Introduces a new API for content to dictate how a scroll delta isĪpplied and consumed. To map scroll position to time and use that as a timeline for theĪllows JavaScript to be run on the compositor thread in smallĬhunks, provided it doesn’t cause the framerate to drop. The proposals currently underįor precisely controlling web animations in JavaScript, with an Currently thereĪre a few proposals for APIs that would allow such effects, and they all Kinds of scroll-linked effects you are trying to implement, so that weĬan find good ways to support them in the compositor. In order to do so, we need you (yes, you!) to tell us more about the Going forward, we would like to support more effects in the compositor. Post for some more examples of effects that can be implemented using CSS Pages that use scrolling effects without listening for scrollĮvents in JavaScript will not get this warning. Version 46) if it detects the presence of a scroll-linked effect on a In all cases, however,įirefox will display a warning to the developer console (starting in However, in some cases the currentĪPIs offered by the browser do not allow this. In many cases, scroll-linked effects can be reimplemented using CSS and Slow-running Javascript on the browser’s main thread. This version can work smoothly in the browser even if there is “toolbar” div will stick to the top of the screen as you scroll down.
Here is an implementation of a sticky-positioning effect, where the Janky, or jittery - in short, something we want to avoid.īelow are a couple of examples of effects that would not work well withĪsynchronous scrolling, along with equivalent versions that would work That the effects implemented will lag a little bit behind what the user The compositor thread and is visible to the user before the scrollĮvent is updated in the DOM and fired on the main thread. In theĪsynchronous scrolling model, the visual scroll position is updated in Support some sort of asynchronous scrolling in order to provide aĬonsistent 60 frames per second experience to the user. Synchronously on the browser’s main thread. These effects work well in browsers where the scrolling is done Property.) You can find a sampling of such effects at CSS Scroll API: The top, right, bottom, and left properties determine the final location of positioned elements.”) (( “The position CSS property sets how an element is positioned in a document. Often scrolling effects are implemented by listening for the scrollĮvent and then updating elements on the page in some way (usually the Their effect on performance, related tools, and possible mitigation This article discusses scroll-linked effects, Webpage where something changes based on the scroll position, forĮxample updating a positioning property with the aim of producing a The definition of a scroll-linked effect is an effect implemented on a Turning on Firefox tests for a new configuration.Getting Set Up To Work On The Firefox Codebase.
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