Why is There a Gap Between My Image and Div Border Despite Zero Margin and Padding?

Anchoring Element Displacement

In your code, you have an anchor tag surrounding an image enclosed within a div with a border. Despite setting both margin and padding to 0, you encounter a persistent gap of approximately 3 pixels between the image and the div's border.

The Root Cause: Inline Display

The root cause of this discrepancy lies in the inline display of the image element. When displayed inline, images behave similarly to characters within text. Consequently, they are positioned on the baseline, which accommodates descenders, such as those found in characters like "j," "g," "y," and "p."

Resolution: Adjusting Vertical Alignment

To eliminate this unwanted space, you can adjust the vertical alignment of the image using CSS. By applying the style rule "img {vertical-align: bottom}", you instruct the image to align itself at the bottom of the line, eliminating the gap between the image and the border of the div.

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