Chapter 69: Subresource Integrity (SRI) & Referrer Policy

Granular Element-Level Referrer Overrides

**Part 14: Security & Best Practices** — Chapter 69: Subresource Integrity (SRI) & Referrer Policy

LEARNING OBJECTIVES ⌵
  • Override document-level Referrer Policy on specific <a>, <area>, <img>, <iframe>, and <script> elements.
  • Use referrerpolicy="no-referrer" on untrusted external outbound links.
  • Configure referrerpolicy="origin" for third-party affiliate and analytics pixels.
  • Protect sensitive user query flows on specific outbound forms (<form referrerpolicy="...">).
🎬 INTERACTIVE VISUAL PIPELINE Core Architecture Simulation
🌐
1. Input
Directives & Tags
⚙️
2. Parse
Tokenizer & AST
🌳
3. Layout
Box Model & Flow
🎨
4. Render
GPU Paint & Composite
PHASE 1: INPUT & DIRECTIVES
Browser receives declarative markup stream, parsing tag tokens and initializing component state.

💻 Interactive Code Playground

SYS: ACTIVE
HULL: 98%
CORE: STABLE
NET: ONLINE
HTML STARSHIP CODE TERMINAL playground.html
root@STARSHIP-ALPHA:~/web-core# READY FOR COMPILATION █
LIVE RENDER & DIAGNOSTICS CORE TEMP: 45°C
INSPECTING DOM: VALID
TAGS: SCANNING...

📌 Key Takeaways

  • The referrerpolicy attribute on individual HTML elements overrides the page-wide <meta name="referrer"> and HTTP header for that specific request.
  • Use referrerpolicy="no-referrer" on outbound links originating from private dashboard routes.
  • --

❓ Knowledge Check

1. Which of the following is correct?

2. Which of the following is correct?