perspective-origin

这是一种实验技术

由于该技术的规范不稳定，请查看各种浏览器的兼容性表格以查阅用法。另外请注意，随着规范的变化，实验技术的语法和行为在未来版本的浏览器中可能会发生变化。

该perspective-origin CSS属性决定了观察者所处的位置。它被perspective属性用作消失点（vanishing point ）。

/* One-value syntax */
perspective-origin: x-position;

/* Two-value syntax */
perspective-origin: x-position y-position;

/* When both x-position and y-position are keywords,
   the following is also valid */
perspective-origin: y-position x-position;

/* Global values */
perspective-origin: inherit;
perspective-origin: initial;
perspective-origin: unset;

语法

可能值

x-position指示消失点的横坐标的位置。它可以具有以下值之一：

• <length-percentage>将该位置指示为绝对长度值或相对于元素的宽度。它的值可能是负的。

• left，一个关键字为表示0长度值的快捷方式。

• center，该关键字为表示50%百分比值的快捷方式。

• right，该关键字为表示100%百分比值的快捷方式。

y-position指示消失点的纵坐标。它可以具有以下值之一：

• <length-percentage>将该位置指示为绝对长度值或相对于元素的高度。它的值可能是负的。

• top，该关键字为表示0长度值的快捷方式。

• center，该关键字为表示50%百分比值的快捷方式。

• bottom，该关键字为表示100%百分比值的快捷方式。

形式语法

<position>where 
<position> = [[ left | center | right | top | bottom | <length-percentage> ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ] | [ center | [ left | right ] <length-percentage>? ] && [ center | [ top | bottom ] <length-percentage>? ]]
where 
<length-percentage> = <length> | <percentage>

实例

此示例显示具有常用perspective-origin值的多维数据集。

HTML

<table>
  <tbody>
    <tr>
      <th>
        <code>perspective-origin: top left;</code>
      </th>
      <th>
        <code>perspective-origin: top;</code>
      </th>
      <th>
        <code>perspective-origin: top right;</code>
      </th>
    </tr>
    <tr>
      <td>
        <div class="container">
          <div class="cube potl">
            <div class="face front">1</div>
            <div class="face back">2</div>
            <div class="face right">3</div>
            <div class="face left">4</div>
            <div class="face top">5</div>
            <div class="face bottom">6</div>
          </div>
        </div>
      </td>
      <td>
        <div class="container">
          <div class="cube potm">
            <div class="face front">1</div>
            <div class="face back">2</div>
            <div class="face right">3</div>
            <div class="face left">4</div>
            <div class="face top">5</div>
            <div class="face bottom">6</div>
          </div>
        </div>
      </td>
      <td>
        <div class="container">
          <div class="cube potr">
            <div class="face front">1</div>
            <div class="face back">2</div>
            <div class="face right">3</div>
            <div class="face left">4</div>
            <div class="face top">5</div>
            <div class="face bottom">6</div>
          </div>
        </div>
      </td>
    </tr>
    <tr>
      <th>
        <code>perspective-origin: left;</code>
      </th>
      <th>
        <code>perspective-origin: 50% 50%;</code>
      </th>
      <th>
        <code>perspective-origin: right;</code>
      </th>
    </tr>
    <tr>
      <td>
        <div class="container">
          <div class="cube poml">
            <div class="face front">1</div>
            <div class="face back">2</div>
            <div class="face right">3</div>
            <div class="face left">4</div>
            <div class="face top">5</div>
            <div class="face bottom">6</div>
          </div>
        </div>
      </td>
      <td>
        <div class="container">
          <div class="cube pomm">
            <div class="face front">1</div>
            <div class="face back">2</div>
            <div class="face right">3</div>
            <div class="face left">4</div>
            <div class="face top">5</div>
            <div class="face bottom">6</div>
          </div>
        </div>
      </td>
      <td>
        <div class="container">
          <div class="cube pomr">
            <div class="face front">1</div>
            <div class="face back">2</div>
            <div class="face right">3</div>
            <div class="face left">4</div>
            <div class="face top">5</div>
            <div class="face bottom">6</div>
          </div>
        </div>
      </td>
    </tr>
    <tr>
      <th>
        <code>perspective-origin: bottom left;</code>
      </th>
      <th>
        <code>perspective-origin: bottom;</code>
      </th>
      <th>
        <code>perspective-origin: bottom right;</code>
      </th>
    </tr>
    <tr>
      <td>
        <div class="container">
          <div class="cube pobl">
            <div class="face front">1</div>
            <div class="face back">2</div>
            <div class="face right">3</div>
            <div class="face left">4</div>
            <div class="face top">5</div>
            <div class="face bottom">6</div>
          </div>
        </div>
      </td>
      <td>
        <div class="container">
          <div class="cube pobm">
            <div class="face front">1</div>
            <div class="face back">2</div>
            <div class="face right">3</div>
            <div class="face left">4</div>
            <div class="face top">5</div>
            <div class="face bottom">6</div>
          </div>
        </div>
      </td>
      <td>
        <div class="container">
          <div class="cube pobr">
            <div class="face front">1</div>
            <div class="face back">2</div>
            <div class="face right">3</div>
            <div class="face left">4</div>
            <div class="face top">5</div>
            <div class="face bottom">6</div>
          </div>
        </div>
      </td>
    </tr>
  </tbody>
</table>

CSS

/* Shorthand classes for perspective-origin values */
.potl {
  perspective-origin: top left;
  -webkit-perspective-origin: top left;
}

.potm {
  perspective-origin: top;
  -webkit-perspective-origin: top;
}

.potr {
  perspective-origin: top right;
  -webkit-perspective-origin: top right;
}

.poml {
  perspective-origin: left;
  -webkit-perspective-origin: left;
}

.pomm {
  perspective-origin: 50% 50%;
  -webkit-perspective-origin: 50% 50%;
}

.pomr {
  perspective-origin: right;
  -webkit-perspective-origin: right;
}

.pobl {
  perspective-origin: bottom left;
  -webkit-perspective-origin: bottom left;
}

.pobm {
  perspective-origin: bottom;
  -webkit-perspective-origin: bottom;
}

.pobr {
  perspective-origin: bottom right;
  -webkit-perspective-origin: bottom right;
}

/* Define the container div, the cube div, and a generic face */
.container {
  width: 100px;
  height: 100px;
  margin: 24px;
  border: none;
}

.cube {
  width: 100%;
  height: 100%;
  backface-visibility: visible;
  perspective: 300px;
  transform-style: preserve-3d;
  -webkit-backface-visibility: visible;
  -webkit-perspective: 300px;
  -webkit-transform-style: preserve-3d;
}

.face {
  display: block;
  position: absolute;
  width: 100px;
  height: 100px;
  border: none;
  line-height: 100px;
  font-family: sans-serif;
  font-size: 60px;
  color: white;
  text-align: center;
}

/* Define each face based on direction */
.front {
  background: rgba(0, 0, 0, 0.3);
  transform: translateZ(50px);
  -webkit-transform: translateZ(50px);
}

.back {
  background: rgba(0, 255, 0, 1);
  color: black;
  transform: rotateY(180deg) translateZ(50px);
  -webkit-transform: rotateY(180deg) translateZ(50px);
}

.right {
  background: rgba(196, 0, 0, 0.7);
  transform: rotateY(90deg) translateZ(50px);
  -webkit-transform: rotateY(90deg) translateZ(50px);
}

.left {
  background: rgba(0, 0, 196, 0.7);
  transform: rotateY(-90deg) translateZ(50px);
  -webkit-transform: rotateY(-90deg) translateZ(50px);
}

.top {
  background: rgba(196, 196, 0, 0.7);
  transform: rotateX(90deg) translateZ(50px);
  -webkit-transform: rotateX(90deg) translateZ(50px)
}

.bottom {
  background: rgba(196, 0, 196, 0.7);
  transform: rotateX(-90deg) translateZ(50px);
  -webkit-transform: rotateX(-90deg) translateZ(50px);
}

/* Make the table a little nicer */
th, p, td {
  background-color: #EEEEEE;
  padding: 10px;
  font-family: sans-serif;
  text-align: left;
}

结果

规范围

浏览器兼容性