Why Do Images Have Unexpected Bottom Padding Even with Zero Margins and Padding?

Understanding Mysterious Padding Beneath Images

Why do images often have an unexplained empty space underneath them, even when padding and margins are set to zero?

Explanation

Images are treated as inline-block elements, similar to characters in text. They adhere to the rule of the baseline, which is a line that runs across the bottom of most letters. However, certain letters like "p" and "q" have descenders that extend below the baseline. To prevent these descenders from clashing with subsequent lines, space is reserved below the baseline.

Images are aligned to this baseline, resulting in extra space at the bottom even in the absence of text.

Solution

To alleviate this issue, apply the CSS property vertical-align: bottom to the image. This will align the image to the bottom of the line, eliminating the mysterious padding.

Caution

While this solution resolves the padding issue, it can create another if the image is smaller than the line height. In such cases, extra space may appear above the image. To rectify this, add line-height: 1px to the container element.

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