Bug 147053

Summary: Allow scroll customization
Product: WebKit Reporter: Michael Johnston <mj>
Component: Layout and RenderingAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: cigitia, simon.fraser, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: 528+ (Nightly build)   
Hardware: All   
OS: All   

Description Michael Johnston 2015-07-17 14:56:40 PDT 
Scroll events are currently dispatched asynchronously, which makes it impossible to create effects that are bound to the scroll position.

For instance, a common effect used in mobile applications is a sticky image header that zooms in the scrollback extent. Another example is a top or bottom toolbar that tracks in and out with the current scroll position. There are many other subtle effects tied to scroll position that native apps employ, which are impossible to do well on the web today.

Relevant work being discussed in Blink: https://docs.google.com/document/d/1VnvAqeWFG9JFZfgG5evBqrLGDZYRE5w6G5jEDORekPY/edit
Comment 1 Radar WebKit Bug Importer 2015-07-17 16:45:14 PDT 
<rdar://problem/21883758>