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[CSS] Target empty elements using the :empty pseudo-class

You can target an element that has no child elements by using the :empty pseudo-class. With browser support down to IE9, it‘s solid, easy way to select empty elements without any additional markup.

Be aware that whitespace is considered a "child", so :empty will not work if the element has no children, but has space between the opening and closing tags.

 

<!DOCTYPE html><html><head>  <link href="https://fonts.googleapis.com/css?family=Work+Sans" rel="stylesheet">  <link rel="stylesheet" href="style.css"></head><body>  <div class="Alert">    <p>Success! Your profile has been updated.</p>  </div>    <!-- This empty alert box won‘t be show-->  <div class="Alert"></div></body></html>
.Alert:not(:empty) {  border: 3px solid darkgreen;  margin: 1em;  padding: 1em;  background-color: seagreen;  color: white;  border-radius: 4px;}.Alert:empty{  display:none;}

 

<iframe style="width: 100%; height: 300px;" src="https://run.plnkr.co/6hEGs1GyGcDhDHsQ/" width="320" height="240"></iframe>

[CSS] Target empty elements using the :empty pseudo-class