From 074785cea106179cb3305637055ab0a009ca74f2 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:42:52 -0500 Subject: initial commit --- files/pt-br/web/css/@keyframes/index.html | 222 ++++++++++++++++++++++++++++++ 1 file changed, 222 insertions(+) create mode 100644 files/pt-br/web/css/@keyframes/index.html (limited to 'files/pt-br/web/css/@keyframes') diff --git a/files/pt-br/web/css/@keyframes/index.html b/files/pt-br/web/css/@keyframes/index.html new file mode 100644 index 0000000000..c11df0eee6 --- /dev/null +++ b/files/pt-br/web/css/@keyframes/index.html @@ -0,0 +1,222 @@ +--- +title: '@keyframes' +slug: Web/CSS/@keyframes +translation_of: Web/CSS/@keyframes +--- +

{{CSSRef}}

+ +

The @keyframes CSS at-rule controls the intermediate steps in a CSS animation sequence by defining styles for keyframes (or waypoints) along the animation sequence. This gives more control over the intermediate steps of the animation sequence than transitions.

+ +
@keyframes slidein {
+  from {
+    margin-left: 100%;
+    width: 300%;
+  }
+
+  to {
+    margin-left: 0%;
+    width: 100%;
+  }
+}
+ +

JavaScript can access the @keyframes at-rule with the CSS object model interface {{domxref("CSSKeyframesRule")}}.

+ +

To use keyframes, create a @keyframes rule with a name that is then used by the {{ cssxref("animation-name") }} property to match an animation to its keyframe declaration. Each @keyframes rule contains a style list of keyframe selectors, which specify percentages along the animation when the keyframe occurs, and a block containing the styles for that keyframe.

+ +

You can list the keyframe percentages in any order; they will be handled in the order they should occur.

+ +

Valid keyframe lists

+ +

If a keyframe rule doesn't specify the start or end states of the animation (that is, 0%/from and 100%/to, browsers will use the element's existing styles for the start/end states. This can be used to animate an element from its initial state and back.

+ +

Properties that can't be animated in keyframe rules are ignored, but supported properties will still be animated.

+ +

Resolving duplicates

+ +

If multiple keyframe sets exist for a given name, the last one encountered by the parser is used. @keyframes rules don't cascade, so animations never derive keyframes from more than one rule set.

+ +

If a given animation time offset is duplicated, the last keyframe in the @keyframes rule for that percentage is used for that frame. There's no cascading within a @keyframes rule if multiple keyframes specify the same percentage values.

+ +

When properties are left out of some keyframes

+ +

Properties that aren't specified in every keyframe are interpolated if possible — properties that can't be interpolated are dropped from the animation. For example:

+ +
@keyframes identifier {
+  0% { top: 0; left: 0; }
+  30% { top: 50px; }
+  68%, 72% { left: 50px; }
+  100% { top: 100px; left: 100%; }
+}
+
+ +

Here, the {{ cssxref("top") }} property animates using the 0%, 30%, and 100% keyframes, and {{ cssxref("left") }} animates using the 0%, 68%, and 100% keyframes.

+ +

When a keyframe is defined multiple times

+ +

If a keyframe is defined multiple times but not all affected properties are in each keyframe, only the values specified in the latest keyframe are considered. For example:

+ +
@keyframes identifier {
+  0% { top: 0; }
+  50% { top: 30px; left: 20px; }
+  50% { top: 10px; }
+  100% { top: 0; }
+}
+
+ +

In this example, at the 50% keyframe, the value used is top: 10px and all other values at this keyframe are ignored.

+ +

{{ non-standard_inline }} {{ fx_minversion_inline("14") }} Cascading keyframes are supported starting in Firefox 14. For the example above, it means that at the 50% keyframe, the value left: 20px will be considered. This is not defined in the specification yet, but it is being discussed.

+ +

!important in a keyframe

+ +

Declarations in a keyframe qualified with !important are ignored.

+ +
@keyframes important1 {
+  from { margin-top: 50px; }
+  50%  { margin-top: 150px !important; } /* ignored */
+  to   { margin-top: 100px; }
+}
+
+@keyframes important2 {
+  from { margin-top: 50px;
+         margin-bottom: 100px; }
+  to   { margin-top: 150px !important; /* ignored */
+         margin-bottom: 50px; }
+}
+
+ +

Syntax

+ +

Values

+ +
+
{{cssxref("custom-ident")}}
+
A name identifying the keyframe list. This must match the identifier production in CSS syntax.
+
from
+
A starting offset of 0%.
+
to
+
An ending offset of 100%.
+
{{cssxref("<percentage>")}}
+
A percentage of the time through the animation sequence at which the specified keyframe should occur.
+
+ +

Formal syntax

+ +
{{csssyntax}}
+ +

Examples

+ +

See Using CSS animations for examples.

+ +

Specifications

+ + + + + + + + + + + + + + + + +
SpecificationStatusComment
{{ SpecName('CSS3 Animations', '#keyframes', '@keyframes') }}{{ Spec2('CSS3 Animations') }} 
+ +

Browser compatibility

+ +

{{ CompatibilityTable() }}

+ +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
FeatureChromeEdgeFirefox (Gecko)Internet ExplorerOperaSafari (WebKit)
Basic support +

{{ CompatVersionUnknown() }}{{ property_prefix("-webkit") }}
+ 43.0

+ 		{{CompatVersionUnknown}}{{ CompatGeckoDesktop("5.0") }}{{ property_prefix("-moz") }}
+ {{ CompatGeckoDesktop("16.0") }}		1012 {{ property_prefix("-o") }}
+ 12.10 #		 +

4.0{{ property_prefix("-webkit") }}
+ 9.0 #

+
ignore !important declarations{{CompatUnknown}}{{CompatUnknown}}{{CompatGeckoDesktop(19)}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
FeatureAndroidEdgeFirefox Mobile (Gecko)IE PhoneOpera MobileSafari Mobile
Basic support{{ CompatVersionUnknown() }}{{ property_prefix("-webkit") }}{{CompatVersionUnknown}}{{ CompatGeckoMobile("5.0") }}{{ property_prefix("-moz") }}
+ {{ CompatGeckoMobile("16.0") }}		{{ CompatUnknown() }}{{ CompatUnknown() }}{{ CompatUnknown() }}
ignore !important declarations{{CompatUnknown}}{{CompatUnknown}}{{CompatGeckoMobile(19)}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
+
+ +

Notes

+ +
    +
  1. @keyframes unsupported in scoped stylesheets in Firefox ({{bug(830056)}}).
    2. +
+ +

See also

+ + -- cgit v1.2.3-54-g00ecf