cc::ScrollTree
Blink2862 Marras 2025

cc::ScrollTree

The source text provides an exhaustive technical overview of the Scroll Property Tree (cc::ScrollTree) within the Chromium compositor architecture, which is critical for enabling smooth, off-main-thread scrolling. It explains that the ScrollTree captures the hierarchy and properties of scrollable elements, utilizing individual ScrollNodes to store geometric data (like content and container bounds) and behavioral flags (such as whether scrolling is handled on the main thread or if scroll snapping is active). Furthermore, the text details how the ScrollTree works in close coordination with the Transform Tree to apply scroll-induced translations and how it manages the entire scrolling lifecycle, from input event hit-testing and scroll latching to handling overscroll and synchronizing scroll offsets back to the main thread (Blink) via commit mechanisms. This system ensures that complex features like pinch-zoom, sticky positioning, and scroll-linked animations operate correctly and efficiently on the compositor thread.

Jaksot(397)

Containing Blocks in CSS and Blink Layout

Containing Blocks in CSS and Blink Layout

The source provides a highly technical, in-depth analysis of the concept of containing blocks in CSS layout, explaining how these invisible boundaries determine the sizing and positioning of elements,...

13 Marras 202554min

Chromium Compositor Scroll and Gesture Event Handling

Chromium Compositor Scroll and Gesture Event Handling

The source text explains how Chromium handles gesture and scroll events within its input pipeline, particularly focusing on the interaction between the Blink/UI thread and the compositor thread. It de...

12 Marras 202536min

Chrome Finch Field Trial Configuration Deep Dive

Chrome Finch Field Trial Configuration Deep Dive

The source provides an extensive explanation of Chrome Finch Field Trials, which is the framework Chrome uses for running experiments and feature rollouts without requiring a full browser update. Spec...

11 Marras 202541min

Advanced Scrolling Scenarios – Fixed Elements, Sticky Positioning, and Lifecycle Coordination

Advanced Scrolling Scenarios – Fixed Elements, Sticky Positioning, and Lifecycle Coordination

The source provides an extensive technical explanation of how the Chrome rendering engine, Blink, and its Compositor implement advanced CSS scrolling features like position: fixed and position: sticky...

11 Marras 202551min

Chrome Compositor Tiling, Raster, and Scroll Optimization

Chrome Compositor Tiling, Raster, and Scroll Optimization

The source provides an extensive explanation of the Chrome Compositor's tiled rendering architecture, detailing how it achieves smooth scrolling and efficient visual updates. It outlines the process o...

11 Marras 202559min

LCD Text Rendering – Algorithm, Heuristics & Scroll Raster Impacts

LCD Text Rendering – Algorithm, Heuristics & Scroll Raster Impacts

The source text provides an extensive technical overview of LCD text rendering (subpixel antialiasing) within the Google Chrome browser's architecture, involving the Blink rendering engine and the Ski...

11 Marras 202542min

Compositor-Thread Scrolling – CC Mechanics and Property Trees

Compositor-Thread Scrolling – CC Mechanics and Property Trees

The source provides an extensive technical overview of Chrome’s Compositor-Thread Scrolling architecture, explaining how modern web rendering achieves smooth, low-latency scrolling by handling most sc...

11 Marras 202545min

Blink Main-Thread Scrolling – DOM, Layout, and Lifecycle

Blink Main-Thread Scrolling – DOM, Layout, and Lifecycle

The source provides an extensive technical overview of how the Blink rendering engine handles scrolling, particularly focusing on the main-thread scrolling lifecycle. It explains that while modern bro...

10 Marras 202545min