CSS Reference

:active

アクティブになった要素にスタイルを適用する

:active 疑似クラスは閲覧者の操作によってアクティブになった要素にスタイルを適用します。:link、:visited、:hover 各疑似クラスと併用するときは、スタイルを上書きされないように必ず後ろに記述します。

:activeのサンプルソース

a:active {
  background-color: #ffe4b5 ;
}

主要ブラウザの対応

IE11	○
Edge（EdgeHTML）	○
Edge（Chromium）	○
Chrome	○
Firefox	○
Safari	○
iOS Safari	○
Android Chrome	○

仕様書

CSS Level 2（Revision 1）

用途から CSS プロパティやセレクタを探す

用途から CSS プロパティやセレクタを逆引きできます。

@-規則: @charset
@color-profile
@container
@counter-style
@font-feature-values
@font-palette-values
@keyframes
@layer
@property
@scope
@scroll-timeline
@start-style
@supports
メディアクエリ: prefers-color-scheme
コンテナクエリ: container
container-name
container-type
セレクタ: ID セレクタ
クラスセレクタ
タイプセレクタ
ユニバーサルセレクタ
入れ子セレクタ
子セレクタ
子孫セレクタ
属性セレクタ
間接セレクタ
隣接セレクタ
疑似要素: ::after
::backdrop
::before
::cue
::file-selector-button
::first-letter
::first-line
::marker
::part()
::placeholder
::selection
::slotted()
疑似クラス: :active
:any-link
:checked
:default
:defined
:disabled
:empty
:enabled
:first
:first-child
:first-of-type
:focus
:focus-visible
:focus-within
:fullscreen
:has()
:host
:hover
:in-range
:indeterminate
:invalid
:is()
:lang()
:last-child
:last-of-type
:left
:link
:not()
:nth-child()
:nth-last-child()
:nth-last-of-type()
:nth-of-type()
:only-child
:only-of-type
:optional
:out-of-range
:placeholder-shown
:read-only
:read-write
:required
:right
:root
:scope
:state()
:target
:valid
:visited
:where()
CSS関数: acos()
asin()
atan()
atan2()
attr()
calc()
circle()
clamp()
color()
color-mix()
cos()
device-cmyk()
ellipse()
exp()
hypot()
inset()
log()
max()
min()
minmax()
mod()
polygon()
pow()
rem()
round()
sin()
sqrt()
tan()
フォント・テキスト: font-palette
hyphenate-character
hyphens
text-spacing-trim
text-wrap
text-wrap-mode
text-wrap-style
white-space-collapse
色の指定: accent-color
background-color
背景: background
background-color
ボックス: scroll-behavior
ルビ: ruby-align
ruby-position
アニメーション: @keyframes
@scroll-timeline
ユーザーインターフェース: appearance
field-sizing
封じ込め: contain
contain-intrinsic-block-size
contain-intrinsic-height
contain-intrinsic-inline-size
contain-intrinsic-size
contain-intrinsic-width

対応ブラウザから CSS プロパティやセレクタを探す

対応ブラウザから CSS プロパティやセレクタを逆引きできます。

IE11: ::after
::backdrop
::before
::first-letter
::first-line
::selection
:active
:checked
:disabled
:empty
:enabled
:first
:first-child
:first-of-type
:focus
:fullscreen
:hover
:indeterminate
:invalid
:lang()
:last-child
:last-of-type
:left
:link
:not()
:nth-child()
:nth-last-child()
:nth-last-of-type()
:nth-of-type()
:only-child
:only-of-type
:optional
:placeholder-shown
:required
:right
:root
:target
:valid
:visited
@charset
@keyframes
ID セレクタ
attr()
background
background-color
calc()
hyphens
クラスセレクタ
タイプセレクタ
ユニバーサルセレクタ
子セレクタ
子孫セレクタ
属性セレクタ
間接セレクタ
隣接セレクタ
Edge（EdgeHTML）: ::after
::backdrop
::before
::first-letter
::first-line
::placeholder
::selection
:active
:checked
:disabled
:empty
:enabled
:first
:first-child
:first-of-type
:focus
:fullscreen
:hover
:in-range
:indeterminate
:invalid
:lang()
:last-child
:last-of-type
:left
:link
:not()
:nth-child()
:nth-last-child()
:nth-last-of-type()
:nth-of-type()
:only-child
:only-of-type
:optional
:out-of-range
:read-only
:read-write
:required
:right
:root
:target
:valid
:visited
@charset
@keyframes
@supports
ID セレクタ
attr()
background
background-color
calc()
hyphens
minmax()
prefers-color-scheme
クラスセレクタ
タイプセレクタ
ユニバーサルセレクタ
子セレクタ
子孫セレクタ
属性セレクタ
間接セレクタ
隣接セレクタ
Edge（Chromium）: ::after
::backdrop
::before
::cue
::file-selector-button
::first-letter
::first-line
::marker
::part()
::placeholder
::selection
::slotted()
:active
:any-link
:checked
:default
:defined
:disabled
:empty
:enabled
:first
:first-child
:first-of-type
:focus
:focus-visible
:focus-within
:fullscreen
:has()
:host
:hover
:in-range
:indeterminate
:invalid
:lang()
:last-child
:last-of-type
:left
:link
:not()
:nth-child()
:nth-last-child()
:nth-last-of-type()
:nth-of-type()
:only-child
:only-of-type
:optional
:out-of-range
:placeholder-shown
:read-only
:read-write
:required
:right
:root
:scope
:state()
:target
:valid
:visited
@charset
@color-profile
@container
@counter-style
@font-feature-values
@font-palette-values
@keyframes
@layer
@property
@scope
@start-style
@supports
ID セレクタ
accent-color
acos()
appearance
asin()
atan()
atan2()
attr()
background
background-color
calc()
circle()
clamp()
color()
color-mix()
contain
contain-intrinsic-block-size
contain-intrinsic-height
contain-intrinsic-inline-size
contain-intrinsic-size
contain-intrinsic-width
container
container-name
container-type
cos()
ellipse()
exp()
field-sizing
font-palette
hyphenate-character
hyphens
hypot()
inset()
log()
max()
min()
minmax()
mod()
polygon()
pow()
prefers-color-scheme
rem()
round()
ruby-align
ruby-position
scroll-behavior
sin()
sqrt()
tan()
text-spacing-trim
text-wrap
white-space-collapse
クラスセレクタ
タイプセレクタ
ユニバーサルセレクタ
入れ子セレクタ
子セレクタ
子孫セレクタ
属性セレクタ
間接セレクタ
隣接セレクタ
Firefox: ::after
::backdrop
::before
::cue
::file-selector-button
::first-letter
::first-line
::marker
::part()
::placeholder
::selection
::slotted()
:active
:any-link
:checked
:default
:defined
:disabled
:empty
:enabled
:first
:first-child
:first-of-type
:focus
:focus-visible
:focus-within
:fullscreen
:has()
:host
:hover
:in-range
:indeterminate
:invalid
:is()
:lang()
:last-child
:last-of-type
:link
:not()
:nth-child()
:nth-last-child()
:nth-last-of-type()
:nth-of-type()
:only-child
:only-of-type
:optional
:out-of-range
:placeholder-shown
:read-only
:read-write
:required
:root
:scope
:state()
:target
:valid
:visited
:where()
@charset
@color-profile
@container
@counter-style
@font-feature-values
@font-palette-values
@keyframes
@layer
@property
@scroll-timeline
@start-style
@supports
ID セレクタ
accent-color
acos()
appearance
asin()
atan()
atan2()
attr()
background
background-color
calc()
circle()
clamp()
color()
color-mix()
contain
contain-intrinsic-block-size
contain-intrinsic-height
contain-intrinsic-inline-size
contain-intrinsic-size
contain-intrinsic-width
container
container-name
container-type
cos()
ellipse()
exp()
font-palette
hyphenate-character
hyphens
hypot()
inset()
log()
max()
min()
minmax()
mod()
polygon()
pow()
prefers-color-scheme
rem()
round()
ruby-align
ruby-position
scroll-behavior
sin()
sqrt()
tan()
text-wrap
text-wrap-mode
text-wrap-style
white-space-collapse
クラスセレクタ
タイプセレクタ
ユニバーサルセレクタ
入れ子セレクタ
子セレクタ
子孫セレクタ
属性セレクタ
間接セレクタ
隣接セレクタ
Chrome: ::after
::backdrop
::before
::cue
::file-selector-button
::first-letter
::first-line
::marker
::part()
::placeholder
::selection
::slotted()
:active
:any-link
:checked
:default
:defined
:disabled
:empty
:enabled
:first
:first-child
:first-of-type
:focus
:focus-visible
:focus-within
:fullscreen
:has()
:host
:hover
:in-range
:indeterminate
:invalid
:lang()
:last-child
:last-of-type
:left
:link
:not()
:nth-child()
:nth-last-child()
:nth-last-of-type()
:nth-of-type()
:only-child
:only-of-type
:optional
:out-of-range
:placeholder-shown
:read-only
:read-write
:required
:right
:root
:scope
:state()
:target
:valid
:visited
@charset
@color-profile
@container
@counter-style
@font-feature-values
@font-palette-values
@keyframes
@layer
@property
@scope
@start-style
@supports
ID セレクタ
accent-color
acos()
appearance
asin()
atan()
atan2()
attr()
background
background-color
calc()
circle()
clamp()
color()
color-mix()
contain
contain-intrinsic-block-size
contain-intrinsic-height
contain-intrinsic-inline-size
contain-intrinsic-size
contain-intrinsic-width
container
container-name
container-type
cos()
ellipse()
exp()
field-sizing
font-palette
hyphenate-character
hyphens
hypot()
inset()
log()
max()
min()
minmax()
mod()
polygon()
pow()
prefers-color-scheme
rem()
round()
ruby-align
ruby-position
scroll-behavior
sin()
sqrt()
tan()
text-spacing-trim
text-wrap
white-space-collapse
クラスセレクタ
タイプセレクタ
ユニバーサルセレクタ
入れ子セレクタ
子セレクタ
子孫セレクタ
属性セレクタ
間接セレクタ
隣接セレクタ
Safari: ::after
::before
::cue
::file-selector-button
::first-letter
::first-line
::marker
::part()
::placeholder
::selection
::slotted()
:active
:any-link
:checked
:default
:defined
:disabled
:empty
:enabled
:first
:first-child
:first-of-type
:focus
:focus-visible
:focus-within
:has()
:host
:hover
:in-range
:indeterminate
:invalid
:lang()
:last-child
:last-of-type
:left
:link
:not()
:nth-child()
:nth-last-child()
:nth-last-of-type()
:nth-of-type()
:only-child
:only-of-type
:optional
:out-of-range
:placeholder-shown
:read-only
:read-write
:required
:right
:root
:scope
:state()
:target
:valid
:visited
@charset
@color-profile
@container
@counter-style
@font-feature-values
@font-palette-values
@keyframes
@layer
@property
@scope
@start-style
@supports
ID セレクタ
accent-color
acos()
appearance
asin()
atan()
atan2()
attr()
background
background-color
calc()
circle()
color()
color-mix()
contain
contain-intrinsic-block-size
contain-intrinsic-height
contain-intrinsic-inline-size
contain-intrinsic-size
contain-intrinsic-width
container
container-name
container-type
cos()
ellipse()
exp()
font-palette
hyphenate-character
hyphens
hypot()
inset()
log()
max()
min()
minmax()
mod()
polygon()
pow()
prefers-color-scheme
rem()
round()
ruby-position
scroll-behavior
sin()
sqrt()
tan()
text-wrap
text-wrap-mode
text-wrap-style
white-space-collapse
クラスセレクタ
タイプセレクタ
ユニバーサルセレクタ
入れ子セレクタ
子セレクタ
子孫セレクタ
属性セレクタ
間接セレクタ
隣接セレクタ
iOS Safari: ::after
::before
::cue
::file-selector-button
::first-letter
::first-line
::marker
::part()
::placeholder
::selection
::slotted()
:active
:any-link
:checked
:default
:defined
:disabled
:empty
:enabled
:first
:first-child
:first-of-type
:focus
:focus-visible
:focus-within
:fullscreen
:has()
:host
:hover
:in-range
:indeterminate
:invalid
:lang()
:last-child
:last-of-type
:left
:link
:not()
:nth-child()
:nth-last-child()
:nth-last-of-type()
:nth-of-type()
:only-child
:only-of-type
:optional
:out-of-range
:placeholder-shown
:read-only
:read-write
:required
:right
:root
:scope
:state()
:target
:valid
:visited
@charset
@color-profile
@container
@counter-style
@font-feature-values
@font-palette-values
@keyframes
@layer
@property
@scope
@start-style
@supports
ID セレクタ
accent-color
acos()
appearance
asin()
atan()
atan2()
attr()
background
background-color
calc()
circle()
color()
color-mix()
contain
contain-intrinsic-block-size
contain-intrinsic-height
contain-intrinsic-inline-size
contain-intrinsic-size
contain-intrinsic-width
container
container-name
container-type
cos()
ellipse()
exp()
font-palette
hyphenate-character
hyphens
hypot()
inset()
log()
max()
min()
minmax()
mod()
polygon()
pow()
prefers-color-scheme
rem()
round()
ruby-position
scroll-behavior
sin()
sqrt()
tan()
text-wrap
text-wrap-mode
text-wrap-style
white-space-collapse
クラスセレクタ
タイプセレクタ
ユニバーサルセレクタ
入れ子セレクタ
子セレクタ
子孫セレクタ
属性セレクタ
間接セレクタ
隣接セレクタ
Android Chrome: ::after
::backdrop
::before
::cue
::file-selector-button
::first-letter
::first-line
::marker
::part()
::placeholder
::selection
::slotted()
:active
:any-link
:checked
:default
:defined
:disabled
:empty
:enabled
:first
:first-child
:first-of-type
:focus
:focus-visible
:focus-within
:fullscreen
:has()
:host
:hover
:in-range
:indeterminate
:invalid
:lang()
:last-child
:last-of-type
:left
:link
:not()
:nth-child()
:nth-last-child()
:nth-last-of-type()
:nth-of-type()
:only-child
:only-of-type
:optional
:out-of-range
:placeholder-shown
:read-only
:read-write
:required
:right
:root
:scope
:state()
:target
:visited
@charset
@color-profile
@container
@counter-style
@font-feature-values
@font-palette-values
@keyframes
@layer
@property
@scope
@start-style
@supports
ID セレクタ
accent-color
acos()
appearance
asin()
atan()
atan2()
attr()
background
background-color
calc()
circle()
clamp()
color()
color-mix()
contain
contain-intrinsic-block-size
contain-intrinsic-height
contain-intrinsic-inline-size
contain-intrinsic-size
contain-intrinsic-width
container
container-name
container-type
cos()
ellipse()
exp()
field-sizing
font-palette
hyphenate-character
hyphens
hypot()
inset()
log()
max()
min()
minmax()
mod()
polygon()
pow()
prefers-color-scheme
rem()
round()
ruby-align
ruby-position
scroll-behavior
sin()
sqrt()
tan()
text-spacing-trim
text-wrap
white-space-collapse
クラスセレクタ
タイプセレクタ
ユニバーサルセレクタ
入れ子セレクタ
子セレクタ
子孫セレクタ
属性セレクタ
間接セレクタ
隣接セレクタ