[Webkit-unassigned] [Bug 147053] New: Allow scroll customization

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147053

            Bug ID: 147053
           Summary: Allow scroll customization
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mj at flipboard.com

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

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