jQuery - what is the feature of this selector rule?
<p>I saw the following usage of jQuery selector:</p>

<pre><code>$('[value=""]', event.target).remove(); 
</code></pre>

<p>I can guess the meaning of this statement is to remove the option value="" from the selector event.target.</p>

<p>The pattern looks like $(A, B).
What kind of selector rule is used here in jQuery?</p>

<p>Thank you</p>
