View source for CSS animations tutorial

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{{Web technology tutorial|Beginners}}
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<div class="tut_goals">
; Learning goals
* Be able to create simple CSS transforms

; Prerequisites
* [[CSS tutorial]]

; Level and target population
* Beginners

; Teaching materials
* Example text: ....

; Remarks
* This tutorial is intended for students in educational technology or any other field that is technology intensive. For people who need less, there exist many easy [[CSS links#General_Tutorials|CSS tutorials]] on the web. This text is intended for students who also must learn principles and who are willing to learn CSS by doing a project, looking at CSS code and online reference manuals.
* Ideally, a teacher also should assign a text formatting task, during or before assigning this tutorial for reading).
</div>

== Introduction ==

The CSS animations specification {{quotation|describes a way for authors to animate the values of CSS properties over time, using keyframes. The behavior of these keyframe animations can be controlled by specifying their duration, number of repeats, and repeating behavior.}} ([https://www.w3.org/TR/css-animations-1/ CSS Animations Level 1], W3C Working Draft, 30 November 2017).

<source lang="CSS">
div {
    -webkit-animation: mykeyframes 5s; /* Chrome, Safari, Opera */
    animation: mykeyframes 5s;
}

/* Chrome, Safari, Opera */
@-webkit-keyframes mykeyframes {
    from {background: red;}
    to {background: yellow;}
}

/* Standard syntax */
@keyframes mykeyframes {
    from {background: blue;}
    to {background: red;}
} 
</source>

== Examples ==

=== Simple color animation ===

Source: The CSS suite from the CSS consortium. The code below and in CodePen has been slightly altered.

http://test.csswg.org/suites/css-animations-1_dev/nightly-unstable/html/animation-keyframes-001.htm

Codepen (for play and copy/paste): https://codepen.io/danielkschneider/pen/KoBWpV

<source lang="CSS">
  div.coloranim {
    animation-name: sample;
    animation-duration: 10s;
    background-color: blue;
    height: 100px;
    width: 100px;
  }

  @keyframes sample {
    from {     background-color: blue;    }
    30% {      background-color: green;    }
    65% {      background-color: yellow;    }
    to {       background-color: blue;    }
  }
</source>
<source lang="HTML5">
  <p>
   There is a filled blue square with 'Filler Text' when the page loads.
   Color of the square gradully changes in order: BLUE to GREEN to YELLOW and back to BLUE in 10 seconds.

  Try to add another keyframe for another color. Make the animation slower, then faster.
  </p>
  <div id="coloranim">I argue for a change<br>Now</div>
</source>

=== Simple moving animation ===

== Links ==

; Official
* [https://www.w3.org/TR/css-animations-1/ CSS Animations Level 1] W3C Working Draft, 30 November 2017 (as of April 2018)
* [http://test.csswg.org/suites/css-animations-1_dev/nightly-unstable/html/toc.htm HTML5 test suite]

; Other

* [https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_animations Using CSS animations] (MDN)

* http://lea.verou.me/tag/css3-animations/
** http://leaverou.github.io/animatable/

* http://cssanimate.com

[[Category: CSS]]