我有一个网站，我决定用纯CSS片段替换基于jQuery的切换框.当我使用固定高度值进行过渡(CSS的最后几行)时，效果很好，但是如果使用auto值，动画就会丢失，只有高度更改才会生效！
有没有办法将其与自动价值一起使用？我想使用可变文本，没有脚本.
.ac-container{
width: 400px;
margin: 10px auto 30px auto;
text-align: left;
}
.ac-container label{
font-family: 'BebasNeueRegular', 'Arial Narrow', Arial, sans-serif;
padding: 5px 20px;
position: relative;
z-index: 20;
display: block;
height: 30px;
cursor: pointer;
color: #777;
text-shadow: 1px 1px 1px rgba(255,255,255,0.8);
line-height: 33px;
font-size: 19px;
background: #ffffff;
background: -moz-linear-gradient(top, #ffffff 1%, #eaeaea 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(1%,#ffffff), color-stop(100%,#eaeaea));
background: -webkit-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
background: -o-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
background: -ms-linear-gradient(top, #ffffff 1%,#eaeaea 100%);
background: linear-gradient(top, #ffffff 1%,#eaeaea 100%);
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#eaeaea',GradientType=0 );
box-shadow:
0px 0px 0px 1px rgba(155,155,155,0.3),
1px 0px 0px 0px rgba(255,255,255,0.9) inset,
0px 2px 2px rgba(0,0,0,0.1);
}
.ac-container label:hover{
background: #fff;
}
.ac-container input:checked + label,
.ac-container input:checked + label:hover{
background: #c6e1ec;
color: #3d7489;
text-shadow: 0px 1px 1px rgba(255,255,255, 0.6);
box-shadow:
0px 0px 0px 1px rgba(155,155,155,0.3),
0px 2px 2px rgba(0,0,0,0.1);
}
.ac-container input{
display: none;
}
.ac-container section{
background: rgba(255, 255, 255, 0.5);
margin-top: -1px;
overflow: hidden;
height: 0px;
position: relative;
z-index: 10;
-webkit-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
-moz-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
-o-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
-ms-transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
transition: height 0.3s ease-in-out, box-shadow 0.6s linear;
}
.ac-container section p{
font-style: italic;
color: #777;
line-height: 23px;
font-size: 14px;
padding: 20px;
text-shadow: 1px 1px 1px rgba(255,255,255,0.8);
}
.ac-container input:checked ~ section{
-webkit-transition: height 0.5s ease-in-out, box-shadow 0.1s linear;
-moz-transition: height 0.5s ease-in-out, box-shadow 0.1s linear;
-o-transition: height 0.5s ease-in-out, box-shadow 0.1s linear;
-ms-transition: height 0.5s ease-in-out, box-shadow 0.1s linear;
transition: height 0.5s ease-in-out, box-shadow 0.1s linear;
box-shadow: 0px 0px 0px 1px rgba(155,155,155,0.3);
}
.ac-container input:checked ~ section.ac-small{
height: 120px; /*auto*/
}<div class="ac-container">
<div>
<input id="ac-1" name="accordion-1" type="checkbox" />
<section class="ac-small">
<p>Some content... </p>
</section>
<label for="ac-1">About us</label>
</div>
<div>
<input id="ac-2" name="accordion-2" type="checkbox" />
<section class="ac-small">
<p>Some content... </p>
</section>
<label for="ac-2">About us</label>
</div>
</div>