CSS3 Box-sizing
Method of specifying whether or not an element's borders and padding should be included in size units. Box-sizing is a CSS property that makes CSS layouts work intuitively. If you’ve been working with CSS for any period of time, you know that using properties like width, padding, and border can be confusing. Sometimes when you use the width property, it doesn’t always apply in the way that you might expect. However, with proper box-sizing, a width of 200px really means a rendered width of 200px. It doesn’t involve any JavaScript magic, and it even works across browsers as far back as IE8.

CSS
BROWSER SUPPORT FOR CSS3 Box-sizing
Google Chrome
CSS3 Box-sizing
is partially compatible with prefix -webkit-
for Chrome browser version 4 to Chrome browser version 9. Chrome browser version 10 to Chrome browser version 67 supports this browser property.
Mozilla Firefox
CSS3 Box-sizing
is partially supported with prefix -moz-
for Mozilla Firefox browser version 2 to Mozilla Firefox browser version 28. Mozilla Firefox browser version 29 to Mozilla Firefox browser version 60 supports this browser property.
Internet Explorer
Internet Explorer browser version 6 and Internet Explorer browser version 7 doesn't support this browser element. Internet Explorer browser version 8 to Internet Explorer browser version 11 supports this property.
Safari
Safari browser version 3.1 to Safari browser version 5 partially support this web element with prefix -webkit-
.Later Safari browser version 5.1 to Safari browser version 11.1 supports this browser element.
Microsoft Edge
CSS3 Box-sizing
element is supported by Microsoft Edge browser.
Opera
Opera browser supports this browser property.
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.

Information sourced from
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