Why does data-fas-classes exist in the https://mdbootstrap.com/docs/jquery/forms/select/#select-options-and-attributes page? How do you use this?

Any one interested? I did this:
var theOptions3 = [];
$('.select option').each(function( index ) {
var theHTMLString = $( this ).data('content');
var theObject = new Object();
console.log(JSON.stringify(theObject));
theOptions3.push(theObject);
console.log( index + ": " + $( this ).data('content') );
});
$('.mdb-select ul.dropdown-content li').each(function( index ){
var theInsert = theOptions3[index].html;
$(this).find('span').html(theInsert);
});