empty selector
Description: Select all elements that have no children (including text nodes).
version added: 1.0jQuery( ":empty" )
This is the inverse of :parent.
One important thing to note with :empty (and :parent) is that child elements include text nodes.
The W3C recommends that the <p> element have at least one child node, even if that child is merely text (see https://www.w3.org/TR/html401/struct/text.html#edef-P). Some other elements, on the other hand, are empty (i.e. have no children) by definition: <input>, <img>, <br>, and <hr>, for example.
Example:
Finds all elements that are empty - they don't have child elements or text.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>empty demo</title>
<style>
td {
text-align: center;
}
</style>
<script src="https://code.jquery.com/jquery-3.5.0.js"></script>
</head>
<body>
<table border="1">
<tr><td>TD #0</td><td></td></tr>
<tr><td>TD #2</td><td></td></tr>
<tr><td></td><td>TD#5</td></tr>
</table>
<script>
$( "td:empty" )
.text( "Was empty!" )
.css( "background", "rgb(255,220,200)" );
</script>
</body>
</html>