perspective

该perspective CSS属性决定在z = 0平面和用户之间的距离以便使所述3D定位的元素一些透视效果。z> 0的每个3D元素变大;，每个z <0的三维元素则变小。效果的强度由此属性的值决定。

/* Keyword value */
perspective: none;

/* <length> values */
perspective: 20px;  
perspective: 3.5em;

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

在用户后面的3D元素的部分，即z轴坐标大于perspectiveCSS属性的值的那部分，不会被绘制。

消失点（vanishing point）默认放置在元件的中心，但它的位置可以使用perspective-origin属性改变。

当此属性的值不为0和none时，就能使用该属性创建新的堆叠上下文。而且，在这种情况下，对象将作为它包含的position: fixed元素的包含块。

Initial value	none
Applies to	transformable elements
Inherited	no
Media	visual
Computed value	the absolute length or none
Animation type	a length
Canonical order	the unique non-ambiguous order defined by the formal grammar
Creates stacking context	yes

语法

可能值

none——是一个关键字，指示不需要应用透视变换。

形式语法

none | <length>

实例

HTML内容

<table>
  <tbody>
    <tr>
      <th><code>perspective: 250px;</code>
      </th>
      <th><code>perspective: 350px;</code>
      </th>
      <th><code>perspective: 500px;</code>
      </th>
    </tr>
    <tr>
      <td>
        <div class="container">
          <div class="cube pers250">
            <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 pers350">
            <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 pers500">
            <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内容

/* Shorthand classes for different perspective values */
.pers250 {
  perspective: 250px;
}

.pers350 {
  perspective: 350px;
}

.pers500 {
  perspective: 500px;
}

/* Define the container div, the cube div, and a generic face */
 .container {
  width: 200px;
  height: 200px;
  margin: 75px 0 0 75px;
  border: none;
}

.cube {
  width: 100%;
  height: 100%;
  backface-visibility: visible;
  perspective-origin: 150% 150%;
  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
}

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

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

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

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

.bottom {
  background: rgba(196, 0, 196, 0.7
  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

Specification	Status	Comment
CSS Transforms Level 2The definition of 'perspective' in that specification.	Editor's Draft	Initial definition

浏览器兼容性

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari (WebKit)
Basic support	12-webkit10 (10) 45	(Yes)-webkit (Yes)	10 (10)-moz 16 (16)1	10	15-webkit	(Yes)-webkit

Feature	Android	Edge	Firefox Mobile (Gecko)	IE Phone	Opera Mobile	Safari Mobile
Basic support	3.0-webkit	(Yes)-webkit (Yes)	10.0 (10)-moz 16.0 (16)1	8.1	(Yes)-webkit	(Yes)-webkit