Hey Ron,
You can create an onMouse event - in the event you can write a code to set the html of the object.
For example :
export function date_mouseIn(event) {
$w("#element").html = `<h1 style = "color:red"> ${$w("#element).text}</h1>`;
}
In the example the color of the element will become red when you hover on it.
you can also check out this articles: