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feat(docs): interactive render-blocking demo on Find render-blocking resources #92

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feat(docs): interactive render-blocking demo on Find render-blocking resources #92

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36 changes: 6 additions & 30 deletions pages/Loading/Find-render-blocking-resources.mdx
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import snippet from '../../snippets/Loading/Find-render-blocking-resources.js?raw'
import { Snippet } from '../../components/Snippet'
import { Demo } from '../../components/Demo'

# Find render-blocking resources

Expand All @@ -26,36 +27,11 @@ Render-blocking resources are the primary cause of slow initial page renders. Us

### Render-blocking timeline

```mermaid
sequenceDiagram
participant Browser
participant HTML as HTML Parser
participant CSS as CSS File
participant JS as JavaScript
participant Render as Renderer

Browser->>HTML: Start parsing HTML
HTML->>CSS: Discover <link rel="stylesheet">
Note over HTML: ⏸️ PAUSE parsing
CSS->>CSS: Download CSS
CSS->>CSS: Parse CSS
CSS-->>HTML: CSS ready
Note over HTML: ▶️ RESUME parsing

HTML->>JS: Discover <script> (no defer/async)
Note over HTML: ⏸️ PAUSE parsing
JS->>JS: Download JS
JS->>JS: Execute JS
JS-->>HTML: Script complete
Note over HTML: ▶️ RESUME parsing

HTML->>Render: Parsing complete
Note over Render: ✅ Can start rendering
Render->>Render: Layout + Paint
Render-->>Browser: First Contentful Paint (FCP)

Note over Browser,Render: User sees content
```
<Demo
src="/demos/render-blocking-timeline.html"
title="Interactive timeline comparing how render-blocking resources delay First Contentful Paint against an optimized setup with inlined critical CSS and deferred scripts"
caption="Switch between the render-blocking and optimized setups, then step through to see when the first paint can happen in each."
/>

> **Browser support:** The `renderBlockingStatus` property is currently Chromium-only (Chrome 107+, Edge 107+, Opera 93+). Firefox and Safari don't support this API yet.

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