آموزش ویژگی animation-timing-function در CSS. That might not be the clearest explanation, but the syntax might help clarify. It allows us to control the animation to move gradually. linear The animation begins and progresses at a constant rate over the specified duration; this value is equivalent to cubic-bezier(0,0,1,1)In This Article. Is that wrong? I have tried many of the marquee libraries that are out there. See the Pen CSS Animation Example 3 by Kelby Gassman on CodePen. <easing-function> The easing function that corresponds to a given animation, as determined by animation-name. Creating the leaves. ----- COURSE LINKS:+ Repo - Brackets editor - Functions. Both the values steps(4,start) and steps(4,end) specify that there are 4 steps. As you might already know, the linear timing function can be easily set in CSS by using the linear keyword. The animation has a slow start, then fast, before it ends slowly: ease-in: The animation has a slow start: ease-out: The animation has a slow end: ease-in-out: The animation has both a slow start and a slow end: cubic-bezier(n, n, n, n) Define your own values in the cubic. Description. This can be specified in seconds or milliseconds. These timing functions are valid : /* There is 5 treads, the last one happens right before the end of the animation. The animation-timeline CSS property specifies the timeline that is used to control the progress of a CSS animation. If no animation-timing-function is specified on a keyframe, the corresponding value of animation-timing-function from the element to which the animation is applied is used for that keyframe. X軸移動. step-start: Equivalent to steps(1, start) step-end: Equivalent to steps(1, end) steps(int,start|end) Specifies a stepping function, with two parameters. The animation-timing-function property is one of the CSS3 properties. It describes how an animation will progress over one cycle of its duration, allowing it to change speed during its course. We update the value of each variable on hover (or toggle, or whatever). The steps is one of the timing ( easing) functions available ( and you cannot use multiple easing functions ). Unlike CSS animations you can either apply this to the whole animation or between individual keyframes. animation-timing-function. linear. 相反，关键帧的时间函数会在逐个属性的基础上应用，从指定该函数的关键帧开始，直到下一个指定该属性的关键帧，或者直到动画结束（如果没有后续. The animation-timing-function property is one of the CSS3 properties. And you can do this as many times as you want. css property: animation-timing-function. If no animation-timing-function is specified on a keyframe, the corresponding value of animation-timing-function from the element to which the animation is applied is used for that keyframe. In other words, each time the animation cycles, the animation will reset to the end state and start over again. ease. Staircase functions (steps). If no animation-timing-function is specified on a keyframe, the corresponding value of animation-timing-function from the element to which the animation is applied is used for that keyframe. The transition-timing-function property, normally used as part of transition shorthand, is used to define a function that describes how a transition will proceed over its duration, allowing a transition to change speed during its course. animation-timing-function: step-end; The animation stays at the initial state until the end, when it instantly jumps to the final state. This way you can define each frame of you animation. jump-end. JSFiddle here : CLICK. Step 2: What is a sprite? The first that you should know is what kind of image you’re actually working with. */ steps(2) These timing function are invalid :CSS transition-timing-function Property. That means we use getBoundingClientRect () on the element that will serve as a proxy for the start state, and divide it with the value from the end state. An image sprite is a collection of images put into a single image. In practice,. –La propriété animation-timing-function définit comment la vitesse de l'animation va changer pendant chaque cycle, et pas pandent l'animation entière. Put all your images in one sprite by creating a line of frames that preserves the images’ order, i. 5s makes the animation last 1. The blinking effect will be created by applying animation to our border. A timing function (animation-timing-function in CSS) lets you change the animation speed curve. The animation CSS property is a shorthand property for the various animation properties: animation-name, animation-duration, animation-timing-function, animation-delay, animation-iteration-count, animation-direction, animation-fill-mode, and animation-play-state. Staircase functions (steps). The x coordinates of P1 and P2 are restricted to the range [0, 1]. thanks for the answer! understand what you're saying about fill-mode and direction, but see an issue with steps. ease-in-out. Within a keyframe, animation-timing. <time> The time that an animation takes to complete one cycle. If no animation-timing-function is specified on a keyframe, the corresponding value of animation-timing-function from the element to which the animation is applied is used for that keyframe. I've tried. Within a keyframe, animation-timing-function is an at-rule. Hello World. In animation, we defined the animation in the shorthand method, in only one line, but we could also write it using 4 lines, in the long form:. The step timing functions divide the input time into a specified number of intervals that are equal in length, with a number of steps and a step position. Using this timing function, the animation jumps immediately to the end state and stay in that position until the end of the animation. animation-delay: value; Xem DemoInstead of repeating the animation infinite times, you can specify a number of repetitions like this: animation: spin 3s 3 ease-in-out; /* 3secs, repeat 3 times */. This acceleration curve is defined using one <easing-function> for each property. 1. The linear easing function: linear The linear easing function is an identity function meaning that its output progress value is equal to the input progress value for all inputs. The default value of the transition-timing function is ‘ease’. The animation-timing-function is used to determine the timing function applied to each keyframe as defined in § 3 Assembling Keyframes. The animation-timing-function CSS property specifies the speed curve of an animation. js file. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself. The typewriter effect relies on the CSS step() timing function and animation-fill-mode: forwards. The first big change to web animation easings (aka timing functions) is upon us. The W3Schools online code editor allows you to edit code and view the result in your browserStep 1: Calculate the start and end states. , the first image will be the leftmost and the last image will be the rightmost. In other words, t is the same as animation progress. */ steps(5, end) /* A two-step staircase, the first one happening at the start of the animation. First of all, define some basic CSS styles for the “ . The final transition property is CSS transition-delay. In some cases, this is desirable; however, in the real world, motion usually doesn’t work like that. The steps() timing function is unique to CSS and can be used to create some interesting effects. Animation Timing Functions: Controlling Animation Pace. 1. Within a keyframe, animation-timing-function is an at-rule-specific. 30 is the number of steps the animation takes, and these steps are spread evenly until the end of the animation. This is important because it creates the “typed” effect. viii. hubspot. I'm using keyframes and an animation-timing-function of steps (3). Add the delay after the easing (AKA timing-function) value. inOut(Easing. Easing functions may be specified on individual keyframes in a @keyframes rule. The steps Timing Function. Animation-timing-function: This animation attribute specifies how an animation transitions through keyframes by establishing acceleration curves. animation-direction: sets the direction of the animation after the cycle. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. <timing-function> Chaque valeur <easing-function> représente une fonction temporelle à rattacher à une animation définie grâce à animation-name. The animation-composition property specifies the operation to perform to produce the final effect value after compositing the. This is used to make one set of CSS styles change into another set smoothly or jerkily (using steps). どのプロパティにアニメーションを適用するか指定する (all/none/プロパティ名) transition-duration. It must be a positive integer (greater than 0). You use it like this: transition-delay: 1 s ; Code language: CSS (css) To combine it with every else in transition, you just add the delay to the end: <easing-function> The easing function that corresponds to a given animation, as determined by animation-name. transition-timing-function CSS property sets how intermediate values are calculated for CSS properties being affected by a transition effect. Elle a les valeurs suivantes: ease - (par défaut) l'animation commence lentement, puis devient plus rapide et se termine lentement. 1. This, in essence, lets you establish an acceleration curve so that the speed of the transition can vary over its duration. The non-step keyword values (ease, linear, ease-in-out, etc. The state of the element will not vary gradually, but rather jump from state to state in separate instants. Here's more detail on how they work. extend. The syntax for the linear easing function is simply the linear keyword. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. My goal is to recreate an animated effect given from our design team on Android and I've come pretty close. div { width: 200px; height: 200px; background: red; animation: animScale 2000ms ease-in-out 1000ms infinite, animOpacity 2000ms ease-in-out 2000ms infinite; /* scale will start after 1s and opacity after 2s (1s after the scale)*/ } there is no order to follow, it can be any. Like other CSS animations, we can use any supported timing function here, but we need to apply the same function for all animations (move1, move2, and move3) at the same time. The values for animation-timing-function are ease, linear, ease-out, step-start and many more, as outlined in the spec. The following types of timelines can be set via. If you do iteration at 1, at the end of the last frame it will revert back. Responsive. CSS animation-timing-function属性定义CSS动画在每一动画周期中执行的节奏。可能值为一或多个timing function(数学函数)对于关键帧动画来说，timing function作用于一个关键帧周期而非整个动画周期，即从关键帧开始开始，到关键帧结束结束。This seems to be sort of a "grey" area (pun intended) with respect to the steps() timing function for animations. animation-timing-function: step-end; The animation stays at the initial state until the end, when it instantly jumps to the final state. Try it It is often convenient to use the shorthand property animation to set all animation properties at once. For example, using CSS animation: animation: moveRight 5s 1s steps(5, start); During the delay phase, the input progress value will be. The animation-timing-function sets the animation speed curve. The last timing function we will look at is something that affects the rate at which our properties change but isn't technically a timing function. The step timing functions divides the input time into a specified number of intervals that are equal in length. Rocket to the launch pad, step 1. CSS animations offers a lot of different parameters you can tweak: animation-name — the name of the animation which references an animation created using keyframes. The keyword values ease, linear, ease-in, ease-out, and ease-in-out are serialized as-is, that is, they are not converted to the equivalent cubic. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. 0, 1. Description. For example, you can use the transition-duration class to specify the length of the transition, or the transition-timing-function class to specify an easing function that controls the acceleration of the transition. The animation's timeline is the document's default DocumentTimeline. Source. For example, although mathematically we might expect that a step timing function with a step position of jump-start would step up (i. Read more about animation-timing-function and steps function at Mozilla Developer. The animation-timing-function sets the animation speed curve. Result: CSS Code: #myDIV { animation-timing-function: ease-in-out; } Click the property values above to see the result. –La propriété animation-timing-function définit comment la vitesse de l'animation va changer pendant chaque cycle, et pas pandent l'animation entière. The first parameter specifies the number of intervals in the function. You are still missing two things. The animation property is divided into @keyframes, like the FPS (frames per second) of a camera. If an animation has the same starting and ending properties, it’s useful to comma-separate the 0% and 100% values inside @keyframes: @keyframes pulse { 0%, 100% { background-color: yellow; } 50% { background-color:. The steps () functional notation defines a step function dividing the domain of output values in equidistant steps. Timing functions may be specified on individual keyframes in a @keyframes rule. 0) curve which results in a constant speed of the animation throughout its entire cycle. 4-CSS Animation. */ steps(5, end) /* A two-step staircase, the first one happening at the start of the animation. . The animation shorthand CSS property applies an animation between styles. To learn more, see the Color Schemes documentation. There are different techniques provided by this library to animate your component’s properties, the most basic being `Animated. The only change between this and the first example is that we've used different transition timing functions. CSS: -webkit-animation-timing-function: steps (1, end); -moz-animation-timing-function: steps (1, end); -ms-animation-timing-function: steps (1, end); -o-animation-timing-function: steps (1, end); animation-timing-function: steps (1, end); Sample code: Controlling easing in CSS animations. my-element { animation-timing-function: steps(10, end); } The first argument is how many steps. my-element { animation-timing-function: steps(10, end); } The first argument. Manipulating the animation pace. A timing function in CSS is usually referred to easing functions . The ease-in-out timing function creates a smooth and balanced animation, with both a gradual start and a gentle finish. animation-delay: the time between the element being loaded and the start of the animation sequence (cool examples). Note: animation-range-start is included. 3. Use animation-timing-function: linear; to get even animation speed. Technically, the implementation would involve transform, transform-origin, animation-timing-function and several more calculations. The default value is 0, which means that no animation will occur. Unlike CSS animation, we can make any timing function and any drawing function here. In our example animation above, we apply timing to the brown bag on the right as the bags. Overall, animations and transitions can be a useful way to add visual interest and interactivity to your web page. 1. */ steps(2, start) /* The second parameter is optional. CSSでアニメーションするには、keyframesとanimationプロパティの2つを組み合わせます。 keyframesでどのような時刻にどのような状態かを指定し、animationプロパティで時刻の変化の仕方を指定します。. The timing function that corresponds to a property to animate, as determined by animation-property. You may specify multiple easing functions; each one will be applied to the corresponding property as specified by. That is, you can specify a timing function using the easing property. If you are planning on using custom cubic-bezier function, we would recommend using cubic-bezier. steps Timing FunctionIf you want to skip gradual transition completely, you can use animation-timing-function: step-end (or steps(1,end); but you have to move your "target" state to the "middle" keyframe). . The non-step keyword values (ease, linear, ease-in-out, etc. Is a strictly positive <integer>, representing the amount of equidistant treads composing the stepping function. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. Easing functions are serialized using the common serialization patterns defined in with the following additional requirements:. For example, in the CSS below, blur (5px) is the underlying value, and blur (10px) is the effect value. */ steps(5, end) /* A two-step staircase, the first one happening at the start of the animation. A little known option for transition timing functions is the steps function. animatedobject { -webkit-animation-timing-function: linear; } and your animation will look more more less good, if a little robotic. You can apply CSS to your Pen from any stylesheet on the web. We’ll display it as a white box having a little shadow. 5. This parameter accepts one of the following two keyword values that map to predefined steps() functions or a. The count to determine if a cycle is even or odd starts at one. Ease-in and Ease-out: Animations with Ease-in start slowly and speed up until the animation cycle is complete, while Ease. transition-property. Complex method of animating certain properties of an element. Animation form, animation-timing-function. */ steps(2) These timing function are invalid :animation-timing-function动画播放方式，默认值ease，可以设linear，ease，ease-in，ease-out，ease-in-out，cubic-bezier(n,n,n,n)，steps。关于贝塞尔曲线和steps可以参照上一篇transition，和transition-timing-function类似，不多赘述。 animation-delay延迟开始动画的时间，默认值是0，表示不. By default, Tailwind provides utilities for four different example animations, as well as the animate-none utility. Pre- and post-animation state: animation-fill-mode, step 2. More drawings/frames between poses gives the viewer a slow and smooth action while fewer drawings/frames gives the viewer a faster and crisper action. I want to be able to change animation-timing-function and -webkit-animation-timing-function etc. animation-duration: 1. how the animation should proceed). The timing comprises many things in animation. Launching a factory, step 2. ". -webkit-animation-timing-function: steps(1,end); animation-timing-function: steps(1,end); See this jsFiddle. CSS3のanimation-timing-function: steps(n) が便利なのでGifアニメやJSを使用したPNGシーケンスはもう使わないようにしたいな、という話です。 例えば. If no animation-timing-function is specified on a keyframe, the corresponding value of animation-timing-function from the element to which the animation is applied is used for that keyframe. We’ll start with the number of steps (segments) the animation has and the deceleration between them. 25,0. The animation begins and ends gradually; this value is equivalent to cubic-bezier(0. I'm not sure if it is standard behavior either, but when you say that there will be only one step, it allows you to change the starting point in the @keyframes section. 其中ease是animation-timing-function的默认值。. */ steps(2) These timing function are invalid :The @keyframes rule allows developers to specify the intermediate steps or stages of an animation. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. I did the following code in SCSS (you can see in the pen above ). If no animation-timing-function is specified on a keyframe, the corresponding value of animation-timing-function from the element to which the animation is applied is used for that keyframe. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself. The animation-timing-function property specifies the speed curve of the animation. The transition jumps instantly to the final state. Within a keyframe, animation-timing-function is an at-rule. You can apply CSS to your Pen from any stylesheet on the web. If no animation-timing-function is specified on a keyframe, the corresponding value of animation-timing-function from the element to which the animation is applied is used for that keyframe. It is a shorthand for animation-name, animation-duration, animation-timing-function, animation-delay, animation-iteration-count, animation-direction, animation-fill-mode, animation-play-state, and animation-timeline. ease-in - starts slowly, but accelerates at the end and stops abruptly. Using this timing function, the animation jumps immediately to the. You can create a "fake" delay between infinite animations purely with CSS. Stopping and starting an animation: animation-play-state. This is a quick step we can perform to make our sites/apps friendlier and safer. This in-depth, step-by-step tutorial covers how to animate in PowerPoint showing the fundamentals of adding and modifying animations and then demonstrates advanced strategies like customizing timings, adding. We’ll display it as a white box having a little shadow. One way to specify the timing function is with a cubic Bézier curve. For example, use md:ease-in-out to apply the ease-in-out utility at only medium screen sizes and above. ease: animation-timing-function: ease; Chuyển động ban đầu sẽ chậm, sau đó nhanh, đến lúc kết thúc sẽ từ từ, đây là dạng mặc định. The above curve defines how the output (y. so as to maneuver her across the screen, we have a tendency to produce. 1 Answer. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. You might need to tweak the key frames something like below example for smoother transition. Given this, the property transitions from f(i1,i2,…,in) to f(f1,f2,. About External Resources. If no animation-timing-function is specified on a keyframe, the corresponding value of animation-timing-function from the element to which the animation is applied is used for that keyframe. Edit timing functions¶ When you create a CSS animation you can specify a timing function: this determines the rate at which the animation progresses. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. Then, the instruction showed my code didn’t pass. The non-step keyword values (ease, linear, ease-in-out, etc. extend. Full blown animations are of course the pinnacle of exciting visual experiences, and CSS3 provides ample tools to build cool experiences using familiar design patterns. The timing function describes how the animation process is distributed along its timeline. animation-timing-functionの値一覧. A JS-free solution would be to put the couting numbers actually in the HTML and then animate between those with. Easing functions may be specified on individual keyframes in a @keyframes rule. Lastly, we apply the animation to the text container using the shorthand animation property cause in this case we. animation-timing-function使用了三次贝塞尔（Cubic Bezier）函数生成速度曲线，可以让我们的动画产生平滑的过渡。. Note : When you specify multiple comma-separated values on an animation-* property, they will be assigned to the animations specified in the animation-name property in different ways depending on how many there are. This keyword represents the timing function steps(1, start). Los posibles valores son una o varias <timing-function> (en-US). CSSでアニメーションするには、keyframesとanimationプロパティの2つを組み合わせます。 keyframesでどのような時刻にどのような状態かを指定し、animationプロパティで時刻の変化の仕方を指定します。 The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. animation-timing-functionの設定方法. The timing function is not limited by Bezier curves. loading { animation-name: rotate; animation-duration: 3s; animation-timing-function: linear; animation-iteration-count: infinite; } For a reference of what each property and value means:Then, set the animation-timing-function to define how the animation progresses. If no animation-timing-function is specified on a keyframe, the corresponding value of animation-timing-function from the element to which the animation is applied is used for that keyframe. <step-easing-function> Specifies a steps() function that divides the animation into a set number of equal-length intervals or "steps", causing the animation. Serialization. CSS easing functions are pure functions that describes the rate at which a numerical value changes used to describe how fast values change during animations or to control the rate of change of gradient interpolation. In This Article. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. Animation Timing Function. The animations we include by default are best thought of as helpful examples, and you’re encouraged to customize your animations to better suit your needs. keyframes object, then add the animation to theme. World. transitionTimingFunction or theme. A @keyframes rule specifies the style. 4. step-start: Equivalent to steps(1, start) step-end: Equivalent to steps(1, end) steps(int,start|end) Specifies a stepping function, with two parameters. Linear Functions. typewriter ” selector. This may be specified in either seconds (s) or milliseconds (ms). Syntax animation-timing-function: <value>; where <value> can be one of the following keywords: step-start: The easing curve for an animation that starts quickly and. During the animation, you can change the set of CSS styles many times. These timing functions are valid : /* There is 5 treads, the last one happens right before the end of the animation. Timing functions defined as cubic Bézier curves get an icon in the Rules view. animation-name: Specifies the name of the keyframe you want to bind to the selector: animation-duration: Specifies how many seconds or milliseconds an animation takes to complete: animation-timing-function: Specifies the speed curve of the animation: animation-delay: Specifies a delay before the animation will start: animation-iteration. animation. The easing functions in the cubic-bezier subset of easing functions are often called "smooth" easing functions,. auto Experimental. Equivalent to steps(1, start) step-end: Equivalent to steps(1, end) steps(int,start|end) Sets a stepping function, with two parameters. You are free to choose the length. e. The way to do it is smartly define your keyframe animation points and your animation duration speed. Then, using. Each stop is a single number that ranges from 0 to 1. animation-timing-function 속성에 사용되는 타입이다. Its speed gradually increases because of gravity until it hits the ground. Easing functions may be specified on individual keyframes in a @keyframes rule. Like other CSS animations, we can use any supported timing function here, but we need to apply the same function for all animations (move1, move2, and move3) at the same time. About External Resources. React Native Animation is an interesting topic where a dull application could be converted into an interactive and beautiful app. animation-timing-function: steps(4, end); By using steps() with an integer, you can define a specific number of steps before reaching the end. The animation-timing-function property, when declared for the entire animation, allows you to define how an animation progresses over a single iteration of the animation. It must be a. animation-timing-function: steps(30, end) makes the animation play in a stepwise manner, instead of smoothly. For a keyframed animation, the animation-timing-function applies between keyframes, not over the entire animation. It is defined by a number of steps and a step position. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. Una de esas características nos informa del Animation. In the physical world, when a ball falls, it starts slow. net in kebab-case. You can apply CSS to your Pen from any stylesheet on the web. This means that your animation jumps directly to the last frame and misses out all of the intermediary positions. 2,1) or 1,0,0,1 - with short duration it is quite. The animation is created by gradually changing from one set of CSS styles to another. See full list on blog. It is the way actions. transition-timing-function: steps(8, end); Animations. There is. The animation timing function ease will cause the animation to start. Default. An easy fix is to simply change the timing function to ease. 1 Value Definitions. To show this we are going to begin creating a simple. By default, Tailwind provides four general purpose transition-timing-function utilities. @keyframes iconEnter 0% transform scale(0) 100% transform scale(1) animation-timing-function cubic-bezier(. where along the timeline an animation will start. 阶跃函数的时间曲线. I can hear you asking “What the hell does it even mean?”, let me show you an example. These functions describe the transition from one state to another. Easing functions may be specified on individual keyframes in a @keyframes rule. 1. I'm using this in my stylesheet in Harlowe 3. If a given animation time offset is duplicated, all keyframes in the @keyframes rule for that percentage are used for that frame. Sorted by: 1. animation-timing-function: steps(3, end) Values ease Default. Description. In other words, the timing function is applied at the start of the keyframe and at the end of the keyframe. The animation-timing-function can work with any of the easing functions, as well as three other timing. /* @keyframes duration | timing-function | delay | iteration. steps()函数原型为. 0s; Would automatically set the speed so the animation finishes in 20 seconds. 애니메이션을 적용하려면 애니메이션 이름을 반드시 설정해야 하지만, animation 축약의 모든 값은 선택 사항이며, 각 animation 구성 요소의 초기 값이 기본값입니다. 3. yes, lets say, when I press A, I would like to get the same effect that I already have when you click, it swap the classes and makes a switch, animation play, animation reverse, I did that calling default2 which plays and back which plays default2 in reverse. As you can see, the hand jumps to the 5-second. Initially, we have the common styles for all items defined under the . Within a keyframe, animation-timing-function is an at-rule. Learn to Code — For Free. In general, animation-timing-function is basically divided into two types of functions: 1. ). Using the previous “moving box” example, the following image does a far better job of explaining the. As you can see, the hand jumps to the 5-second. animation-timing-function: establishes preset acceleration curves such as ease or linear. The animation-timing-function property can have the following values: ease - Specifies an animation with a slow start, then fast, then end slowly (this is default) linear - Specifies. Demo: Syntax. Read about inheritThe transition-timing-function CSS property is used to describe how the intermediate values of the CSS properties being affected by a transition effect are calculated. About External Resources. Within a keyframe, animation-timing-function is an at-rule. If there are fewer timing functions. Arguably the most fundamental of the 12 principles of animation. Property Value: time: This value is used to specify the length of time for which an animation will complete one cycle. A value of steps(1,start) means that the animation has only one step and it happens right at the start of the animation itself. لطفا در ادامه با آموزش ویژگی animation-timing-function در CSS با من همراه باشید. This in essence lets you establish an acceleration curve, so that the speed of the transition can vary over its duration. Note: When you specify multiple comma-separated values on an animation-* property. Using the steps() function you can force the interpolation to be an exact number of keyframes. This acceleration curve is defined using one <timing. ) animation-timing-function.