handbad.blogg.se - For each javascript syntax

Main thread animations are subject to jank.

Modern browsers perform scrolling on a separate process and therefore deliver scroll events asynchronously.

The classic way to achieve these kinds of effects is to respond to scroll events on the main thread, which leads to two main problems: The images on this page fade-in as they come into view.

With it, for example, elements can fade-in as they come into view. A reading indicator atop a document, driven by scroll.Ī similar type of scroll-driven animation is an animation that is linked to an element's position within its scroll container.

Examples of this are effects such as parallax background images or reading indicators which move as you scroll. This means that as you scroll up or down, the linked animation scrubs forward or backward in direct response.

A scroll-driven animation is linked to the scroll position of a scroll container. Scroll-driven animations are a common UX pattern on the web.