In a block of CSS code, what is used for styling to apply when the user drags their mouse cursor over a HTML element on a web page code example

Example: cursor as image css

You can use own image or emoji as cursor
<style>       
    a{
        cursor: url("custom.gif"), url("custom.cur"), default;
    }
</style>

<p>Place your mouse pointer <a href="#">over me</a> to reveal the custom cursor.</p>