Why Did Bootstrap 3 Switch to Border-Box Sizing?

Bootstrap's Embracing of Border-Box: Unveiling the Rationale

In transitioning from Bootstrap 2 to 3, developers may encounter dimensional discrepancies attributed to the implementation of the border-box sizing mechanism for all elements. Why did Bootstrap opt for this significant change?

The official Bootstrap release notes hint at the reason, stating that border-box sizing enhances sizing flexibility and the grid system. Examining the implications of this decision sheds light on its significance.

Border-box sizing endows elements with a consistent size across browsers, simplifying layout and design calculations. Moreover, it facilitates a more streamlined experience for creating responsive layouts, particularly in the context of Bootstrap's fluid, percentage-based grid system.

In Bootstrap's grid, column widths are expressed as percentages of the total grid width, while gutters maintain a fixed pixel value. By employing border-box sizing, these disparate units become compatible, eliminating potential complexities in determining column and gutter dimensions.

Experts like Paul Irish have staunchly advocated for border-box sizing, emphasizing its superiority in achieving consistent, predictable results. This embrace of border-box by Bootstrap underscores its commitment to providing a robust and accessible framework for web development.

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