Hybrid Overscroll: Root Glow and Inner Bounce in WebView
Blink2866 Des 2025

Hybrid Overscroll: Root Glow and Inner Bounce in WebView

The provided text details the complex mechanisms governing overscroll behavior within the Android WebView and Chromium engine, specifically contrasting how the root content and non-root scrollable elements display boundary feedback. For the root content, WebView intentionally disables Chromium's built-in elastic bounce and instead funnels overscroll events to the Java layer, where the native Android EdgeEffect API draws a standard edge glow unless the app developer explicitly disables it. Conversely, a feature flag called OverscrollEffectOnNonRootScrollers enables an elastic, rubber-band bounce effect for inner scrollable components, which is achieved entirely via compositor transforms handled by the ElasticOverscrollController and InputHandlerProxy within Chromium, ensuring the root glow and inner bounce can coexist without conflict. This design establishes a hybrid overscroll model that preserves the expected Android look for the main view while providing advanced web functionality for internal scrollers.


Episoder(395)

Chromium Blink: Scroll-Triggered Animations on the Compositor Thread

Chromium Blink: Scroll-Triggered Animations on the Compositor Thread

This document explores the technical implementation of scroll-triggered animations within Chromium's Blink engine and compositor. Unlike traditional scroll-driven effects that track movement continuou...

6 Feb 31min

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The provided text outlines the evolution and technical implementation of the CSS clip-path property, which allows developers to create non-rectangular regions for web content. It details how the stand...

6 Feb 36min

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The LocalFrameView class serves as the primary engine for managing a document's visual viewport and orchestrating its rendering pipeline within the Blink engine. It functions as a critical bridge betw...

5 Feb 40min

Chromium View Transitions: A Complete Implementation Deep-Dive

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This technical documentation explains how Chromium implements View Transitions by coordinating four distinct architectural layers: Blink, the cc compositor, the Viz service, and CSS animations. It det...

5 Feb 32min

CSS Scroll-Margin: Specification and Implementation in Blink

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The provided text explains the CSS scroll-margin property, a tool within the Scroll Snap module that establishes additional space around an element when it is scrolled into view. While it functions si...

5 Feb 31min

Modern CSS Carousels: Engineering Performance and Accessibility

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This text explores the technical evolution of CSS carousels, which allow developers to create interactive slideshows using web standards rather than heavy scripting. It details various implementation ...

5 Feb 33min

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