Blink Compositor Promotion of CSS Animations
Blink2866 Marras 2025

Blink Compositor Promotion of CSS Animations

The technical sources provide an extensive analysis of how the Blink rendering engine (used in Chromium/Chrome) determines whether a CSS animation can be executed on the compositor thread instead of the main thread to improve performance and achieve smooth frame rates. This process involves a complex pipeline, beginning with style calculation and proceeding through layout and layer assignment, where an element must be assigned a composited layer and corresponding property tree nodes to be eligible for acceleration. The critical decision is made by the function CheckCanStartAnimationOnCompositor(), which only permits animations on a limited set of properties—primarily transform, opacity, filter, and backdrop-filter—while rejecting anything affecting layout or requiring frame-by-frame repainting. If accelerated, the animation’s keyframes are converted into CompositorAnimation objects and run by the GPU-assisted compositor, allowing the main thread to remain free for other tasks.

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Inside Blink: The Paint Property Tree Builder Pipeline

Inside Blink: The Paint Property Tree Builder Pipeline

The PaintPropertyTreeBuilder is a critical component within Google Chrome’s Blink engine that converts layout data into structural property trees used for rendering. Operating during the PrePaint phas...

24 Joulu 20251h 4min

Promisify Scroll: Promise-Based Web Scrolling API

Promisify Scroll: Promise-Based Web Scrolling API

The provided text describes a web platform initiative to modernize how browsers handle scrolling by having programmatic scroll methods return JavaScript Promises. Currently, functions like scrollTo() ...

24 Joulu 202528min

CSS Containing Blocks and Blink Engine Implementation

CSS Containing Blocks and Blink Engine Implementation

This text examines how CSS containing blocks function and how the Blink rendering engine implements these rules within Chromium. It explains that a containing block is the essential rectangular refere...

23 Joulu 202526min

Axis-Split Sticky Constraints in Chromium Layout and Compositing

Axis-Split Sticky Constraints in Chromium Layout and Compositing

Chromium is refining its rendering engine to support axis-split sticky constraints, allowing elements to stick to different scroll containers for horizontal and vertical movements. Previously, a singl...

23 Joulu 202533min

Mastering CSS Sticky Positioning and Scroll Containers

Mastering CSS Sticky Positioning and Scroll Containers

This documentation provides a comprehensive analysis of CSS sticky positioning, a hybrid layout scheme that anchors elements within their nearest scroll container while maintaining their space in the ...

20 Joulu 202534min

Blink Paint Property Trees: Construction and Lifecycle Phases

Blink Paint Property Trees: Construction and Lifecycle Phases

The provided text explains the construction and lifecycle of paint property trees within the Blink rendering engine. These structures, which include Transform, Clip, Effect, and Scroll trees, replace ...

20 Joulu 20251h 1min

Chromium's LayerTreeHostClient: The Compositing Bridge

Chromium's LayerTreeHostClient: The Compositing Bridge

The source provides an extensive overview of the LayerTreeHostClient interface, a crucial component in Chromium's rendering architecture that acts as the bridge between the content engine (like Blink ...

18 Joulu 202536min

The Definitive Guide to CSS Scroll Snap

The Definitive Guide to CSS Scroll Snap

The source provides a comprehensive technical deep dive into the CSS Scroll Snap Module Level 1, a feature designed to create precise, controlled, and paginated scrolling experiences, such as carousel...

18 Joulu 202539min