CSS:当我为段落设置ID时，悬停效果无效

I have the following css3 transition with ease effect:

我有以下css3过渡轻松:

HTML

HTML

<div class="button">     
    <a href="#" onMouseOver="clicksound.playclip()"></a>
    <p id="myId" class="top"></p>            
</div>

CSS

CSS

 * {
     padding: 0;
     margin: 0;
 }
 .button {
     width: 180px;
     margin-top: 45px;
 }
 .button a {
     display: block;
     height: 40px;
     width: 180px;
     /*TYPE*/
     color: black;
     font: 17px/50px Helvetica, Verdana, sans-serif;
     text-decoration: none;
     text-align: center;
     text-transform: uppercase;
 }
 .button a {
     background:url(http://imageshack.com/a/img819/761/dqj.gif);
     margin: -50 0 0 0;
     z-index: -1;
 }
  p#myId {
     background: url(http://imageshack.com/a/img854/1921/9ft3.png);
     display: block;
     height: 40px;
     width: 167px;
     margin: -40px 0 0 5px;
     z-index:-1;
     /*TYPE*/
     text-align: center;
     font: 12px/45px Helvetica, Verdana, sans-serif;
     color: #fff;
     /*POSITION*/
     position: absolute;
     /*TRANSITION*/
     -webkit-transition: margin 0.1s ease;
     -moz-transition: margin 0.1s ease;
     -o-transition: margin 0.1s ease;
     -ms-transition: margin 0.1s ease;
     transition: margin 0.1s ease;
 }
 .button:hover .top {
     margin: -67px 0 0 5px;
     line-height: 35px;
 }
 /*ACTIVE*/
 .button:active .top {
     margin: -70px 0 0 5px;
 }

If I change the p#myId selector to p in CSS, it works (the button goes up on hover), otherwise it won't.

如果我在CSS中将p#myId选择器更改为p，它就会工作(按钮会向上悬停)，否则它不会工作。

Running demo on jsFiddle

上运行演示jsFiddle

1 个解决方案

#1

The problem is that the selector handling your :hover behavior has a lower Specificity than the rule for the default behavior (p#id selector).

问题是处理您的:hover行为的选择器比默认行为的规则(p#id选择器)具有更低的特异性。

Changing this

改变这种

.button:hover .top {

to this

这个

.button:hover #myId.top {

will solve the problem: Running example

解决问题:运行示例?

You can also apply an id to a parent object (lets' say <div id="container">), and then use

还可以对父对象应用id(让我们' say

)，然后使用

#container .button:hover .top {

---

A must-read: Specifics on CSS Specificity

一个必读的:关于CSS特性的细节

Examples:

例子: