如果我明白你想要的东西那样:http://jsfiddle.net/xckL79he/4/?
我用第二个div来做这个,因为主要的问题是.box有一个定义的宽度,所以伪元素在宽度上会有相同的:100%; 第一个解决方案与伪,第二个与背景梯度(我认为不太安全)。
这里是小提琴
HTML
<section>
<div class="wrap">
<div class="boxContainer">
<div class="box">Plop</div>
</div>
<br /><br />
<div class="boxContainerGradient">
<div class="box">Plop</div>
</div>
</div>
</section>
CSS
section {
padding-top:4rem;
width:100%;
background-color: green;
height:40rem;
}
.wrap {
background-color:red;
width: 50rem;
margin: 0 auto;
height: 40rem;
}
.boxContainer{
position:relative;
}
.boxContainer::before {
content: "";
position:absolute;
background-color:blue;
top:0;
right:0;
width: 50%;
height:100%;
}
.box{
height: 3.5rem;
line-height: 3.5rem;
position:relative;
text-align: left;
margin:auto;
width:15rem;
}
.boxContainerGradient{
/* IE9 SVG, needs conditional override of 'filter' to 'none' */
background: url(data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0iMS4wIiA/Pgo8c3ZnIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgd2lkdGg9IjEwMCUiIGhlaWdodD0iMTAwJSIgdmlld0JveD0iMCAwIDEgMSIgcHJlc2VydmVBc3BlY3RSYXRpbz0ibm9uZSI+CiAgPGxpbmVhckdyYWRpZW50IGlkPSJncmFkLXVjZ2ctZ2VuZXJhdGVkIiBncmFkaWVudFVuaXRzPSJ1c2VyU3BhY2VPblVzZSIgeDE9IjAlIiB5MT0iMCUiIHgyPSIxMDAlIiB5Mj0iMCUiPgogICAgPHN0b3Agb2Zmc2V0PSIwJSIgc3RvcC1jb2xvcj0iIzAwMDBmZiIgc3RvcC1vcGFjaXR5PSIwIi8+CiAgICA8c3RvcCBvZmZzZXQ9IjQ5JSIgc3RvcC1jb2xvcj0iIzAwMDBmZiIgc3RvcC1vcGFjaXR5PSIwIi8+CiAgICA8c3RvcCBvZmZzZXQ9IjUwJSIgc3RvcC1jb2xvcj0iIzAwMDBmZiIgc3RvcC1vcGFjaXR5PSIxIi8+CiAgICA8c3RvcCBvZmZzZXQ9IjEwMCUiIHN0b3AtY29sb3I9IiMwMDAwZmYiIHN0b3Atb3BhY2l0eT0iMSIvPgogIDwvbGluZWFyR3JhZGllbnQ+CiAgPHJlY3QgeD0iMCIgeT0iMCIgd2lkdGg9IjEiIGhlaWdodD0iMSIgZmlsbD0idXJsKCNncmFkLXVjZ2ctZ2VuZXJhdGVkKSIgLz4KPC9zdmc+);
background: -moz-linear-gradient(left, rgba(0,0,255,0) 0%, rgba(0,0,255,0) 49%, rgba(0,0,255,1) 50%, rgba(0,0,255,1) 100%); /* FF3.6+ */
background: -webkit-gradient(linear, left top, right top, color-stop(0%,rgba(0,0,255,0)), color-stop(49%,rgba(0,0,255,0)), color-stop(50%,rgba(0,0,255,1)), color-stop(100%,rgba(0,0,255,1))); /* Chrome,Safari4+ */
background: -webkit-linear-gradient(left, rgba(0,0,255,0) 0%,rgba(0,0,255,0) 49%,rgba(0,0,255,1) 50%,rgba(0,0,255,1) 100%); /* Chrome10+,Safari5.1+ */
background: -o-linear-gradient(left, rgba(0,0,255,0) 0%,rgba(0,0,255,0) 49%,rgba(0,0,255,1) 50%,rgba(0,0,255,1) 100%); /* Opera 11.10+ */
background: -ms-linear-gradient(left, rgba(0,0,255,0) 0%,rgba(0,0,255,0) 49%,rgba(0,0,255,1) 50%,rgba(0,0,255,1) 100%); /* IE10+ */
background: linear-gradient(to right, rgba(0,0,255,0) 0%,rgba(0,0,255,0) 49%,rgba(0,0,255,1) 50%,rgba(0,0,255,1) 100%); /* W3C */
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#000000ff', endColorstr='#0000ff',GradientType=1); /* IE6-8 */
}
守则 “*我想伸展,直到页面的一个边界的元素。*”。我不知道你想说什么。你能解释这更简单吗? – 2014-09-11 13:41:57
你在哪里阅读过webkit浏览器中的“溢出”问题? – 2014-09-11 13:44:21
@NicoO我只是想说,蓝色框被拉长到右边的页面边界,就像这里http://codepen.io/rpkoller/pen/jkuxa。但是我的目标是在没有溢出隐藏属性的情况下以及在我的评论中的笔中伪元素上的广泛的大宽度。 – rpk 2014-09-11 14:14:13