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POWhy do functional pseudos such as :not() and :has() allow quoted arguments?
 

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  1. POWhy do functional pseudos such as :not() and :has() allow quoted arguments?
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    <p>Apparently, as I've discovered while commenting on <a href="https://stackoverflow.com/questions/12472110/jquery-get-the-last-tr-with-a-th/12472203#12472203">another answer</a>, jQuery (rather its underlying selector engine <a href="http://sizzlejs.com" rel="nofollow noreferrer">Sizzle</a>) lets you quote the argument to the <code>:not()</code> selector as well as the <code>:has()</code> selector. <a href="http://jsfiddle.net/BoltClock/bRE9u" rel="nofollow noreferrer">To wit</a>:</p> <pre><code>$('div:not("span")') $('span:has("span")') </code></pre> <p>In the <a href="http://www.w3.org/TR/selectors" rel="nofollow noreferrer">Selectors standard</a>, quotes are always representative of a string and never of a selector or a keyword, so quoting the argument to <code>:not()</code> is always invalid. <a href="http://www.w3.org/TR/selectors4/#negation" rel="nofollow noreferrer">This will not change in Selectors 4.</a></p> <p>You can also see that it's non-standard syntax by adding an <a href="https://stackoverflow.com/questions/11745274/what-css3-selectors-does-jquery-really-support-e-g-nth-last-child">unsupported CSS selector</a> such as <code>:nth-last-child(1)</code> <a href="http://jsfiddle.net/BoltClock/bRE9u/1" rel="nofollow noreferrer">causing the selector to fail completely</a>:</p> <pre><code>$('div:not("span"):nth-last-child(1)') $('span:has("span"):nth-last-child(1)') </code></pre> <p>Is there any good reason, technical or otherwise, for allowing quotes here? The only possibilities that come to mind are:</p> <ul> <li><p>Consistency with <code>:contains()</code> which allows both quoted and unquoted arguments, as seen in <a href="http://www.w3.org/TR/2001/CR-css3-selectors-20011113/#content-selectors" rel="nofollow noreferrer">the old Selectors spec</a>. Except <code>:contains()</code> accepts strings/keywords, not selectors...</p></li> <li><p>Consistency with the implementation of custom pseudos using <code>$.expr[':']</code>, which always allows quoted and unquoted arguments.</p></li> <li><p>Consistency and ease of porting to their method counterparts <code>.not()</code> and <code>.has()</code> (just remove or split the outer quotes and change colons to periods?).</p></li> </ul> <p>But I can't find any sources to support or oppose them. In fact, the ability to quote selector arguments itself isn't documented anywhere either, nor does there appear to be any difference between quoting and not quoting the argument:</p> <pre><code>$('div:not(span)') $('span:has(span)') </code></pre>
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    1. COThis is likely a quirk of [Sizzle](http://sizzlejs.com/), not of jQuery itself.
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    2. CO@BoltClock Sorry my example was bad, I think sole purpose of quotes is escaping.
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    3. COIt's probably for consistency in the implementation of `$.expr[':']`.
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