not. To avoid browser-specific stylesheets, alternative methods are required.

Modernizr as a Detection Tool

Modernizr detects browser capabilities, including Flexbox support. It adds classes to the HTML element based on detection results, such as flexbox, no-flexbox, and flexbox-legacy. This allows for the application of fallback styles:

<code class="css">.container {
  display: flex;
}
.no-flexbox .container {
  display: table-cell;
}</code>

Fallback Techniques

Zoe Gillenwater's presentations provide valuable insights into Flexbox fallbacks for IE9:

• Horizontal Navigation Spacing: Utilizing display: inline-block;
• Pinning Elements: Using display: table-cell;
• Form Alignment: Considering the use of fallback methods like table-based layouts;
• Flex Order: Applying display properties judiciously, considering both Flexbox-enabled and non-Flexbox browsers.

Other noteworthy tips include:

• Browser Support: IE10 provides better Flexbox support (as per caniuse.com).
• Prefixing: Autoprefixer can simplify cross-browser compatibility.
• Fallback Merits: Flexbox fallbacks allow for backward compatibility without compromising design principles.

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