Extension Settings. Custom and predefined easing functions, delays, durations, decay factors, spring constants, and more can all be tweaked depending on the type of animation. We’ve looked at a lot of theory to understand this one-line definition of easing!. The examples below represent a small range of what you can do with CSS animation. Easing out is typically the best for user interface work, because the fast start gives your animations a feeling of responsiveness, while still allowing for a natural slowdown at the end. The only easing implementations in the jQuery library are the default, called swing, and one that progresses at a constant pace, called linear. These functions are often called easing functions. Les valeurs avec des mots-clés (ease, linear, ease-in-out, etc. Easing functions may be specified on individual keyframes in a @keyframes rule. 1. When combined with the power of Sass loops, you can create really interesting animations with a few lines of code. linear animations move at a constant speed. Use the generator’s inputs to control the movement as you please, copy the output code, and use it in your project to add elasticity to your. " Default easing. js. Visualize. CAUTION: There’s a potential for confusion in this terminology. animate() method. It is defined by a number of steps and a step position. Resumen. . The speed curve defines the TIME an animation uses to change from one. In CSS, transition and animation properties allow you to pick the easing function. 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. CSS Cubic Bezier Generator is a free online tool for generating CSS code for cubic bezier easing functions by getting info about the animation from time vs progress graph or directly previewing the animation. It may be used to describe how fast values change during animations. In the same way you can define in CSS cubic-bezier(0. In CSS, this function can be implemented using @keyframes:Easing functions are widely applied in Cascading Style Sheets (CSS) . This method changes an element from one state to another with CSS styles. The frame function would at maximum be executed every frame, But of course the browser could decide to drop/skip frames if it needed, The browser itself could work out how much rounding would happen. The only thing the script could do is return a value 0-1 obviously overshooting 1 if the ease necessitated. Each keyframe describes how the animated element should render at a given time during the animation sequence. Here’s that same animation with easing applied: To add easing to an action, simply select the action and choose the easing type from the dropdown. Within a keyframe, animation-timing-function is an. CSS Animations Generator. slide-down { height : 60px; } #a{ transition: height 200ms }I can get a custom easing function as a function (as numbers), but I don't know how to convert named easing functions such as ease-in into numbers. ru. So far. タイミング関数は @keyframes ルール内にあるそれぞれのキーフレームに指定されることがあります。. Les valeurs avec des mots-clés (ease, linear, ease-in-out, etc. Here's what you'd learn in this lesson: David adds an initial animation to illustrate how easing affects how the animation plays. 5. transition: <duration> <property> <delay> <timing-function>,. Given an input progress of 0. For example, use md:ease-in-out to apply the ease-in-out utility at only medium screen sizes and above. It's SVG animation made easy - Create impressive SVG animations online, without any coding skills. The string representing an easing function specifies the speed at which the animation progresses at different points within the animation. While there’s a number of easing functions that alter the flow of an animation, there’s no ability to directly use springs. We can create even more life-like effects with cubic-bezier(), like making an element overshoot its end position slightly before coming to rest. You have to use CSS animations with animation-iteration-count:infinite. Cubic Bezier Curves. They can be used to animate any number of properties on a control, using any number of keyframes to define the states that each property must pass through. An Interactive Guide to CSS Transitions. The function takes four values, which correspond to two control points of a cubic bézier curve. Timing Functions in CSS Animations. Essentially we're going to use GSAP's TweenLite library to apply easing functions to our state's changes and let Vue's. As human beings, we are accustomed to a natural, non-linear motion. License. 8, 2); } Play. The short answer is that your animation can stutter or halt altogether, which isn’t great for UX. For more dynamic movements, Saola Animate offers up to 40 timing functions. (The same options are available for transition-timing-function. The Most Popular Easing Functions. Now let's have a look at timing easing functions. If this is your. @keyframes glow { 100% { outline: none; padding: 3px 0 3px 3px; margin: 5px 1px 3px 0; box-shadow: 0 0 5px rgba (81, 203, 238, 1); } } . Temporary policy: Generative AI (e. Es decir, se aplica al comienzo del. In between each stop the interpolation is done in a linear way, explaining the name of the function. For the easing function, we would supply values to a cubic-bezier() to emulate the wave-like curve. Type: Function() A function to call once the animation is complete, called once per matched element. An easing function has typically looked something like this:As you can see, there are lots of possible options and variations for animation easing functions and we’ll take a look at them next. in') ease (0. Depending on your browser limitations (and if you're using CSS3 you should be ok regardless), you can actually apply easing transitions with the cubic-bezier (). We can use trigonometry in the tweening (animated) property or in the easing function. 5 will start their playback exactly when the document timeline’s currentTime property equals 1000. This, in essence, lets you establish an acceleration curve so that the speed of the transition can vary over its duration. The CubicIn easing function slowly accelerates the animation. CSS Animations and Transitions. I'm fairly certain now it could just be done with css3 and don't need javascriptEasing. Easing. The Animation ShorthandEach keyframe describes the values of one or more CSS properties at that point in time. Applying this easing function to an animation would cause it to progress more slowly at first but then gradually progress more quickly. CSS animation is powerful. You can use the properties in the animations module to control the duration,. easing function: ease-in-out. (The same options are available for transition-timing-function. 4. GreenSock has a lovely utility method called parseEase. animate(), each property can take an array as its value: The first member of the array is the CSS. 52. This page helps you choose the right easing function. Value DefinitionsThe easing curve can make or break any animation on the web. Easing functions can be set by setting the name of the desired function to the Animation's Easing property. . The <easing-function> CSS data type represents a mathematical function that describes the rate at which a value changes. In this article, I’ll share my interesting findings on Bézier curves. You can also find its usage in the glsl-transition examples. css ( {opacity:0}); $ ("#map"). Hopefully these demos inspire you to use steps() effortlessly in your CSS animations. The method accepts 2 arguments, an array of objects which represent keyframes in the animation, and another object containing timing options like easing, and fill. 2, -2, 0. Web Animations API gives us a new dimension of control. At the instants it is called, x and t both say what the time is now, relative to the start of the animation. g. The transition-duration CSS property sets the length of time a transition animation should take to complete. The <easing-function> CSS data type represents a mathematical function that describes the rate at which a value changes. Step 5: Combining Animations. The CSS for the custom curve is: transition: transform 500ms cubic-bezier(0. css animation timing/easing function only effective the first time Ask Question Asked 5 years, 6 months ago Modified 5 years, 6 months ago Viewed 621. There are three main types of easing functions that can be used in CSS: Linear functions (linear), Cubic Bézier functions (includes ease, ease-in, ease-out and. However, I would repeat what Duopixel says about mixing easing curves and fixed checkpoints - in this case you shouldn't actually need animations, just two 0%:100% animations - one for the parent and one. 5, -0. Easing functions specify the speed at which an animation progresses at different points within the animation. The Compass Ceaser Plugin allows us to specify the easing function by its name, and Compass. TranslateHere’s an example that shows how harsh a standard linear-gradient () can be compared to how smooth we can make it by easing it: Screencap from “The Good, the Bad and the Ugly” with gradients overlaid. Sep 17, 2012 at 11:20. , ease, linear, ease-in, ease-out, ease-in-out). A cubic bezier is defined by four points (x1, y1, x2, y2). This works very well and very smooth. Timing functions are defined in the separate CSS Easing Functions module [css-easing-1]. Before we do that, let's just put our duration back up to about 500. css animation usully execute animation at the first time when the page has loaded. You can use predefined easing functions or create custom ones with cubic-bezier. Actually you don't need a JavaScript library to support complex easing functions like bounce-ease-in or elastic-ease-out. Scroll to the Top widget. When the animation runs, the renderer, in this case CSS in the browser, will tween the object from the one keyframe position to the next. Once you reach the top of the page, the party needs to stop. Choose an easing type and test it out with a few effects. 2. 8. to() tween will start at the element's current state and animate "to" the values defined in the tween. The cubic-bezier () function is used in CSS transitions to create a custom cubic Bézier curve. Vue will detect if any CSS animations or transitions are being used and will automatically toggle classes on the transitioned content, allowing for a perfectly timed transition system and complete control. The natural flow and pace of the application. Overusing animations can lead to a cluttered and distracting user experience; Timing and easing: The timing and easing functions of your animations should be carefully crafted to create a more user-friendly experience. This can give fine-grained control over the feel of an animation. params − A map of CSS properties that the animation will move toward. The <easing-function> CSS data type denotes a mathematical function that describes the rate at which a numerical value changes. You’ll see these in action in the next section. Setting the animation-direction property to alternate provides the second half of the movement. 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. The value must be one of those. In the example above, the sun (which is just an animated GIF) is in the center, so let’s move Saturn to be right on top of it: . 42, 0, 0. 4. Within the set of. About the above-mentioned examples, the animation is best applied during user interaction, e. Note: Different easing options are available for text effects. <single-easing-function> Determina o tipo de transição. You can set easing functions to control the rate at. One such tool is the CSS Easing Animation Tool , so let's use that to calculate our timing function. Responsive. 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. Within a keyframe, animation-timing-function is an at-rule. Box alignment in block layout (en-US) Box alignment in flexbox (en-US) Box alignment in grid layout (en-US) Box alignment in multi-column layout (en-US) Box model. complete. For example, you may want to animate two CSS properties but use a different easing function for each one. Here's the CSS3 Animation Generator tool which generates the keyframes for you, and enables 12 additional easing functions not supported by the w3c spec:The cubic-bezier() function affords us much more control over easing in our animations in CSS. In CSS, easing functions can be applied to individual keyframes in a @keyframes rule or to the entire animation using the animation-timing-function property. EDIT 2014: This article ends up in an updated library available on NPM (bezier-easing) and available on Github. Default value: Try it. Read the docs about The steps () class of timing-functions. Include the easing property for a keyframe in the same way you would include the offset property. 946); The first two numbers are the X and Y coordinates of the first control point, and the second two numbers are the X and Y coordinates of the second control point. This lets you establish an acceleration curve, so that the speed of the animation can vary over its duration. Each stop is a single number that ranges from 0 to 1. All of these functions can be used on CSS to a more natural feel to your keyframe transitions. . e. Animations are to be used with the animate directive. ə. Works with other animation libraries (animejs, framer motion, motion one, @okikio/animate, etc. This may be specified in either seconds ( s) or milliseconds ( ms ). Mimic CSS animation with JavaScript Function. scrollTo function that contains our easing function definition that are the most important to ensuring our scroll to the top of the page functionality is nicely animated. I cover easing functions in much greater detail in the Easing Functions in CSS3 tutorial, so go there for full coverage on this. You can control the individual components of the transition with the following sub-properties: (Note that these transitions loop infinitely only for the purpose of our examples; CSS transition s only visualize a property change from start to finish. transition properties allow elements to change values over a specified duration, animating the property changes, rather than having them occur immediately. 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. Jquery easing and animation. Easing functions specify the speed at which the animation progresses at different points within the animation. g. Easing wont work? 0. easing: specifies the easing function that should be used to control the rate of change of the tween over time render : specifies the function that should be called at each step of the tween animation; this function is responsible for updating the target element’s style properties to reflect the current state of the tween animationThe CSS declaration remains acceptable in both circumstances. I think the easing function's something out easeOutBounce, but like some confirmation on that. A . CSS animation easing is a set of animation functions also called timing functions. Select an easing function to show its Bezier curve notation. The common ones are ease-in, ease-out, ease-in-out, ease, and linear, or you can specify your own using cubic-bezier(). This function returns a css property, easing, and duration. ease-in. Syntax. g. It is worth considering the appropriate connecting curve used in computer graphics and animation-curves derived from the set of easing functions [9, 11]. Transforms are not the only thing we can animate, however. It supports multiple programming languages and game development frameworks. Easing Function Generator. We can create even more life-like effects with cubic-bezier(), like making an element overshoot its end position slightly before coming to rest. 1. Animated provides several animation types, the most commonly used one being Animated. sin(t/d * (Math. The animation property is the short-hand to the 8 stand-alone animation properties described below: animation-name name of keyframe specified by @keyframes rule. CSS Animation Properties. With three control points, it. The easing functions are the same as those described in. If that property is something like a vertical distance. It may be used to describe how fast. ) We have four keywords to choose from: Easing out causes the animation to start more quickly than linear ones, and it also has deceleration at the end. Use @starting-style to apply a style that the browser can look up before the element is open on the page. It supports animating a value over time. Google Web Designer gives you the five standard easing functions defined in the CSS3 specification, as well as step transitions and a custom easing option in Advanced mode. CSS Elastic ease generator. # Step 2: Build CSS Animations on the fly. Setting the animation-direction property to alternate provides the second half of the movement. 34, 1. parseEase ('power1. An animation lets an element gradually change from one style to another. EffectTiming object. Unfortunately, they don’t support all easings and you must specify the desired easing function yourself (as a Bezier curve). We've spoken a little bit about easing functions, and the keywords we can use, but those aren't the only ones we can use. Easing Cheat Sheet for jQuery, CSS, SCSS; Easing Function Generator; LearnRobert Penner's Easing Functions. Here is the description of all the parameters used by this method. # The @starting-style rule for entry animations. By using basic CSS transforms, such as scale and rotate, with animation delays, the keyframe animations really come to life. ) or the Web Animation API (WAAPI). animation-timing-function: linear (0, 0. The <easing-function> CSS data type denotes a mathematical function that describes the rate at which a numerical value changes. linear animations move at a constant speed. You may specify multiple easing functions; each one will be applied to the corresponding property as specified by. Animations can move linearly, smoothly, or even bounce rapidly back and forth. from and to will be each set of values, for instance given an output range ["#000", "#f00", "#333"] two mixers will be created, one between "#000" and "#f00" and. Both are applied to the same element in parallel, but run independently of each other: The Easing class defines a number of easing functions that can be consumed by animations: The BounceIn easing function bounces the animation at the beginning. 1000, easing. slide-up { height : 30px; } . You saw a fair amount of this in my Easing Functions in CSS3 tutorial, and I won't repeat a lot of the conceptual information you saw there. The steps () functional notation defines a step function dividing the domain of output values in equidistant steps. cubic-bezier() Easing function that defines a cubic Bézier curve. You could quite literally think of cubic-bezier as a function that accepts exactly. If no other value is assigned, the function will be set at ease by default. As of jQuery 1. . The second parameter, which is optional, is either the value "start" or "end", and specifies the point at which the change of values occur within the interval. Note that this behavior of transitions not applying to the cascade when an animation on. In other words, t is the same as animation progress. CSS transitions are generally best for simple from-to movements, while CSS animations are for more complex series of movements. Easing is important stuff when it comes to animations and transitions. In the Easing Animation dialog that appears, select the easing you want. If you’re taking. To learn more about easing functions, check out the Easing Functions in CSS article where everything mostly applies to the animate world as well. com. Step 4: Animation Direction and Fill Mode. glow-border { animation-name: glow; animation-duration: 0. CSS transitions let you decide which properties to animate (by listing them explicitly), when the animation will start (by setting a delay), how long the transition will last (by setting a duration), and how the transition will run (by defining an easing function, e. During the animation-delay, the animation-timing. But the other aspect of the CSS animation that we're gonna be going through in this course is transforms. linear The linear function is equivalent to cubic-bezier(0, 0, 1, 1). To keep things simple, there are predefined keywords you can use e. The easing function will run forwards for half of the duration, then backwards for the rest of the duration. <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。1. 0. js ( /ˈæn. Il buono (the good): Smooth gradients in CSS that blends into their context. Tip: More easing functions are available in external plugins. Non-linear easing is what gives animations a more natural, life-like feel. Contributing. inOut () Makes any easing function symmetrical. In CSS, if you applied animation-timing-function: ease-in-out you might assume that the start of your animation would ease in, and the end of your animation would ease out. html { --color: orange; } p { color: var(--color); } It is incredibly powerful when combined with calc (). For now, just know that if no timing functions are applied to an animation, all of the keyframes will default to an ease timing function, creating momentary pauses between one keyframe easing out and the next easing in. The first parameter specifies the number of intervals in the function. Other types of animation can also add bloat. " GitHub is where people build software. Lesson Video. Hover over any CSS easing function to get a preview of the animation, comparing it to a linear easing (default). If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the. Easing Cheat Sheet for jQuery, CSS, SCSS. Iteration count specifies the number of times an animation cycle should be played. Beta test for short survey in banner ad slots starting on the. The animation shorthand CSS property applies an animation between styles. Per-property Easing. Keep in mind, you should always use CSS to do something instead of javascript if at any way possible. js 3 GreenSock (GSAP) Animating Tutorial. Transition timing functions control how quickly your animation is playing at various points in the duration. The solution, which may appear odd at first, is to create a keyframed animation with our own easing function dynamically and inject it into the page for use by the menu. 6s ; } Edit on cubic-bezier. Value DefinitionsIn CSS animations, easing functions specify the rate of change of a property over time. Because they may be used to smooth the start and finish of interpolation, the easing functions in the cubic-bezier subset of easing functions are commonly referred to as “smooth” easing functions. Here are just a few examples: You can visualize property changes. The <single-transition-timing-function> CSS data type denotes a mathematical function that describes how fast one-dimensional values change during transitions or animations. For example I am using . 動畫轉變的方式。 相較於傳統 script-driven 的動畫技術，CSS animations 有三種好處： 對於不複雜的動畫來說，CSS animation 是好選擇。It is possible to accomplish the same result with CSS, but it will require additional work. Non-linear easing is what gives animations a more natural, life-like feel. easein { animation-timing-function: ease-in; } . 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. The effects helper methods like . About easing. Example of an easing function that produces an ease-in effect. 5 : 1 - in_f((1- t) * 2) * . 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. CSS animations provide more control over the animation process compared to transitions. The Easing module implements common easing functions. In the case of animations, the name for specifying the rate at which properties change is called easing. In the next chapter, we’ll take a closer look at how timing functions work with CSS @keyframes. Then we pass customTransition to the box. css): Caveats: setting: duration, delay Predefined options Animations Anchor placements: Easing functions:. Pavithra Kodmad on Dec 18, 2018. The transform CSS property is commonly transitioned because it is a GPU-accelerated property that results in smoother animation that also consumes less battery. The only way to do an elastic easing in pure CSS is by hard-coding a keyframes animation, like you did. js, and jQuery UI are some of the most well-known JavaScript animation frameworks. #myDIV { animation-timing-function: linear; } Click the property values above to see the result. Specifies a stepping function, with two parameters. CSS Code: #myDIV { animation-timing-function: linear;} Click the property values above to see the result. Provides a cubic bezier curve, equivalent to CSS Transitions'. Los posibles valores son una o varias <timing-function> (en-US). my problem is making the switch from one class to the other. In CSS, you can use a timing function for an animation, however, with the Web Animations API, you can specify a timing function for each keyframe as well as for the entire animation. A function to use to mix between each set of output value. Transitions only involve interpolation, whereas animations may use. #myDIV { animation-timing-function: ease; } Click the property values above to see the result. For example, you may want to animate two CSS properties but use a different easing function for each one. There are six transition-timing-functions in CSS, and they include: linear; ease; ease-in; ease-out; ease-in-out; cubic-bezier()/li> These are also called easing functions. This generated animation path can be represented in an easing graph. The CSS property value is changed gradually, to create an animated effect. A timing function, sometimes called an easing function, allows you to specify the acceleration or deceleration of the animation over the duration of animation. We will explain each of these as well as the function values, steps ( ) and cubic-bezier ( ), below. In this Vue tutorial we learn how to use the Greensock (GSAP) Javascript animation library for easy animations. Check out the section on transforms in our Functions module. Using different combinations of the three above settings, you should be able to integrate any external CSS animation library. The Current State Of Easing In CSS. 5, 1. The animation shorthand CSS property applies an animation between styles. Easing functions may be specified on individual keyframes in a @keyframes rule. Easing lets you change the acceleration and deceleration of an animation transition. This property accepts an easing function which describes how the intermediate values used during a. First, we calculate the height of the <details> element and we apply this height with inline styles on it. step-end: The easing curve for an animation that starts slowly and decelerates. to(dot, {. some-element { transition: 1s linear; }17. This function isn’t exactly an easing function, as there’s no variation from start to finish. Ease The Ease class provides a collection of easing functions for use with TweenJS. The duration of scroll animation (in seconds). A quadratic easing function is created by multiplying a value between 0 and 1 by itself (e. Eleftheria Batsou's Blog. The CSS animations module lets you animate the values of CSS properties, such as background-position and transform, over time by using keyframes. The CSS does not support all easing functions. P0 and P3 are the start and the end of the curve and, in CSS these points are fixed as the coordinates are ratios. Personally I'd recommend this plugin because it doesn't prefix all it's easing functions with easie, but that's just personal preference. CSS properties transition and animation allow you to pick the easing function. ease-inThe animation shorthand CSS property applies an animation between styles. So, if we have, say, a box with a red background that we want to change to a green background when it is hovered, we can reach right for the transition property to move between. A 2 items array, the first value is the number of rows, the second the number of columns. Animations are different. If you’re taking animation seriously as part of the brand on a project, you should define and consistently use easings. I have seen people use trigonometry functions in the animation-delay; in many cases, using a magic number. The <easing-function> CSS data type denotes a mathematical function that describes the rate at which a numerical value changes. An easing function, that accepts and returns a value 0-1. Value DefinitionsElevate Your Web Design with CSS Animations ~ For Beginners to Mid-Level Devs. How to add easing effect on jquery . I use translate3d and transition to make animation in modern browsers which support css3. If your runtime environment does not support ES modules, you'll need a transpiler (Babel is a nice one). However, animations created using the Web Animations API can use both types of easing. It must be a positive integer (greater than 0). block { transition : transform 0. Elle peut être utilisée pour décrire la rapidité selon laquelle les valeurs évoluent durant les animations. The first value that can be parsed as a time is assigned to the transition-duration, and the second value that can be parsed as a time is assigned to transition-delay. Bug 1309468 will address this. , ChatGPT) is banned. Choose Easing Functions. In animation, the term easing refers to the technique animators use to define an object’s motion. 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. 7, the easing function scales the value to produce an output progress of 0. Either an integer representing the animation's duration (in milliseconds), or an object containing one or more of the following: The number of. You can change as many CSS properties you want, as many times as you want. Introduction to the CSS basic box. Updated 2. ; ease-out will start the animation at full speed, then finish slowly. If that property is something like a vertical distance. css . Here’s the box with the easing function turned on: See the Pen Bouncing Box 2 by Brandon Gregory (@pulpexploder) on CodePen. This lets you vary the animation's speed over the course of its duration. block { transition : transform 0. @keyframes rules don't cascade, so animations never derive keyframes from more than one rule set. PI/2)) + b; } but I need some help how to combine the two. For this I created a custom transition function modal that’s going to take the element and parameters and get the existing transform styles of the element and return a css function. GIF by franciscopola via GitHub. Easing controls how an animation progresses over time by manipulating its acceleration. You can use it on the element opacity instead of the display attribute. 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. The x coordinates of P1 and P2 are restricted to the range [0, 1]. Example of an easing function that produces an ease-in effect. The scale starts at 0 (at 0%), ends at 1 (at 100%) and peaks at let's say s (at. This article follows on from the related article on Animation using CSS Transforms and covers the transition-duration, transition-timing-function and other related CSS3 properties which affect the timing of animations. linear { animation-timing-function: linear; }. Step 2: Adding Delays and Repeating Animations. animation-timing-function is never used in Method 2 and Method 3. As we learned earlier, we see that this results in a value that is also between 0 and 1 (e. The process is similar to working with animation software, except that keyframes in CSS are written as percentages for the timeline of animation in the code.