how to make " " word-wrap on chrome

this is my code :

<div id="a" style="position:absolute;top:300px;width:100px;height:100px;background:red;color:black;word-wrap:break-word;">
    <div id='a2' contenteditable=true >
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    </div>
</div>

this code word-wrap in firefox , but in chrome i cant word-wrap,

so how to make   word-wrap on chrome ?

thanks