JSFiddle - React, Tailwind, and code Playground
JavaScript
var $sel = $("<select>").attr("multiple", "multiple")
.appendTo('body');
// This doesn't work either
$sel[0].multiple = true;
// should be select-multiple
$('body').append( "<br>" + $sel[0].multiple + "<br>" + $sel[0].type + "<br>");
// This works
$("<select multiple='multiple'>").appendTo('body');