# 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.

[example.com]Standard Secure HTTPS Link [example.net]Standard Unencrypted HTTP Link

Contact Support (Mailto) Complex Multi-recipient Mailto Call Support (Tel) Usenet News Scheme

Percent-Encoded HTTPS Scheme [%2F%2Fexample.com%2Fencoded-slashes]Percent-Encoded Slashes

[xn--exmple-cua.com]Internationalized Domain (Unicode: exämple.com) [xn--exmple-eua.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

[\\example.com\malware]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.