The box-sizing Property in CSS is used to control how the total width and height of an element are calculated, including its content, padding, and border. The default value box-sizing can vary depending on the browser.

Default Value:

• The default value for the box-sizing property is often considered to be content-box.
• However, note that the default behavior can vary among different browsers.

Syntax:

/* Explicitly setting box-sizing to content-box */
.element {
  box-sizing: content-box;
}

Features:

• content-box:
  • This is often considered the default value.
  • It calculates the total width and height of an element by considering only the content, excluding padding and border.
• Cross-Browser Considerations: While content-box is commonly considered the default, some browsers may have a different default behavior.
• border-box as an Alternative: Using box-sizing: border-box; is an alternative approach, which includes padding and border in the total dimensions of the element.