Let the browser do the work. :scope in QSA refers to the node you're calling it on; siblings excludes el; and finally, a selector other than a simple selector won't match anything anyway because:
In jQuery, $('li.second').siblings('ul > li') would return an empty set - li.second doesn't have any ul siblings, nor are it's descendants siblings of it, so supporting anything but a simple selector is moot.
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Let the browser do the work.
:scopein QSA refers to the node you're calling it on;siblingsexcludesel; and finally, a selector other than a simple selector won't match anything anyway because:In jQuery,
$('li.second').siblings('ul > li')would return an empty set -li.seconddoesn't have anyulsiblings, nor are it's descendants siblings of it, so supporting anything but a simple selector is moot.