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feat: add CSSOM (CSS Object Model) section#2

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SeanPlusPlus wants to merge 8 commits into
krasun:mainfrom
SeanPlusPlus:feat/add-cssom-section
Open

feat: add CSSOM (CSS Object Model) section#2
SeanPlusPlus wants to merge 8 commits into
krasun:mainfrom
SeanPlusPlus:feat/add-cssom-section

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@SeanPlusPlus SeanPlusPlus commented Jan 5, 2026

What

Adds a new section explaining how browsers construct and manage the CSS Object Model (CSSOM), positioned appropriately in the browser rendering pipeline sequence.

Why

The CSSOM is a critical step between CSS parsing and render tree construction. Understanding how browsers convert CSS rules into a structured object model helps developers optimize CSS performance and debug rendering issues.

How

  • Add CSSOM section after CSS parsing but before render tree construction
  • Include minimal interactive example showing CSS rule → CSSOM transformation
  • Cover key concepts: rule specificity, cascade resolution, computed styles
  • Demonstrate how CSSOM APIs work (getComputedStyle, CSSStyleSheet)

Placement in Sequence

Position between existing sections:

  1. HTML parsing → DOM construction
  2. CSS parsing
  3. CSSOM construction ← new section
  4. Render tree construction
  5. Layout/reflow
  6. Paint

Content Outline

  • Brief explanation of CSSOM purpose and structure
  • Visual diagram showing CSS rules → CSSOM tree
  • Interactive demo: modify CSS, observe CSSOM changes

Sean Stephenson added 8 commits January 4, 2026 16:44
- Add CSSOM construction section between HTML parsing and DOM importance
- Include interactive CSS-to-CSSOM parser with specificity calculation
- Demonstrate key concepts: selector parsing, specificity, property resolution
- Position correctly in browser rendering pipeline sequence
Ironic to use text bullets in a CSS demo when we can use actual CSS!
The demo stays - just removed the info box that appeared below it on click
@SeanPlusPlus SeanPlusPlus changed the title Add placeholder CSSOM section component feat: add CSSOM (CSS Object Model) section Jan 5, 2026
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