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    <p>To me, and I base this entirely on opinion, it's the expected "natural" behaviour.</p> <p>Consider this:</p> <p>You know how CSS specificity is calculated, and from that formula we know that <code>#outer span</code> is more specific than <code>#outer</code>, which is necessary for CSS on the whole to work correctly, and it makes sense. <code>#outer span</code> is also more specific than <code>#inner</code>, which is also logical within the domain of the stylesheet (<code>#inner</code> is only an ID, and <code>#outer span</code> is an ID plus an element, so in order to rank them if we are <em>just</em> looking at the stylesheet, the more qualified one must be more specific).</p> <p>What's happening here is that you're applying the context of the HTML markup, and saying "Well, that doesn't make sense." To make things work the way that you're expecting, the browser would have to consier the following:</p> <ul> <li>This <code>&lt;span id="inner"&gt;</code> is inside <code>&lt;div id="outer"&gt;</code></li> <li>The stylesheet rules for <code>#outer span</code> and <code>#inner</code> apply</li> <li>The rule <code>#outer span</code> is more specific than <code>#inner</code></li> <li>But wait! <code>&lt;span id="inner"&gt;</code> is inside <code>&lt;div id="outer"&gt;</code>, so ignore the calculations based on the stylesheet and claim that <code>#inner</code> is more specific</li> </ul> <p>That last step makes the determination process entirely based on the structure of the HTML, which makes it impossible to define the specificity in terms of the CSS alone. I personally believe that this would make the entire process more convoluted and hard to define, but you may disagree.</p>
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    1. POWhy is the # selector of lesser specificity than anything?
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    1. USTim Stone
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    1. COYou meant "id" not "class" in the first paragraph. I'm not sure how to send PM's in SO, but I understand. I'm not applying HTML here at all, I understand that CSS has rules in HTML, and no id can be used more than once in a page, meaning I can only be talking about 1 element when I write a rule for an id only. My question is why would I ever want rules that I write for that lone element to be overwritten.
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    2. COYour whole process could be bypassed with that simple understanding. It's not valid HTML if an id is declared twice, therefore any rules by id can only be talking about 1 element.
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    3. COWhoops, not sure what I was thinking. Thanks, I corrected that now. And you're right, but how would you define that in terms of what you can determine in the CSS alone? There's no way using the CSS specificity rules that `#inner` could be more specific than `#outer span`, because `#outer span` must be more specific than `#outer`. We know that `#inner` could be considered more specific once we get to the HTML, but when we're parsing the CSS I don't see a good way to know/define that.
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