Why can't I filter out an element by its id using jQuery? -

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try in browser's javascript console:

$('<p><span id="wow">foobar</span></p>').filter('#wow')

what []. why that? isn't supposed filter out span who's id isn't "wow"?

.filter() filters set of matched elements. element in set of elements <p> tag, doesn't match selector.

you want use .find() instead:

> $('<p><span id="wow">foobar</span></p>').find('#wow') [<span id=​"wow">​foobar​</span>​]

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