html - 我如何使用 :before property to create a square before a span

Question

我想在跨度前面创建一个正方形。像这样的 image .

但是我没有成功地使用 span:before 属性创建它。可以用这个来创建吗？如果是，那么有人可以告诉我我该怎么做吗？

我用简单的 CSS 创建了这个。这是我的代码

HTML:

<div id="five_day_table">
    <h3>Annual Cleaning Schedule</h3>
    <div class="r-cl"><span></span>Forecasted Rain Clean</div>
    <div class="m-cl"><span></span>Forecasted Manual Clean</div>
    <div class="cm-cl"><span></span>Completed Manual Clean</div>
    <div class="d-cl"><span></span>Forecasted Dirty Rain</div>
</div>

和CSS

#five_day_table span {
  width: 14px;
  height: 14px;
  display: block;
  float: left;
  margin: 1px 3px 0px 0px;
}
.r-cl span
{
 background:  Blue; 
}
.m-cl span
{
 background:  red; 
}
.cm-cl span
{
 background:  green; 
}
.d-cl span
{
 background:  brown; 
}

这是工作链接。但我只想使用这个 HTML。

<div id="five_day_table">
    <h3>Annual Cleaning Schedule</h3>
    <span class='one'>Forecasted Rain Clean</span>
    <span class='two'>Forecasted Manual Clean</span>
    <span class='three'>Completed Manual Clean</span>
    <span class='four'>Forecasted Dirty Rain</span>
</div>

这怎么可能？

Answer 1

您需要添加 content: "" 才能使 span:before 正常工作

#five_day_table span {
  display: block;
  margin: 1px 3px 0px 0px;
}
span:before {
  content: "";
  display: inline-block;
  width: 15px;
  height: 15px;
  margin-right: 5px;
}
.one:before {
  background: Blue;
}
.two:before {
  background: red;
}
.three:before {
  background: green;
}
.four:before {
  background: brown;
}

<div id="five_day_table">
  <h3>Annual Cleaning Schedule</h3>
  <span class='one'>Forecasted Rain Clean</span>
  <span class='two'>Forecasted Manual Clean</span>
  <span class='three'>Completed Manual Clean</span>
  <span class='four'>Forecasted Dirty Rain</span>

</div>