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CSS box model
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<p>In <a href="/facts/Web_development/UW5ypSzj">web development</a>, the CSS box model refers to how HTML elements are modeled in <a href="/facts/Browser_engine/wLna3ate">browser engines</a> and how the dimensions of those HTML elements are derived from <a href="/facts/CSS/tA90XBQo">CSS</a> properties. It is a fundamental concept for the composition of <a href="/facts/HTML/sSc3fT78">HTML</a> webpages. The guidelines of the box model are described by web standards <a href="/facts/World_Wide_Web_Consortium/lGWmhF6M">World Wide Web Consortium (W3C)</a> specifically the CSS Working Group. For much of the late-1990s and early 2000s there had been non-standard compliant implementations of the box model in mainstream browsers. With the advent of <a href="/facts/CSS/tA90XBQo">CSS2</a> in 1998, which introduced the box-sizing property, the problem had mostly been resolved. </p>