backdrop-filter CSS 属性可以让你为一个元素后面区域添加图形效果（如模糊或颜色偏移）。因为它适用于元素背后的所有元素，为了看到效果，必须使元素或其背景至少部分透明。

{{InteractiveExample("CSS Demo: backdrop-filter()")}}

```css interactive-example-choice backdrop-filter: blur(10px);

```css interactive-example-choice
backdrop-filter: invert(80%);

```css interactive-example-choice backdrop-filter: sepia(90%);

```html interactive-example
<section class="default-example" id="default-example">
  <div class="example-container">
    <div id="example-element">Example</div>
  </div>
</section>

```css interactive-example .example-container { background-image: url("/shared-assets/images/examples/balloon.jpg"); background-size: cover; width: 200px; height: 200px; display: flex; align-items: center; justify-content: center; color: black; }

example-element {

font-weight: bold; flex: 1; text-align: center; padding: 20px 10px; background-color: rgba(255, 255, 255, 0.2); }

## 语法

```css
/* 关键词值 */
backdrop-filter: none;

/* 指向 SVG 滤镜的 URL */
backdrop-filter: url(commonfilters.svg#filter);

/* <filter-function> 值 */
backdrop-filter: blur(2px);
backdrop-filter: brightness(60%);
backdrop-filter: contrast(40%);
backdrop-filter: drop-shadow(4px 4px 10px blue);
backdrop-filter: grayscale(30%);
backdrop-filter: hue-rotate(120deg);
backdrop-filter: invert(70%);
backdrop-filter: opacity(20%);
backdrop-filter: sepia(90%);
backdrop-filter: saturate(80%);

/* 多重滤镜 */
backdrop-filter: url(filters.svg#filter) blur(4px) saturate(150%);

/* 全局值 */
backdrop-filter: inherit;
backdrop-filter: initial;
backdrop-filter: revert;
backdrop-filter: revert-layer;
backdrop-filter: unset;

值

• none
  • : 没有应用于背景的滤镜。
• <filter-value-list>
  • : 以空格分隔的 {{cssxref("<filter-function>")}} 或是要应用到背景上的 SVG 滤镜。CSS 的 <filter-function> 包括 {{CSSxRef("filter-function/blur", "blur()")}}、{{CSSxRef("filter-function/brightness", "brightness()")}}、{{CSSxRef("filter-function/contrast", "contrast()")}}、{{CSSxRef("filter-function/drop-shadow", "drop-shadow()")}}、{{CSSxRef("filter-function/grayscale", "grayscale()")}}、{{CSSxRef("filter-function/hue-rotate", "hue-rotate()")}}、{{CSSxRef("filter-function/invert", "invert()")}}、{{CSSxRef("filter-function/opacity", "opacity()")}}、{{CSSxRef("filter-function/saturate", "saturate()")}} 和 {{CSSxRef("filter-function/sepia", "sepia()")}}。

形式定义

{{cssinfo}}

形式语法

{{csssyntax}}

示例

CSS

.box {
  background-color: rgb(255 255 255 / 30%);
  backdrop-filter: blur(10px);
}

body {
  background-image: url("anemones.jpg");
}

```css hidden html, body { height: 100%; width: 100%; }

.container { background-size: cover; align-items: center; display: flex; justify-content: center; height: 100%; width: 100%; } .box { border-radius: 5px; font-family: sans-serif; text-align: center; max-width: 50%; max-height: 50%; padding: 20px 40px; }

### HTML

```html
<div class="container">
  <div class="box">
    <p>backdrop-filter: blur(10px)</p>
  </div>
</div>

结果

{{EmbedLiveSample("示例", 600, 400)}}