Current Overscroll System Architecture Deep Dive
Blink28629 Sep 2025

Current Overscroll System Architecture Deep Dive

The provided document offers an in-depth technical architectural overview of the overscroll system, primarily within the Chromium browser. It explains how browsers handle scroll gestures that go beyond content boundaries to produce effects like elastic bounce, pull-to-refresh, and history navigation (overscroll navigation). Central to this system is the OverscrollController, which resides in the browser process and manages gesture state, working in conjunction with an OverscrollControllerDelegate to execute high-level actions such as reloading a page or navigating history. Furthermore, the document details the compositor's role in generating smooth, platform-consistent visual feedback, like the rubber-banding effect, often using off-main-thread animations for performance. Finally, it notes that developers can use the CSS overscroll-behavior property to customize or disable these built-in browser effects.

Episoder(392)

8 View Transition Lifecycle, Debugging, and Failure Handling

8 View Transition Lifecycle, Debugging, and Failure Handling

This lecture excerpt explores the technical lifecycle of the View Transition API in the Blink engine, focusing on how transitions conclude and handle errors. It details how specific JavaScript promise...

27 Jan 30min

7 Blink View Transition Discovery and UA Stylesheet Generation

7 Blink View Transition Discovery and UA Stylesheet Generation

This document details how the Blink rendering engine manages the technical lifecycle of View Transitions by coordinating DOM updates with visual animations. Once a developer triggers a transition, the...

27 Jan 31min

6 Blink and Compositor Handshake in View Transitions

6 Blink and Compositor Handshake in View Transitions

The provided text explains the technical handshake between the Blink rendering engine and the compositor during a web view transition. To ensure visual continuity, the system captures a snapshot of th...

27 Jan 30min

Evolution of CSS: Working Group Drafts and Processes

Evolution of CSS: Working Group Drafts and Processes

The provided text outlines the operations and standardizing procedures of the W3C CSS Working Group, which manages the evolution of web presentation through a modular specification system. It details ...

27 Jan 38min

5 View Transition Mechanics: Pre-paint and Snapshot Coordination

5 View Transition Mechanics: Pre-paint and Snapshot Coordination

The provided text explains how the Blink rendering engine manages view transitions by utilizing a stable coordinate space known as the snapshot root. This mechanism ensures that animations remain cons...

27 Jan 27min

4 Blink View Transition Pseudo-Element Tree and Layout Integration

4 Blink View Transition Pseudo-Element Tree and Layout Integration

The provided text explains how the Blink rendering engine manages View Transitions by generating a temporary pseudo-element subtree to represent page changes. This system acts as an overlay, capturing...

26 Jan 39min

GEM Modern CSS Scroll Positioning and Visibility Specifications

GEM Modern CSS Scroll Positioning and Visibility Specifications

These sources detail the CSS and DOM specifications that govern how elements are positioned and animated when moved into a user's visible area. The documentation introduces scroll-padding and scroll-m...

25 Jan 33min

[GENERAL] Modern CSS Scroll Positioning and Visibility Specifications

[GENERAL] Modern CSS Scroll Positioning and Visibility Specifications

These sources collectively define the technical standards for how web browsers handle scrolling and element visibility. The documentation details the CSSOM View Module's specific algorithm for the scr...

25 Jan 30min

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