<DIV><LABEL></DIV>
<DIV>check console</DIV></LABEL>
<div>
<label></label>
</div>
<label>
<div>check console</div>
</label>
<div>
<label></label>
</div>
<div>check console</div>
// https://github.com/jquery/jquery/blob/2982abbb13454bd4bdf0299f1183fb0d8c02f02d/src/traversing.js#L209
children: function( elem ) {
return jQuery.sibling( elem.firstChild );
},
// ie9
$.sibling(document.body.firstChild)
[object HTMLDivElement],[object HTMLLabelElement]
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