![]() Pause, Stop, Hide: This guideline applies to animations that are automatic, occur without user action, exist in parallel with other content, and occur for five seconds or more. Below are the animation-related guidelines from the WCAG: There are several guidelines that can provide insight for how to make these considerations, one of them being the Web Content Accessibility Guidelines. In my opinion, there are not many justified use cases to have an animation this dramatic, nonetheless, the web is littered with them, and occasionally these animations can cause some people to become ill, mainly those with vestibular disorders.įor animations that are complex like this, and even for animations that are simple and subtle, it is imperative to consider the reasons that a user may or may not want to interact with the animation. Take a look at the following parallax animation: Every user perceives animations differently, and they may or may not want to engage or see an animation when interacting with a web page. ![]() It is critical to consider accessibility when developing an animation. Therefore, utilizing transform or opacity are great options to animate the page efficiently, and both properties provide a broad range of animation capabilities. Additionally, these layers are calculated on the GPU as opposed to CPU, which is highly optimized to handle changing nodes, such as those that are animated. This means that their lifecycle on the browser will be isolated from other changes that may be occurring, as an effort to optimize the reflows and repaints of a webpage. Browsers are incredibly smart, and when nodes exist on the page that have either of these two properties, these nodes are promoted to their own layers. Luckily, there are two wonderful properties that are isolated to the Composite step: transform and opacity. This is slightly less expensive than animating a Layout property, because we now only retrigger the Paint and Composite steps of the pipeline. If we choose to animate an attribute isolated to the Paint step instead, which is the step that adds pixels to the page, then we trigger a “repaint.” Animating the box-shadow of an element is an example of this. ![]() This is a fairly expensive calculation, and so if we were to choose to animate a property that contributes to the layout of the page, such as the width of an element, this would trigger a “reflow.” Since this is a cascading pipeline, triggering a reflow triggers the Paint and Composite step again as well. The Layout step calculates the geometry and position of everything on the web page. The initial background-color of the button will begin as a lighter blue, and when a user hovers, the transition to a darker blue will occur, as shown below: Exploring this further warrants another blog post entirely. There are a variety of unique transition-timing-functions to play around with, and there has been quite a bit of research into what timing functions are optimal for certain animations. The actual manifestation of the transition, i.e., “how it looks” to the eye. The duration of the animation, starting from user action. The CSS property that will be transitioning from one state to another. The attributes in the above code example are fairly straightforward: Runs from a beginning state to a final state, once through.Ĭan run through multiple states, and can do so infinitely.Ĭan be triggered automatically without user interaction.īelow is a code example of using the CSS transition properties: There are two main properties to use when building CSS animations: transition and animation. I continue to use this website to this day, so they have retained an additional customer, all thanks to a very intentional animation. I immediately concluded that the error was not because the site was unreliable, but because of a one-off issue. Especially as a developer, I recognized the effort they put into making this animation and the genius of adding this element to their generalized error screen, which is often an afterthought or “throw-away” for a site. In that moment, this animation accomplished two main things: it reaffirmed the brand’s friendliness and solidified itself as a reputable site. What a unique feeling to have on an error screen: delight. Now, instead of being annoyed that all the information I entered had seemingly disappeared and I am now stuck on an unintended screen, I actually became re-engaged as I watched this fun train animation.
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