# Ultimate Email Parser & Link Rewriter Validation Suite v5

Your tree-based parser must strip CSS, destroy forms, block JavaScript, prevent thread freezing, and rewrite whitelisted links accurately.

## 1. Harmless Protocol Rewriting

Your parser should intercept these valid schemes and prepend or rewrite them to your safe redirect sandbox.

Standard Secure HTTPS Link Standard Unencrypted HTTP Link Contact Support (Mailto) Complex Multi-recipient Mailto Call Support (Tel) Usenet News Scheme Percent-Encoded HTTPS Scheme Percent-Encoded Slashes Internationalized Domain (Unicode: exämple.com) Internationalized Domain (Punycode: xn--exmple-eua.com)

## 2. Malicious and Obfuscated Link Bypasses

Your parser must strip or completely neutralize these targets. They should never resolve to a valid sandbox redirect.

Protocol-Relative Anchor Link Mixed Slash Link Target Malicious JavaScript Link Encoded JavaScript Link

## 3. Data-URI and Base64 Obfuscation

Base64 Data Link (Must not execute or pass through)

Data-URI CSS Check

## 4. Advanced Node Map and Attribute Normalization

## 5. Thread Exhaustion: Sibling Proliferation

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## 6. Allowed Content Control Baseline

This bold text, italic text, and underlined text must render exactly as intended with zero active styles.