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(396)

CSS Scroll Snap: Chromium Implementation and Specification

CSS Scroll Snap: Chromium Implementation and Specification

This documentation provides a comprehensive analysis of CSS Scroll Snap, specifically focusing on its technical implementation within Chromium’s Blink engine. It details how Level 1 specifications all...

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Implementing Scroll-Driven Animations in CSS and Blink Architecture

Implementing Scroll-Driven Animations in CSS and Blink Architecture

This text details the development and technical mechanics of CSS scroll-driven animations, a modern web feature that links animation progress to a container's scroll position rather than traditional c...

5 Tammi 42min

Web Scrolling Mechanics: Focus and Viewport Synchronization

Web Scrolling Mechanics: Focus and Viewport Synchronization

Modern web standards and browser engines utilize sophisticated mechanisms to manage how elements are scrolled into view during navigation or script execution. CSS properties like scroll-padding and sc...

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Single-Axis Scroll Containers: Motivation and Implementation

Single-Axis Scroll Containers: Motivation and Implementation

The provided text details a technical implementation in the Blink rendering engine that enables single-axis scroll containers, allowing an element to scroll in one direction while remaining visible or...

3 Tammi 31min

[EXTENDED] Blink and CC Thread: Implementing Position Sticky

[EXTENDED] Blink and CC Thread: Implementing Position Sticky

The provided text describes the technical workflow for managing sticky positioning within the Blink rendering engine and the Chromium compositor. This process begins on the main thread, where the engi...

2 Tammi 42min

Blink and CC Thread: Implementing Position Sticky

Blink and CC Thread: Implementing Position Sticky

The provided text describes the technical workflow for managing sticky positioning within the Blink rendering engine and the Chromium compositor. This process begins on the main thread, where the engi...

2 Tammi 31min

Paint Property Tree Testing: A Deep Dive

Paint Property Tree Testing: A Deep Dive

The provided text explains the PaintPropertyTreeBuilderTest, a C++ unit test suite within the Blink rendering engine of Chromium. This suite is essential for verifying the paint property trees—specifi...

2 Tammi 35min

ScrollingTest: Suite

ScrollingTest: Suite

The ScrollingTest suite is a vital collection of unit tests designed to ensure the Blink rendering engine handles web scrolling with precision and efficiency. It systematically verifies how the browse...

2 Tammi 25min