Why Do Inline Elements Display Differently in Browser Developer Tools Than Expected?

Understanding Line-Height in Inline Elements

Despite thorough research, uncertainties persist regarding the operation of line-height in inline elements. To clarify, let's address the following questions:

Why does an inline text with font-size: 15px display 18px in developer tools?

Inline elements' line-height determines the line box's height, not the inline element itself. In this case, the line box height is indeed 15px. However, browser developer tools often display the content area's height, which varies based on the font and can exceed the line box height. This accounts for the discrepancy between expected and observed heights.

Why does an inline element's background color extend beyond the line box height?

The background color of an inline element does not extend beyond the line-height, contrary to the second question. Line-height defines the space between lines, including space above and below the element's content. The background color covers the element's content area, including any padding.

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