html,css实现问号提示信息

问题：如何使用html,css实现问号提示信息？不使用js

解决：使用hint.css或自己写

方法：

方法一：

使用hint.css
http://kushagragour.in/lab/hint/

方法二：

<div id="content">
    <div class="help-tip">
        <p>This is the inline help tip! You can explain to your users what this section of your web app is about.</p>
    </div>
    <p>此代码共3种演示效果，请点击上面的按钮进行切换。</p>
    <p>鼠标移到右侧的“？”问号上查看效果。</p>
</div>

css：

#content{
    background-color: #FFF;
    border-radius: 4px;
    padding: 40px;
    margin: 0 auto;
    max-width: 600px;
    position: relative;
    margin: 0 auto 100px;
}
.help-tip{
    position: absolute;
    top: 18px;
    right: 18px;
    text-align: center;
    background-color: #BCDBEA;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    font-size: 14px;
    line-height: 26px;
    cursor: default;
}
.help-tip:before{
    content:'?';
    font-weight: bold;
    color:#fff;
}
.help-tip:hover p{
    display:block;
    transform-origin: 100% 0%;
    -webkit-animation: fadeIn 0.3s ease-in-out;
    animation: fadeIn 0.3s ease-in-out;
}
.help-tip p{
    display: none;
    text-align: left;
    background-color: #1E2021;
    padding: 20px;
    width: 300px;
    position: absolute;
    border-radius: 3px;
    box-shadow: 1px 1px 1px rgba(0, 0, 0, 0.2);
    right: -4px;
    color: #FFF;
    font-size: 13px;
    line-height: 1.4;
}
.help-tip p:before{
    position: absolute;
    content: '';
    width:0;
    height: 0;
    border:6px solid transparent;
    border-bottom-color:#1E2021;
    right:10px;
    top:-12px;
}
.help-tip p:after{
    width:100%;
    height:40px;
    content:'';
    position: absolute;
    top:-40px;
    left:0;
}

参考：

http://sc.chinaz.com/jiaobendemo.aspx?downloadid=1481591154771