Compare box-sizing: content-box and border-box.

Q: Compare box-sizing: content-box and border-box.

`box-sizing` determines how the width and height of an element are calculated. With `content-box` (the default), the width and height include only the content; padding and border are added outside, increasing total element size. With `border-box`, the width and height include content, padding, and border, keeping the total size fixed. /* content-box (default) */ div.content { width: 200px; padding: 20px; border: 5px solid black; box-sizing: content-box; } /* Total width = 200 + 40 (padding) + 10 (border) = 250px */ /* border-box */ div.border { width: 200px; padding: 20px; border: 5px solid black; box-sizing: border-box; } /* Total width = 200px (content + padding + border included) */ content-box: width/height includes only content; padding and border increase total size. border-box: width/height includes content, padding, and border; total size remains as specified. border-box simplifies layout calculations and prevents unexpected overflow. content-box is the default, but many developers prefer border-box for predictable sizing.

Difficulty: 5/10

box-sizing, layout, responsive design

Comparing `content-box` and `border-box` in CSS

box-sizing determines how the width and height of an element are calculated. With content-box (the default), the width and height include only the content; padding and border are added outside, increasing total element size. With border-box, the width and height include content, padding, and border, keeping the total size fixed.

Example Comparison

Key Differences

1
content-box: width/height includes only content; padding and border increase total size.
2
border-box: width/height includes content, padding, and border; total size remains as specified.
3
border-box simplifies layout calculations and prevents unexpected overflow.
4
content-box is the default, but many developers prefer border-box for predictable sizing.

Scenario Questions

0-2 years experience

Follow-up Questions

Difficulty: 5/10

box-sizing, layout, responsive design

Comparing `content-box` and `border-box` in CSS

Example Comparison

Key Differences

1
content-box: width/height includes only content; padding and border increase total size.
2
border-box: width/height includes content, padding, and border; total size remains as specified.
3
border-box simplifies layout calculations and prevents unexpected overflow.
4
content-box is the default, but many developers prefer border-box for predictable sizing.

Scenario Questions

0-2 years experience

Compare box-sizing: content-box and border-box.

Comparing content-box and border-box in CSS

Scenario Questions

Follow-up Questions

Compare box-sizing: content-box and border-box.

Comparing content-box and border-box in CSS

Scenario Questions

Follow-up Questions

Comparing `content-box` and `border-box` in CSS

Comparing `content-box` and `border-box` in CSS