Why Are My Bootstrap xs Columns Wrapping Instead of Stacking Below 360px?

Bootstrap: xs Columns Unexpectedly Wrapping

The Bootstrap framework simplifies responsive design by providing utilities for creating flexible and efficient layouts. However, users sometimes encounter unexpected issues when columns do not behave as anticipated, especially in the extra small (xs) size.

Issue: xs Columns Wrapping Instead of Stacking

Normally, when a row's columns add up to 12, they should stack vertically as the screen width decreases. However, on smaller screens, a column may unexpectedly wrap towards the beginning of the screen instead of the end.

Cause: Browser Mismatch

This behavior arises due to a known issue in Bootstrap. In screen widths less than 360px, columns with a width of 1% (col-xs-1) may not fit properly within the container. Despite specifying a 1% width, the 15px padding on both sides effectively makes the column wider, causing a mismatch with the browser's layout engine.

Solution: Avoid col-xs-1 for Small Screens

To avoid this issue, consider not using col-xs-1 on screens smaller than 360px. Determine if your application realistically anticipates users resizing the screen below this limit.

Note for Bootstrap 4

In Bootstrap 4, the col-xs-1 class has been renamed to col-1. The issue described above still applies to col-1 in Bootstrap 4.

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