function ChangeBoxAlign(x)
var boxAlign=x.options[x.selectedIndex].text;
var div=document.getElementById("myDiv");
if (div.style.MozBoxAlign!==undefined)
div.style.MozBoxAlign=boxAlign;
else if (div.style.webkitBoxAlign!==undefined)
div.style.webkitBoxAlign=boxAlign;
else if (div.style.msFlexAlign!==undefined)
div.style.msFlexAlign=boxAlign;
alert("Your browser doesn't support this example!");
<div class="box" id="myDiv">
<select onchange="ChangeBoxAlign (this);" size="6">
<option selected="selected" />baseline
<p><b>Note:</b> This example does not work in Opera, or Internet Explorer 9 and earlier.</p>