animate-end { animation-iteration-count: 3; animation-duration: 1s; animation-timing. Within a keyframe, animation-timing-function is an at-rule. Example: width 1s linear 1s. animation web animation api css; Subscribe to get our latest content by email. It indicates that the interpolation starts slowly, accelerates sharply, and then slows gradually towards the end. 2+, Chrome, Firefox 4+, Opera 10. It starts slowly, accelerates through the middle part. Total animation time calculated by : 30s * 4 = 120s // 4 images having 30s. Easing functions may be specified on individual keyframes in a @keyframes rule. Cubic Bézier easing functions: ease, ease-in, ease-out, ease-in-out, cubic-bezier() A. Each stop is a single number that ranges from 0 to 1. timing-function – Sets how the animation moves along the timing “track”, ie ease, ease-in, linear, etc. The animation-timing-function sets the animation speed curve. in') ease (0. Use the cubic-bezier function to define a custom speed curve for the animation. CSS3's transitions and animations support easing, formally called a "timing function". Read about inheritTeams. See animation iteration count for more examples. If you omit a timing function from the call, the method uses the default timing function. animation. #myDIV { animation-timing-function: linear;} Click the property values above to see the result. ) We have four keywords to choose from: linear – as described above; ease-in – the animation starts off slow and accelerates as it progresses; ease-out – the animation starts off fast and. ease: slow in the beginning, fast in the middle, and slow at the end. Then I have an animation with a set of keyframes for how far along that animation should be at each phase of the animation: @keyframes circlePath { 0% { offset-distance: 0%; } 10% { offset-distance: 8. Using the steps() function you can force the interpolation to be an exact number of keyframes. It takes a string and returns the easing function. duration – Sets how long the animation runs from start to finish. First, you have to select 4 coordinates for constructing the cubic Bezier starting and ending points. Trusted by 200,000+ folks. CSS Syntax animation-timing-function: linear|ease|ease-in|ease-out|ease-in-out|step-start|step-end|steps (int,start|end)|cubic-bezier ( n, n, n, n )|initial|inherit; The animation. 58,1)) 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. In other words, the animation-timing-function property specifies the speed for implementing the animation at various intervals of its duration. the animation’s fill. 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. The syntax for the linear easing function is simply the linear keyword. /* @keyframes duration | timing-function | delay | iteration. In addition, timing functions are also reversed; for example, an ease-in animation is replaced with an ease-out animation when played in reverse. #myDIV { animation-timing-function: linear; } Click the property values above to see the result. ease-in: starts slow and then speeds up as it moves to the end. timing () to convey physically believable motion in animations. mySelector must specify a timing function (here, linear) in order for that timing to be used on the 0%-25% tween. Similarly, ease-out means it starts fast but finishes slowly. See full list on blog. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. answered Aug 11, 2016 at 12:06. animation-play-state: running. The interpolation occurs at a constant rate from beginning to end. animation-timing-function: <value>; where <value> can be one of the following keywords: step-start: The easing curve for an animation that starts quickly. 0. 25, 1); These functions are often called easing functions. Simply changing the ease can adjust the entire feel and personality of your animation. 5k 12 73 77. The timing function is not limited by Bezier curves. The animation starts quickly, and decelerates gradually until the end. Example of an easing function that produces an ease-in effect. To create multiple animations using CSS animations, we can enter all of the properties we want to animate in one @keyframes at-rule and use it in an animation property, as seen in the following code snippet:. Hover me. Linear transitions work well for simple animations, while ease-in-out is best for. 5*0. Within CSS & many other programing languages there are predefined easing curves . In CSS, you can choose to change the default uniform animation pace and specify a custom easing function that controls the animation, using the animation-timing-function property. If you don’t quite like the easing, grab a handle and fix it. Within a keyframe, animation-timing-function is an at-rule. Ceaser. There are infinite eases that you can use in GSAP so we created the visualizer below to help you choose exactly the type of easing that you. How you calculate it is simple: 100 / #_seconds = percentage in animation for 1 sec e. 4. The animation-timing-function, which is not as obvious in its meaning as the previous two properties, is used to define the manner in which the CSS animation progresses. 885, 0. box { animation-name: move; animation-duration: 2000ms; animation-timing-function: ease-in; } Let's recap on some established CSS easing techniques. The trick is, put your transition in the initial state, in this case div#welcome h1 img then you put the end result in the action state, that is, the :hover style. animation-delay: durasi tunda ebelum animasi kita mulai. 背景色変更アニメーションでイージングを比較In This Article. animation-timing-function: linear. I've used the "Easy Ease" to create an okay looking transition, but I would like to use this timing function (from CSS): cubic-bezier(0. The ease keyword is the default value of the CSS timing-function property, and it is actually quite similar to the previous one, although it eases in at a faster rate before easing out much more gradually. It defines the total duration of a transition from state A to state B, whether the transition involves scaling, distorting, rotating or modifying the style of an element. You want to effectively use something like ease-out as your object shoots up, and like ease-in as it starts falling back down. background, transform; transition-timing-function: ease-out, ease-in, linear, ease-in-out; transition-delay: 0, 0, 0, 1s; transition. animation-timing-function: establishes preset acceleration curves such as ease or linear. on mouse hover. This property determines how an animation will progress over time, and can be used to create a variety of different effects. In this example, the slide animation is applied to a div element, causing it to move back and forth horizontally indefinitely with a duration of 2 seconds and an easing timing function. World. The <single-transition-timing-function> CSS data type denotes a mathematical function that describes how fast one-dimensional values change during transitions or animations. animation-timing-function: ease-out;} to {background-color: rgba(255,204,0,0);}} You can set animation-timing-function on each keyframe except the last one (100% or to). The animation property is one of the CSS3 properties. By manipulating these animation properties, you can fine-tune the duration, delay, iteration. 42, 0, 1. Every one second, the element will move 10px to the left and 10px down, until the end of the animation, and then again in reverse forever. It moves up at 33% and down at 66%. slideRight { animation-name: slideRight; animation-duration: 1s; animation-timing-function: ease-in-out; visibility: visible !important; /* New code here: */ animation-delay: 1s; } It's important to note that animation-delay only delays. You want to set your animation curve to be linear: -webkit-animation-timing-function: linear; /* Chrome, Safari, Opera */ animation-timing-function: linear; This will ensure that your animation runs smoothly: jsfiddle. この記事は普段transition-timing-functionの値に なんとなくease、ease-in、ease-out、ease-in-outを設定している方に読んでいただきたい内容になります。. but the cubic bezier curves associated with these two keywords are not exactly parabolas. animationName returns the animation name as stated in the CSS. This function accepts a number of stops, separated by commas. What are CSS Animations? An animation lets an. ease-out. Hello. 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 function parameters allow you to select the scroller, and the scrolling axis the timeline will be measured along. We're also setting the easing (animation-timing-function) to linear so that it progresses smoothly in line with scroll. 5. Example: ease. The animation shorthand CSS property applies an animation between styles. The animation-timing-function is used to determine the timing function applied to each keyframe as defined in § 3 Assembling Keyframes. This is ridiculously fun, of course. The non-step keyword values (ease, linear, ease-in-out, etc. Class Properties; animation-linear: animation-timing-function: linear; animation-ease-in: animation-timing-function: cubic-bezier(0. or if you want to have a. For example, the linear keyword will animate at an even speed. In between each stop the interpolation is done in a linear way, explaining the name of the function. animation-delay - default 0s. programmatically in JavaScript. animation-iteration-count = infinite. You can use our built-in easings by passing them as the easing property to the withTiming config: import { Easing } from 'react-native-reanimated'; withTiming(sv. To properly animate objects over a curved path , or even an arbitrary path, you will need to use JavaScript to control the animation. First image start with 0s (0s - 30s) Second image start with 30s (30s - 60s) Third image start with 60s (60s - 90s)Easing functions may be specified on individual keyframes in a @keyframes rule. All the Timing Functions Defined in CSS. You can also choose from many preloaded easing functions by simply selecting them from a select box, choose the duration and then click the effect buttons (left, width, height. 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. Result: CSS Code: #myDIV { animation-timing-function: ease-in; } Click the property values above to see the result. Homework. For example, in the case of an ease-in-out timing function, an animation will ease in at the start of the keyframe and ease out at the end of the keyframe. css. Easing functions may be specified on individual keyframes in a @keyframes rule. ease-in-out: Timing function. animation-play-state - default running. I am working on a game that needs an animation to play when I call a function. Choose an easing type and test it out with a few effects. You can create a "fake" delay between infinite animations purely with CSS. This value sets the animation to a slow start then after a time period the speed increases and before it ends the speed again becomes slow. The steps () functional notation defines a step function dividing the domain of output values in equidistant steps. 3s ease; } h1:hover { -webkit-transition:all 0. 7, the easing function scales the value to produce an output progress of 0. The transition-timing-function property specifies the speed curve of the transition effect. transition-timing-function. 0% { transform: translateY (0px); animation-timing-function: ease-out; }animation. My question is: is there a way to combine the two or chain them? something on the lines of:-webkit-animation-iteration-count: 1, infinity; -webkit-animation-timing-function: ease-in, linear; the former does not work btw. ease-in - starts slowly, but accelerates at the end and stops abruptly. the animation’s start and end delay. and to exit with a quicker ease-in animation: This is a small detail, but it speaks to a much larger idea. the animation’s easing (or timing function). I'm following this tutorial here. Something in the context of CSS timing-functions is always a CSS property that can be animated - that's a property that can be denoted with a numerical value, like: width, height. ; ease-out will start the animation at full speed, then finish slowly. 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. Home; CSS; CSS Animations; Tryit: Using the animation-timing-function property To control an element's transition-timing-function at a specific breakpoint, add a {screen}: prefix to any existing transition-timing-function utility. The animation-composition property helps to specify how to combine the underlying value with the effect value. Within a keyframe, animation-timing-function is an at-rule-specific. In a CSS animation, you can specify your timing function as part of the shorthand animation property, or by setting the animation-timing-function property directly. You don’t have to use a single easing for both directions of an animation, you can switch it up; You can change duration also;Home; CSS; CSS Animations; Tryit: Using the animation-timing-function propertyResponsive. ease-in: animation. Delaying the start of the animation is very simple. The CSS ease-in-out timing function looks like in the illustration below:animation-timing-function:. The ease timing function is the default of any transition in CSS. The trick is, put your transition in the initial state, in this case div#welcome h1 img then you put the end result in the action state, that is, the :hover style. – Zaki Mustafa. Easing functions may be specified on individual keyframes in a @keyframes rule. animation-timing-function: linear (0, 0. The idea is to loop over a set of keys and generate a block of CSS with linear () easings. In other words, t is the same as animation progress. This example makes a sequence of two ease-in and ease-out transitions resemble the behavior of a single ease-in-out function: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. 16. Here’s the box with the easing function turned on: See the Pen Bouncing Box 2 by Brandon Gregory (@pulpexploder) on CodePen. I'm really new to After Effects, and I am used to creating CSS animations. Within a keyframe, animation-timing-function is an at-rule-specific. Cú Pháp. inOut () Makes any easing function symmetrical. 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. animation-timing-function: linear. Adding animations and transitions to websites has been a lot of work, but this article will show you how to easily achieve those tasks with Tailwind CSS. Sorted by: 2. CSS Syntax animation-timing-function: linear|ease|ease-in|ease-out|ease-in-out|step-start|step-end|steps (int,start|end)|cubic-bezier ( n, n, n, n )|initial|inherit; The animation-timing-function uses a mathematical function, called the Cubic Bezier curve, to make the speed curve. The ease timing function is so nice, perhaps, because it’s a variant of ease-in-out. It can assume the following values: ease - (default) starts slowly, then becomes faster, and ends slowly. myDiv { animation: bounceIn . However for some reason my images seem to fade over each other too fast and I can't control the timing well. Within a keyframe, animation-timing. Ease In spacing: Ease Any frame that needs to be slowed down, or more specifically, any frame that needs to be halted, can be utilized within spacing. This useful cubic bezier function utility allows you to create your own custom curve and the see the result applied to various animations. If you use steps (10) in your animation, it will make sure only 10 keyframes happen in the allotted time. animation-timing-function = ease D. Use the ease-{timing} utilities to control an element’s easing curve. The class specifies the animation duration in milliseconds, and the class indicates that the Y position of the element should be animated using a translation transformation. Easing animation is usable on User Interface (UI) elements such as the following: Buttons. . In other words, the timing function is applied at the start of the keyframe and at the end of the keyframe. To learn more, see the Color Schemes documentation. ease-in - starts slowly, but accelerates at the end and stops abruptly. ease-in. Use an animation timing function to control the pace of an animation transition when you call one of an entity’s animated move methods, like move (to:relativeTo:duration:timingFunction:). It wouldn't move at the same speed the whole time: it would probably accelerate rapidly to its maximum velocity, before gradually slowing down and coming to a stop (known as cubic-bezier easing). . Unsubscribe at any time. CSS3 provides several built-in timing functions, such as ease-in, ease-out, linear, and cubic-bezier, which can be used to create various effects. I have a confession to make: the demonstrations above, showing the different timing functions, were exaggerated. 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 Safari position on the proposal is positive. This, in essence, lets you establish an acceleration curve so that the speed of the transition can vary over its duration. As with transitions, the choice of timing function can greatly impact the feel of an animation. 25, 0. The W3Schools online code editor allows you to edit code and view the result in your browserThe W3Schools online code editor allows you to edit code and view the result in your browserA new way to define an easing in CSS is with linear(). Let’s see more of them. 此外，還有許多不同的 timing functions 供你選擇，請見 transition-timing-function。 用貝茲曲線定義 timing function. To have more control over the animation paths and timing, you can set up WebKit Keyframes. The easing function that corresponds to a given animation, as determined by animation-name. animation-timing-function: step-start;The animation-composition property helps to specify how to combine the underlying value with the effect value. 4, 0, 1, 1); animation-ease-outSpecifies the duration of the transition. An animation-timing. linear: The linear timing function provides a constant speed throughout the animation or transition. the type of animation: CSS transition, CSS animation, or Web Animations API. The easing (or timing function) of an animation is what dictates the way it progresses through time. Easing Functions. animation-direction - default normal. We saw the simplest, linear timing function above. If no timing function is declared, the transition will default to using the ease function. 06. Simply add the animation-delay property to your code: . The animation-timing-function is specified using a cubic bézier curve, which is defined by four control points; P 0, P 1, P 2, and P 3. During a view transition, ::view-transition-group is included in the associated pseudo-element tree as explained in The view transition process. Use the linear, ease, ease-in, ease-out, or ease-in-out values to specify a predefined speed curve for the animation. 0, 1. The nature of these keyframe animations can be altered by tweaking its properties such as duration, easing function, direction, delay, and more. Read about initial: inherit: Inherits this property from its parent element. Example: animation keyframes range from 0% – 25% – 75% – 100%, and use ease-in-out as the timing function. A cubic-bezier timing-function describes the change of something over a period of time, so the coordinates of our handles are (time, something) pairs. 1, . Example: 1s. Example: HTML Program to illustrate the above property values for the animation-timing-function property. Options include: linear, ease, steps, and cubic-bezier. 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. This acceleration curve is defined using one <easing-function> for each property to be transitioned. An easing curve is a line that defines the acceleration pattern on a graph. This will make your element use the keyframes from 0% to 100% for the specified duration then go from 100% to 0% after the first iteration is complete. You’ll see these in action in the next section. This timing function is often used to create animations that appear to build up momentum over time. These two timing-functions are symmetrical. transition-timing-function: step-end; The transition stays at the initial state until the end, when it instantly jumps to the final state. Try it. And draw can go beyond properties, create new elements for like fireworks animation or something. animation-timing-functionの設定方法 2. animation-timing-function = <easing-function> # <easing-function> = linear | <linear-easing-function> | <cubic-bezier-easing-function> | <step-easing-function> <linear. Profile or Media card. ease. Utilities for controlling the easing of CSS transitions. 0) and (0. transition-timing-function: ease; transition-timing-function: linear; transition-timing-function: step-end; transition-timing-function: steps(4, end); I hope in the future we get more. 5 = 0. The animation-timing-function property is one of the CSS3 properties. Jul 7, 2023For keyframed animations, the timing function applies between keyframes rather than over the entire animation. 25, 1. Note: If you do not specify animation-duration property, the default value is 0s, resulting in the animation not being played. Connect and share knowledge within a single location that is structured and easy to search. 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. ease-in-out - starts slowly and ends slowly. animation-timing-function: ease-in-out; Specify the Fill Mode for an Animation (Animation-Fill-Mode) There are four possible options for the fill mode: "none": It is the default value, which means that the element will return to its original state once the animation has finished. js, we have a property named easing that we can use to specify the easing function to use for the animation. You can supply an easing function, a keyword, or a comma-separated list of easing functions. Hasta ahora hemos visto todas las propiedades de tiempo, función, iteraciones, etc… para añadir la animación a una clase, pero, ¿dónde creamos o definimos la animación?. CSS3におけるanimation-timing-functionプロパティの意味と使い方、値の指定方法、サンプルコード、使用例について解説します。. The steps is one of the timing ( easing) functions available ( and you cannot use multiple easing functions ). This, in essence, lets you establish an acceleration curve so that the speed of the transition can vary over its duration. An example animation would look like this: transition-timing-function: cubic-bezier(0. A string defining the timing function to use for easing transitions during the animation process. 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. ; ease-in. inOut () Makes any easing function symmetrical. See Answer. The animation-iteration-count property specifies the iteration count of the animation’s associated. @keyframes fade-in { 0% { opacity: 0; } 100% { opacity: 1; } } . Just like other CSS properties and modules. If you want all the animations to occur at the same time, simply combine the keyframes. 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. When it comes to animating elements on a web page, the CSS property animation-timing-function is an another important property to understand. 16. If you don’t specify animation-timing-function for a keyframe, the default ease is used. The latter can be created using a tool such as this tool by Lea Verou. ease-in. This, in essence, lets you establish an acceleration curve so that the speed of the transition can vary over its duration. transition-timing-function: steps (4, end); By using steps () with an integer, you can define a specific number of steps before reaching the end. animate { background. A typical use of the linear() function is to provide many points to approximate any curve. That is, the change happens slowly both at the beginning and end, and speeds up only in the middle somewhere. Use the select input to choose one of the seven keyword values. animation-play-state = running C. This may be specified in either seconds ( s) or milliseconds ( ms ). It can assume the following values: ease - (default) starts slowly, then becomes faster, and ends slowly. where along the timeline an animation will start. 4s: Duration. This acceleration curve is defined using one <easing-function> for each property to be transitioned. ease is the animation-timing-function property's<easing-function> は CSS のデータ型で、数値が変化する速度を記述する数学的な関数を表します。 この 2 つの値の間の遷移は様々な形で適用される可能性があります。アニメーション中に値が変化する速さを記述するために使用されることがあります。animation-timing-function (en-US): ease; animation-delay: 0s; animation-iteration-count (en-US): 1; animation-direction: normal; animation-fill-mode: none; animation-play-state (en-US): running; animation-timeline (en-US): auto; 적용대상: all elements: 상속: no: 계산 값: as each of the properties of the shorthand: animation-name (en-US. viii. Finally, the ' animation-iteration-count ' property sets the animation to repeat indefinitely. but the cubic bezier curves associated with these two keywords are not exactly parabolas. The Easing module implements common easing functions. Read the docs about The steps () class of timing-functions. When the mouse stops hovering, the -webkit-animation property returns to its default value (blank), which means that the shake animation is removed, and everything returns to how it. If an element moves,. Here's a gif of the behaviour (it's a bit ugly because of my gif-record-software, but the pause is the thing I wish to highlight here): . ) correspondent à une courbe de Bézier cubique fixe avec quatre valeurs prédéfinies; La fonction cubic-bezier() permet de paramétrer une courbe spécifique. If no timing function is specified for. Its parameters are: The DOM element to be animated, or null. 目次. The steps() easing function lets you break the timeline into defined, equal intervals. ) each represent cubic Bézier curve with fixed four point values, with the cubic-bezier(). Set the 'delay' with an high value on the element (not :hover). 5s inverse (ease) reverse; }For example, in the case of an ease-in-out timing function, an animation will ease in at the start of the keyframe and ease out at the end of the keyframe. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. the Playback rate of the animation. To use the ease-in timing function in Core Animation, you can set the timingFunction property to CAMediaTimingFunction(name: . The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. 5s; animation-timing-function: ease-in-out; transform-origin: 24px 10px; animation-fill-mode: forwards. There are several presets available in CSS which are used as the value for the animation-timing-function like. The animation-timing-function CSS property sets how an animation progresses through the duration of each cycle. I believe you're looking for animation-direction:alternate, but your question is not very clear. transition-delay Defines when the transition starts. 1, . World. In CSS, we use the animation-timing-function property to apply easing to an element's animation. ease. js are necessary. Therefore in the most common case, the result will be something like this. . The way to do it is smartly define your keyframe animation points and your animation duration speed. All the examples so far have the “linear” timing, what about easing or other timing functions? Note: By “linear” we mean the variable t of the curve linearly changes from 0 to 1. Other timing options include ease, ease-in, ease-out, ease-in-out, and linear. In this playground, both spinners complete 1 full rotation in 2 seconds. サイト制作・運営. This, in essence, lets you establish an acceleration curve so that the speed of the transition can vary over its duration. You can apply CSS to your Pen from any stylesheet on the web. An example of a cubic-bezier function that bounces would be. For example, in the case of an ease-in-out timing function, an animation will ease in at the start of the keyframe and ease out at the end of the keyframe. The transition-timing-function property can have the following values: ease - specifies a transition effect with a slow start, then fast, then end slowly (this is default); linear - specifies a transition effect with the same speed from start. 25, 0. Its default resets on each cycle. これは ease-in-out と似ていますが、始めのうちはより急激に加速されます。. Hi I am trying to move a image up the screen using CSS. transition-timing-function. Easing functions can change the look and feel of an animation by affecting the rate, or speed, of an animation. A timing function in CSS is usually referred to easing functions. }); }); Easing is the primary way to change the timing of your tweens. 0% {background-color:red;} } I've tried fiddling around with opacity settings with no luck. value, {. Easing functions may be specified on individual keyframes in a @keyframes rule. The W3Schools online code editor allows you to edit code and view the result in your browserLa propriété animation est une propriété raccourcie qui permet d'appliquer une animation entre des styles. ease-in-out. 45); [ See working in JSFiddle] _____ CSS3 animation-timing-function 属性 实例 从开始到结束以相同的速度播放动画: [mycode3 type='css'] animation-timing-function:linear; -webkit. This is the default. Within a keyframe, animation-timing-function is an at-rule. Using those custom-easing functions in the animations can lead to an improved impression on users and a more delightful user experience. com transition-timing-function linear timing function. 0), the transition speed of the animating property begins slowly and increases. The ease-in timing function starts the transition. Shorthand property to specify the 4 aforementionned properties at once. 42,0,0. If you set a timing function on the ending keyframe, it’s ignored. Honestly, this feels right to me. The timing function can be one of a few predefined keywords, or a cubic bezier function.