Why Do Firefox and Edge Handle Percentage Padding and Margins on Flex Items Differently?

Unveiling the Mystery of Percentage Padding and Margins in Firefox and Edge

In the realm of flex items, the saga of percentage padding and margins has bewildered developers using Firefox and Edge. While Chrome plays along nicely, these browsers exhibit peculiar behavior that leaves us scratching our heads.

According to the flexbox specification, flex items can be a bit unpredictable when it comes to percentages in their padding or margins. Here's the root of the issue:

Multiple Margin/Padding Resolution Mechanisms:

The flexbox specification allows for two possible interpretations when calculating percentages in these dimensions:

1. Axis-based resolution: Percentages are calculated relative to the item's own axis (e.g., left/right for width, top/bottom for height).
2. Inline-axis resolution: All percentages are calculated relative to the item's inline axis (i.e., the width).

Both Firefox and Edge have adopted different approaches, leading to inconsistencies in their behavior. This variation stems from the browsers' choice of resolution mechanism, resulting in the following:

Firefox's Interpretation:

• Percentages in padding and margins are resolved against the inline axis, which is always the width in both horizontal and vertical writing modes.

Edge's Interpretation:

• Firefox has not yet updated to the more recent flexbox specification, and therefore follows the older behavior.

Solution:

To ensure consistent behavior across all browsers, avoid using percentage padding and margins on flex items altogether. By following this crucial advice, you can steer clear of the cross-browser inconsistencies that might otherwise plague your code.

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