元素之间的CSS伪元素

Question

是否可以使用CSS伪元素:after或:before清除元素之间的浮点数？还是有另一种方法,我可以明确的花车<div class="float">和<section class="inner">？

HTML和CSS看起来像这样:

* {
  margin: 0;
  padding: 0;
}
*, *:before, *:after {
    box-sizing: border-box;
}
section.wrap {
  width: 100%;
}
section.wrap:after {
  content: '';
  display: block;
  clear: both;
}

div {
  width: 33.33%;
  height: 40px;
  background-color: powderblue;
  float: left;
  border-top: solid 0px white;
  border-right: solid 5px white;
  border-bottom: solid 5px white;
  border-left: solid 0px white;
}

div:nth-of-type(3n + 3) {
    border-right: 0;
}

<section class="wrap">
    <div class="float"></div>
    <div class="float"></div>
    <div class="float"></div>
    <div class="float"></div>
    <div class="float"></div>
    <div class="float"></div>
    <div class="float"></div>
    <div class="float"></div>
    <div class="float"></div>
    <div class="float"></div>

    <!-- CLEAR FLOAT HERE -->

    <section class="inner">
        Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.
    </section>
</section>

Answer 1

当然clear: both还是clear: left:

.inner {
    clear: both;
}