Why are My Flexbox Elements Rendering Inconsistently in Firefox and Chrome 48?

Cross-Browser Rendering Issues with Flexbox in Firefox and Chrome 48

Background

A recent update to the flexbox specification has introduced a change in the default minimum size for flex items to match the content size. While Chrome 47 implemented this change correctly, Chrome 48 and Firefox have exhibited issues with the rendering of flexbox elements.

Problem

In Firefox, certain flexbox elements with overflowing content behave unexpectedly. While Chrome 47 rendered these elements correctly, Chrome 48 now matches Firefox's behavior.

Solution

To address this issue, you can explicitly override the default minimum size of these elements using the following CSS properties:

.content {
    min-width: 0;
    min-height: 0;
}

This ensures that the flexbox elements can correctly shrink to fit their content, resolving the rendering problems.

Details from Specification

The flexbox specification states:

"To provide a more reasonable default minimum size for flex items, this specification introduces a new auto value as the initial value of the min-width and min-height properties defined in CSS 2.1."

Impact on Chrome 48

According to observations, the initial implementation of the flexbox update in Chrome 48 emulated Firefox's behavior, causing similar rendering issues. However, subsequent reports indicate that Chrome 48 has updated its rendering behavior to match the solution provided above.

Conclusion

By explicitly setting the minimum size of flex items to 0 in both directions, you can effectively resolve the rendering issues experienced in Firefox and Chrome 48 when handling overflowing content.

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