使用word-wrap:break-word属性以及所需的宽度。主要是, 宽度以像素为单位，而不是百分比。

width: 200px;
word-wrap: break-word;

试试这个

div {display: inline;}

将此CSS添加到段落中。

width:420px; 
min-height:15px; 
height:auto!important; 
color:#666; 
padding: 1%; 
font-size: 14px; 
font-weight: normal;
word-wrap: break-word; 
text-align: left;

<p style="word-wrap: break-word; word-break: break-all;">
    Adsdbjf bfsi hisfsifisfsifs shifhsifsifhis aifoweooweoweweof
</p>

在HTML正文中尝试:

<table>
    <tr>
        <td>
            <div style="word-wrap: break-word; width: 800px">
                Hello world, how are you? More text here to see if it wraps after a long while of writing and it does on Firefox but I have not tested it on Chrome yet. It also works wonders if you have a medium to long paragraph. Just avoid writing in the CSS file that the words have to break-all, that's a small tip.
            </div>
        </td>
    </tr>
</table>

在CSS正文尝试:

background-size: auto;

table-layout: fixed;

试试这个:

div {
    width: 200px;
    word-wrap: break-word;
}