背面能见度 | backface-visibility (Transforms)

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背面能见度 | backface-visibility (Transforms) - CSS 中文开发手册

这是一种实验技术

由于该技术的规格不稳定，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。

的backface-visibility CSS属性决定面对用户时该元件的背面是否是可见。当设置为可见时，元素的背面始终是透明的背景，而显示出元素正面的镜像。

/* Keyword values */
backface-visibility: visible;
backface-visibility: hidden;

/* Global values */
backface-visibility: inherit;
backface-visibility: initial;
backface-visibility: unset;

语法

有些情况下，我们不希望通过背面看到某个元素的正面，就像做翻卡效果（两个元素并排设置）一样。

此属性对2D变换没有影响，因为没有透视。

Initial value	visible
Applies to	transformable elements
Inherited	no
Media	visual
Computed value	as specified
Animation type	discrete
Canonical order	the unique non-ambiguous order defined by the formal grammar

估计值

visible——此关键字意味着背面可见，允许正面显示为镜像。

hidden——这个关键字意味着背面不可见，隐藏正面。

形式语法

visible | hidden

实例

此示例显示具有透明面的立方体。

HTML内容

<table>
  <tbody>
    <tr>
      <th><code>backface-visibility: visible;</code></th>
      <th><code>backface-visibility: hidden;</code></th>
    </tr>
    <tr>
      <td>
        <div class="container">
          <div class="cube showbf">
            <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>
        <p>
          All the faces are transparent and the three
          back faces are visible through the front ones.
        </p>
      </td>
      <td>
        <div class="container">
          <div class="cube hidebf">
            <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>
        <p>
          No face is opaque, but the three back faces
          are always hidden now.
        </p>
      </td>
    </tr>
  </tbody>
</table>

CSS内容

/* Shorthand classes that will show or hide the
   three back faces of the "cube" */
.hidebf div {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.showbf div {
  backface-visibility: visible;
  -webkit-backface-visibility: visible;
}

/* Define the container div, the cube div, and a generic face */
.container {
   150px;
  height: 150px;
  margin: 75px 0 0 75px;
  border: none;
}

.cube {
   100%;
  height: 100%;
  perspective: 550px;
  perspective-origin: 150% 150%;
  transform-style: preserve-3d;
  -webkit-perspective: 300px;
  -webkit-perspective-origin: 150% 150%;
  -webkit-transform-style: preserve-3d;
}

.face {
  display: block;
  position: absolute;
   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;
  margin: 0px;
  padding: 6px;
  font-family: sans-serif;
  text-align: left;
}

结果

规范

Specification	Status	Comment
CSS Transforms Level 2The definition of 'backface-visibility' 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-webkit	(Yes)-webkit (Yes)	10 (10)-moz 16 (16)1	102	15-webkit	(Yes)-webkit

Feature	Android	Chrome for Android	Edge	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	3.0-webkit	(Yes)-webkit	(Yes)-webkit (Yes)	10.0 (10)-moz 16.0 (16)1	8.1 11-webkit2	(Yes)-webkit	(Yes)-webkit

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