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copied!<p>I'll just toss in a link to the CSS 2.1 spec itself, and how browsers are <em>supposed</em> to calculate specificity:</p> <p><a href="http://www.w3.org/TR/CSS2/cascade.html#specificity">CSS 2.1 Section 6.4.3</a>:</p> <blockquote> <p>A selector's specificity is calculated as follows:</p> <ul> <li>count 1 if the declaration is from is a 'style' attribute rather than a rule with a selector, 0 otherwise (= a) (In HTML, values of an element's "style" attribute are style sheet rules. These rules have no selectors, so a=1, b=0, c=0, and d=0.)</li> <li>count the number of ID attributes in the selector (= b)</li> <li>count the number of other attributes and pseudo-classes in the selector (= c)</li> <li>count the number of element names and pseudo-elements in the selector (= d)</li> <li>The specificity is based only on the form of the selector. In particular, a selector of the form "[id=p33]" is counted as an attribute selector (a=0, b=0, c=1, d=0), even if the id attribute is defined as an "ID" in the source document's DTD.</li> </ul> <p>Concatenating the four numbers a-b-c-d (in a number system with a large base) gives the specificity.</p> </blockquote> <p>If the specificities are equal, then <a href="https://www.w3.org/TR/CSS2/cascade.html#cascading-order">CSS 2.1 Section 6.4.1</a> comes into play: </p> <blockquote> <ol start="4"> <li>Finally, sort by order specified: if two declarations have the same weight, origin and specificity, the latter specified wins. Declarations in imported style sheets are considered to be before any declarations in the style sheet itself.</li> </ol> </blockquote> <p>Note that this is talking about when the style is defined, not when it is used. If classes <code>.a</code> and <code>.b</code> have equal specificity, whichever is defined last <strong>in the stylesheet(s)</strong> wins. <code><p class="a b">...</p></code> and <code><p class="b a">...</p></code> will be styled identically, based on the definition order of <code>.a</code> and <code>.b</code>.</p>

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