如何创建一个“工具提示尾”使用纯CSS？

我刚刚碰到一个整洁的CSS技巧。检查出来...

I just came across a neat CSS trick. Check out the fiddle...

.tooltiptail {
  display: block;
  border-color: #ffffff #a0c7ff #ffffff #ffffff;
  border-style: solid;
  border-width: 20px;
  width: 0px;
  height: 0px;
}
.anothertail {
  background-image: url(http://static.jqueryfordesigners.com/demo/images/coda/bubble-tail2.png);
  display: block;
  height: 29px;
  width: 30px;
}

<div>Cool Trick:
  <br />
  <div class="tooltiptail"></div>
</div>
<br />

<div>How do I get this effect with only CSS?
  <br />
  <div class="anothertail"></div>
</div>

这会创建一个小箭头/三角形效果，一个工具提示尾。这打击了我的心！ 我真的很想知道这是如何工作的？

This creates a little arrow/triangle-like effect, a "tooltip tail". This blows my mind! I'm really interested in knowing how this works?!

此外，有一种方法来扩展这个CSS技巧创建一个效果如下：

Further, is there a way to extend this CSS trick to create an effect as follows:

>

这是一个有趣的问题。可以使用CSS忽略阴影吗？

This is an interesting problem. Can this be done using only CSS, ignoring the shadow for now?

我想出了一个解决我的初始问题。这是小提琴...

I figured out a solution to my initial question. Here's the fiddle...

http：// jsfiddle.net/duZAx/7/

HTML

<div style="position: relative;">Cool Trick:<br />
    <div class="tooltiptail"></div>
    <div class="tooltiptail2"></div>
</div>

CSS

.tooltiptail {
    display: block;
    border-color: #ffffff #a0c7ff #ffffff #ffffff;
    border-style: solid;
    border-width: 20px;
    width: 0px;
    height: 0px;
}
.tooltiptail2 {
    display: block;
    border-color: transparent #ffffff transparent transparent;
    border-style: solid;
    border-width: 18px;
    width: 0px;
    height: 0px;
    position: relative;
    left: 4px;
    top: -38px;
}

现在，我如何使用纯CSS阴影并与跨浏览器兼容？

Now, how do I exactly mimic the little picture above using pure CSS, including the shadow and having it cross-browser compatible?

这里是我的答案下面的组合后的解决方案。我没有测试它在多个浏览器，但它看起来不错的Chrome。

Here's my solution after a combination of the answers below. I haven't tested it across multiple browsers, but it looks great in Chrome.

http://jsfiddle.net/ UnsungHero97 / MZXCj / 688 /

HTML

<div id="toolTip">
    <p>i can haz css tooltip</p>
    <div id="tailShadow"></div>
    <div id="tail1"></div>
    <div id="tail2"></div>
</div>

CSS

#toolTip {
    background-color: #ffffff;
    border: 1px solid #73a7f0;
    width: 200px;
    height: 100px;
    margin-left: 32px;
    position:relative;
    border-radius: 4px;
    -moz-border-radius: 4px;
    -webkit-border-radius: 4px;
    box-shadow: 0px 0px 8px -1px black;
    -moz-box-shadow: 0px 0px 8px -1px black;
    -webkit-box-shadow: 0px 0px 8px -1px black;
}

#toolTip p {
    padding:10px;
}

#tailShadow {
    background-color: transparent;
    width: 4px;
    height: 4px;
    position: absolute;
    top: 16px;
    left: -8px;
    z-index: -10;
    box-shadow: 0px 0px 8px 1px black;
    -moz-box-shadow: 0px 0px 8px 1px black;
    -webkit-box-shadow: 0px 0px 8px 1px black;
}

#tail1 {
    width: 0px;
    height: 0px;
    border: 10px solid;
    border-color: transparent #73a7f0 transparent transparent;
    position:absolute;
    top: 8px;
    left: -20px;
}

#tail2 {
    width: 0px;
    height: 0px;
    border: 10px solid;
    border-color: transparent #ffffff transparent transparent;
    position:absolute;
    left: -18px;
    top: 8px;
}