How can the issue of missing output be addressed when using the marquee tag in PHP?

When using the marquee tag in PHP, the issue of missing output may occur if the content inside the marquee tag is not properly echoed or printed. To address this issue, make sure to use echo or print to output the content inside the marquee tag.

<?php
$content = "This is the content inside the marquee tag";
echo "<marquee>$content</marquee>";
?>