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CSS3 Box-sizing

99.66

CSS3

Method of specifying whether or not an element's borders and padding should be included in size units

Further reading:

  1. Can I use page for: CSS3 Box-sizing
  2. MDN Web Docs - CSS box-sizing
  3. Blog post
  4. Polyfill for IE
  5. CSS Tricks
  6. WebPlatform Docs