backdrop-filter

CSS backdrop-filter는 요소 뒤 영역에 흐림이나 색상 시프트 등 그래픽 효과를 적용할 수 있는 속성입니다. 요소 "뒤"에 적용하기 때문에, 효과를 확인하려면 요소나 요소의 배경을 적어도 반투명하게는 설정해야 합니다.

/* 키워드 값 */
backdrop-filter: none;

/* SVG 필터를 가리키는 URL */
backdrop-filter: url(commonfilters.svg#filter);

/* <filter-function> 값 */
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%);

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

/* 전역 값 */
backdrop-filter: inherit;
backdrop-filter: initial;
backdrop-filter: unset;

구문

none
뒤에 아무런 필터도 적용하지 않습니다.
<filter-function-list>
뒤에 적용할 <filter-function> 또는 SVG필터의 공백 구분 목록입니다.

형식 정의

초기값none
적용대상all elements; In SVG, it applies to container elements excluding the defs (en-US) element and all graphics elements
상속no
Computed valueas specified
Animation typea filter function list

형식 구문

backdrop-filter = 
none |
<filter-value-list>

<filter-value-list> =
[ <filter-function> | <url> ]+

<filter-function> =
<blur()> |
<brightness()> |
<contrast()> |
<drop-shadow()> |
<grayscale()> |
<hue-rotate()> |
<invert()> |
<opacity()> |
<sepia()> |
<saturate()>

<blur()> =
blur( <length>? )

<brightness()> =
brightness( <number-percentage>? )

<contrast()> =
contrast( <number-percentage>? )

<drop-shadow()> =
drop-shadow( <color>? &&
<length>{2,3} )

<grayscale()> =
grayscale( <number-percentage>? )

<hue-rotate()> =
hue-rotate( [ <angle> | <zero> ]? )

<invert()> =
invert( <number-percentage>? )

<opacity()> =
opacity( <number-percentage>? )

<sepia()> =
sepia( <number-percentage>? )

<saturate()> =
saturate( <number-percentage>? )

<color> =
<absolute-color-base> |
currentcolor |
<system-color> |
<device-cmyk()>

<absolute-color-base> =
<hex-color> (en-US) |
<named-color> |
transparent |
<rgb()> |
<rgba()> |
<hsl()> |
<hsla()> |
<hwb()> |
<lab()> |
<lch()> |
<oklab()> |
<oklch()> |
<color()>

<device-cmyk()> =
device-cmyk( <cmyk-component>{4} [ / <alpha-value> ]? )

<rgb()> =
rgb( [ <percentage> | none ]{3} [ / [ <alpha-value> | none ] ]? ) |
rgb( [ <number> | none ]{3} [ / [ <alpha-value> | none ] ]? )

<hsl()> =
hsl( [ <hue> | none ] [ <percentage> | none ] [ <percentage> | none ] [ / [ <alpha-value> | none ] ]? )

<hwb()> =
hwb( [ <hue> | none ] [ <percentage> | none ] [ <percentage> | none ] [ / [ <alpha-value> | none ] ]? )

<lab()> =
lab( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ / [ <alpha-value> | none ] ]? )

<lch()> =
lch( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <hue> | none ] [ / [ <alpha-value> | none ] ]? )

<oklab()> =
oklab( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ / [ <alpha-value> | none ] ]? )

<oklch()> =
oklch( [ <percentage> | <number> | none ] [ <percentage> | <number> | none ] [ <hue> | none ] [ / [ <alpha-value> | none ] ]? )

<color()> =
color( <colorspace-params> [ / [ <alpha-value> | none ] ]? )

<cmyk-component> =
<number> |
<percentage>

<alpha-value> =
<number> |
<percentage>

<hue> =
<number> |
<angle> |
none

<colorspace-params> =
<predefined-rgb-params> |
<xyz-params>

<predefined-rgb-params> =
<predefined-rgb> [ <number> | <percentage> | none ]{3}

<xyz-params> =
<xyz-space> [ <number> | none ]{3}

<predefined-rgb> =
srgb |
srgb-linear |
display-p3 |
a98-rgb |
prophoto-rgb |
rec2020

<xyz-space> =
xyz |
xyz-d50 |
xyz-d65

예제

CSS

.box {
  background-color: rgba(255, 255, 255, 0.3);
  border-radius: 5px;
  font-family: sans-serif;
  text-align: center;
  line-height: 1;
 -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  max-width: 50%;
  max-height: 50%;
  padding: 20px 40px;
}

html,
body {
  height: 100%;
  width: 100%;
}

body {
  background-image: url(https://picsum.photos/id/1080/6858/4574), linear-gradient(rgb(219, 166, 166), rgb(0, 0, 172));
  background-position: center center;
  background-repeat: no-repeat;
  background-size: cover;
}

.container {
  align-items: center;
  display: flex;
  justify-content: center;
  height: 100%;
  width: 100%;
}

HTML

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

결과

명세

Specification Status Comment
Filter Effects Module Level 2
The definition of 'backdrop-filter' in that specification.
Editor's Draft Initial definition.

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