The animation-direction property has two more values. They are used when the animation playback count animation-iteration-count is greater than one. And they both define the alternating animation duration.
If the alternate value is used, odd runs will be direct and even ones will be reversed.
.element {
animation-name: move;
animation-duration: 1s;
animation-iteration-count: 2;
animation-direction: alternate;
}
In our example, the animation move will be played twice: first forwards (odd run), then in reverse (even run).
If the alternate-reverse value is used, odd runs will be reversed and even ones will be played forwards.
Let’s see how it works in an example.
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Hello, animation!</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/keyframes-storyboard">2. @keyframes: storyboard</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/keyframes-from-to">3. @keyframes: from and to</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/keyframes-frame-grouping">4. @keyframes: frame grouping</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/complex-animation-1">5. Complex animation, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/complex-animation-2">6. Complex animation, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/water-adventure">7. Water adventure</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-iteration-count">8. Animation play count: animation-iteration-count</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-direction-1">9. Animation direction: animation-direction, step 1</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/dynamic/animations/animation-direction-2">10. Animation direction: animation-direction, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-delay-1">11. Animation delay: animation-delay, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-delay-2">12. Animation delay: animation-delay, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-delay-3">13. Animation delay: animation-delay, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/air-journey">14. Air journey</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-fill-mode-1">15. Pre- and post-animation state: animation-fill-mode, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-fill-mode-2">16. Pre- and post-animation state: animation-fill-mode, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-fill-mode-3">17. Pre- and post-animation state: animation-fill-mode, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-fill-mode-4">18. Pre- and post-animation state: animation-fill-mode, step 4</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-fill-mode-5">19. Pre- and post-animation state: animation-fill-mode, step 5</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/launching-factory-1">20. Launching a factory, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/launching-factory-2">21. Launching a factory, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-play-state">22. Stopping and starting an animation: animation-play-state</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-timing-function-1">23. Animation form, animation-timing-function</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-timing-function-2">24. Animation-timing-function, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-timing-function-3">25. Animation-timing-function, step 3</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/animation-timing-function-4">26. Animation-timing-function, step 4</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/rocket-launch-pad-1">27. Rocket to the launch pad, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/rocket-launch-pad-2">28. Rocket to the launch pad, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/landing-1">29. Landing, step 1</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/landing-2">30. Landing, step 2</a></li><li class="main-nav__course-contents-item"><a href="/courses/dynamic/animations/landing-3">31. 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2.334.725-.13.837-1.46.93-2.13h.112c.937.492 1.647 1.33 1.98 2.334-.388.176-.793.31-1.21.4zm18.365-2.864c-1.104-.145-2.215-.232-3.33-.26-.546-.01-1.093.05-1.626.176-1.166.483-2.08 1.425-2.53 2.604l-.158.79 1.795.623c.558.153 1.132.24 1.71.26h.28c3.245-.177 4.137-3.72 4.137-3.72l.084-.353zm-1.264 1.86c-.54 1.394-2.882 1.646-2.966 1.646-.517-.02-1.03-.11-1.525-.26-.186-.085-.633-.26-1.08-.43.374-.966 1.117-1.746 2.065-2.165 0 .68.158 1.953.81 2.083.65.13.613-1.535.566-2.26.934.005 1.865.064 2.79.177-.11.316-.473.65-.66 1.17z" fill="#151841"/><path d="M19.26 39.27c.535 1.362 1.56 2.473 2.874 3.115.534.312 1.204-.07 1.207-.69.002-.285-.15-.55-.397-.695-.918-.46-1.65-1.222-2.073-2.158-.344-.957-1.972-.52-1.61.428zm29.45 3.125c1.083-.59 2.01-1.428 2.706-2.446.3-.556-.112-1.228-.743-1.21-.293.007-.56.17-.698.428-.568.776-1.306 1.412-2.158 1.86-.394.23-.517.742-.27 1.125.263.376.773.482 1.163.242z" fill="#EFA75B" stroke-width="13"/><path d="M16.025 32.436c1.525-1.386 2.427-4.408 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3.896.106.328.5.46.78.26.273.192.653.06.745-.26.735-2.66-1.6-5.728-3.766-7.16z" fill="#F1662A"/></svg></span><p class="course-loading-overlay__message"><b class="course-loading-overlay__message-title">Loading…</b><br><span class="course-loading-overlay__message-text">Everything will be ready in few seconds</span></p></div></div><div class="course-layout__sidebar course-theory"><div class="course-theory__inner course-theory__inner--left-stub"><button class="course-theory__close icon-close icon-close--light" type="button">Close</button><ul class="course-tabs course-tabs--non-interactive course-layout__theory-heading js--theory-tabs"><li class="course-tabs__item course-tabs__item--external course-tab course-tab--centered"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered course-tab--active js--theory-tab__theory"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered js--theory-tab__comments"><span class="course-tab__icon"><svg aria-hidden="true" style="width: 16px; height: 16px; fill: #2e2c9c;"><use xlink:href="/img/sprites/up.svg#comment"></use></svg></span><span class="course-tab__title">Comments</span></li></ul><section class="course-theory__content"><div class="js--theory-pane__theory course-theory__content-inner"><h1 class="course-theory__content-heading">Animation direction: animation-direction, step 2</h1><div class="course-theory__content-text"><p>The <code>animation-direction</code> property has two more values. They are used when the animation playback count <code>animation-iteration-count</code> is greater than one. And they both define the alternating animation duration.</p><p>If the <code>alternate</code> value is used, odd runs will be direct and even ones will be reversed.</p><pre><code>.element {
animation-name: move;
animation-duration: 1s;
animation-iteration-count: 2;
animation-direction: alternate;
}</code></pre><p>In our example, the animation <code>move</code> will be played twice: first forwards (odd run), then in reverse (even run).</p><p>If the <code>alternate-reverse</code> value is used, odd runs will be reversed and even ones will be played forwards.</p><p>Let’s see how it works in an example.</p></div></div><div class="js--theory-pane__comments hidden course-theory__content-inner"><div class="course-theory__content-text"><h2 class="course-theory__content-heading">Comments</h2><div id="disqus_thread"></div><script>
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<html lang="en">
<head>
<title>Animation direction: animation-direction, step 2</title>
<meta charset="utf-8">
<link rel="stylesheet" href="epoch2.css">
<link rel="stylesheet" href="style.css">
</head>
<body class="mechanical">
<div class="mechanism">
<span class="gear-big"></span>
<span class="gear-small"></span>
</div>
</body>
</html>
</div></div><div class="js--editor course-editor course-layout__editor course-editor--hidden" id="" data-tab="css" data-split=""><span class="course-editor__label"><span class="course-editor__label-item">CSS</span><button class="course-editor__label-item course-editor__label-item--interactive hidden js--editor__unsplit-button course-editor__label-item--simple" title="No split" type="button"><svg width="7" height="10" viewBox="0 0 7 10" xmlns="http://www.w3.org/2000/svg"><g stroke="currentColor" fill="none" fill-rule="evenodd"><path stroke-linecap="round" d="M.6 3.503L3.443.518l2.842 2.985"></path><path d="M3.5 1.5v7.16" stroke-linecap="square"></path></g></svg></button></span><div class="course-editor__item" id="css-editor">@keyframes clockwise {
to {
transform: rotate(180deg);
}
}
@keyframes anticlockwise {
to {
transform: rotate(-180deg);
}
}
.gear-big {
animation-name: clockwise;
animation-duration: 2s;
}
.gear-small {
animation-name: anticlockwise;
animation-duration: 2s;
}
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</p></div></div><div class="course-browser__menu course-browser__menu--vertical"><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--increase" type="button" disabled title="Larger"><span class="course-browser__menu-item-inner">Larger</span></button><span class="course-browser__menu-item course-browser__zoom"><span class="course-browser__menu-item-inner">100%</span></span><button class="course-browser__menu-item course-browser__menu-button course-browser__menu-button--decrease" type="button" title="Smaller"><span class="course-browser__menu-item-inner">Smaller</span></button></div><div class="js--validation-view course-browser__results-restriction course-browser__results-restriction--mini"><span class="tooltip tooltip--light tooltip--short course-browser__results-restriction-tooltip"><span class="js--tooltip-text"></span><button class="js--validation-view-close course-browser__results-restriction-tooltip-close icon-close" type="button">Закрыть</button></span></div></div><div class="course-goals js--goals"><div class="course-goals__heading"><span class="course-goals__heading-title"><span class="course-goals__count-label">Goals</span><span class="course-goals__count">completed</span></span><div class="js--annotations course-task-stats course-task-stats--disabled course-task-stats--centered "><span class="course-task-stats__indicator"><svg width="12" height="12" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M15 8C15 11.866 11.866 15 8 15C4.13403 15 1 11.866 1 8C1 4.13403 4.13403 1 8 1C11.866 1 15 4.13403 15 8ZM16 8C16 12.4183 12.4183 16 8 16C3.58173 16 0 12.4183 0 8C0 3.58173 3.58173 0 8 0C12.4183 0 16 3.58173 16 8ZM6.7287 3.88849C6.6958 3.59229 6.92761 3.33325 7.22565 3.33325H8.77502C9.07306 3.33325 9.30487 3.59229 9.27197 3.88849L8.71643 8.88849C8.68829 9.14166 8.47424 9.33325 8.21948 9.33325H7.78119C7.52643 9.33325 7.31238 9.14166 7.28424 8.88849L6.7287 3.88849ZM9.33368 12.0001C9.33368 12.7365 8.73669 13.3334 8.00031 13.3334C7.26392 13.3334 6.66699 12.7365 6.66699 12.0001C6.66699 11.2637 7.26392 10.6667 8.00031 10.6667C8.73669 10.6667 9.33368 11.2637 9.33368 12.0001Z" fill="currentColor"></path></svg><span class="js--annotations-counter course-task-stats__counter">0</span></span><div class="course-task-stats__scroller-wrapper"><div class="course-task-stats__scroller"><ul class="js--annotations-list course-task-stats__list"></ul></div></div></div><button class="course-goals__button course-goals__button--expand js--goals__expand" type="button"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-collapse"></use></svg></button><a class="course-goals__button course-goals__button--next button button--green button--without-border hidden" href="/courses/dynamic/animations/animation-delay-1" title="Animation delay: animation-delay, step 1"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#arrow-white--mini"></use></svg></a></div><div class="course-goals__content"><ol class="course-goals__list"><li class="course-goals__list-item">Set the playback count for both cogwheels to <code>2</code><span class="mark">,</span></li><li class="course-goals__list-item">then set the alternating direction of playback,</li><li class="course-goals__list-item">then change the direction to reverse alternating.</li></ol></div></div></div></div></article></div><div class="course-interface__overlay course-interface__overlay--active"></div></main><script
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