如何在绝对元素内的文本前垂直对齐？

Question

我正在尝试垂直对齐用 :before CSS 编写的中间文本。我想不通。

似乎是重复的，但我已经尝试了我找到的所有内容。也许我写错了，但我认为这个案例还没有涉及：绝对元素+文本之前。

这是我目前的情况：

.element {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  border: 3px solid black;
  border-radius: 5px;
  text-align: center;
  height: inherit;
  background-color: rgba(0, 0, 0, 0.2);
}
.element:before {
  content: "Some text to align vertically";
  vertical-align: middle;
}

<div class="element"></div>

Answer 1

display flex 或 table 很容易做到：

html,
body,
.element {
  height: 100%;
  width: 100%;
  margin:0;
  border-collapse:collapse;
  box-sizing:border-box;
}
.element {
  position: absolute;
  display: table;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  border: 3px solid black;
  border-radius: 5px;
  text-align: center;
  height: inherit;
  background-color: rgba(0, 0, 0, 0.2);
}
.element:before {
  content: "Some text to align vertically";
  display: table-cell;
  vertical-align: middle;
}

<div class="element"></div>

弹性

.element {
  position: absolute;
  display: flex;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  border: 3px solid black;
  border-radius: 5px;
  text-align: center;
  height: inherit;
  background-color: rgba(0, 0, 0, 0.2);
  align-items:center;
  justify-content:center;
}
.element:before {
  content: "Some text to align vertically";
  }

<div class="element"></div>

或

.element {
  position: absolute;
  display: flex;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0;
  border: 3px solid black;
  border-radius: 5px;
  text-align: center;
  height: inherit;
  background-color: rgba(0, 0, 0, 0.2);
}
.element:before {
  content: "Some text to align vertically";
  margin:auto;
  }

<div class="element"></div>

如何在绝对元素内的文本前垂直对齐？

How to vertically align before text inside absolute element?

css

vertical-alignment