CSS Box Sizing
Since the result of using the box-sizing: border-box; is so much better, many developers want all box-sizing. Defines how the width and height of an element are calculated: should they include...
Box Sizing | CSS-Tricks | The "Old" border-box Reset
With box-sizing: border-box;, we can change the box model to what was once the "quirky" way, where an element's specified width and height aren't affected by padding or borders.
Learn About CSS box-sizing: CSS Border Box Explained
CSS border-box is the most popular choice for setting box-sizing. It guarantees that the content box Therefore, if you set your element width to 200 pixels, border-box makes sure that the content...
Can I use... Support tables for HTML5, CSS3, etc
CSS3 Box-sizing. Firefox versions before 57 also supported the padding-box value for box-sizing, though this value was been removed from the specification and later versions of the browser.
CSS box model - Wikipedia
In web development, the CSS box model refers to how HTML elements are modeled in browser engines and how dimension of those HTML elements are derived from CSS properties. It is a fundamental concept for the composition of HTML webpages.