Why Isn't My Flexbox Working in Internet Explorer 11, and How Can I Fix It?

Flexbox Not Functioning in IE: Causes and Workarounds

As you've encountered, flexbox can malfunction in Internet Explorer 11. This is due to a parsing issue with the flex property. Fortunately, there are several workarounds to resolve this:

1. Utilize Long-hand Properties:

Instead of using shorthand (e.g., "flex: 0 0 35%"), break it down into long-hand properties:

flex-grow: 0;
flex-shrink: 0;
flex-basis: 35%;

2. Enable Flex-shrink:

Ensure flex-shrink is enabled by replacing "flex: 0 0 35%" with:

flex: 0 1 35%;

3. Handle Percentage and Unitless Values:

Use variations with flex-basis, especially if you're unsure about your IE11 version:

flex: 1 1 0;
flex: 1 1 0px;
flex: 1 1 0%;

4. Consider flex: auto:

Instead of "flex: 1," use "flex: auto" (equivalent to "flex: 1 1 auto"). This will prevent item collapse when switching from row to column flex direction.

5. Use Width/Height Properties:

As a fallback, consider reverting to traditional width/height properties.

6. Opt for Block Layout:

In specific instances, block layout (i.e., "display: block") may be a viable alternative to flex layout.

Additional Tips:

• Be wary of minifiers that may convert 0px to 0 (an issue that doesn't affect 0%).

• Refer to the following resources for further insight:

  • Image behavior in flexbox: https://stackoverflow.com/q/23051125
  • Shorthand vs. long-hand properties in IE: https://stackoverflow.com/q/24549977

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