Cross Site Scripting (XSS)

9.

Prevention and Defense Strategies

9.1.

Input Handling Best Practices

9.1.1.

Input Validation Principles

9.1.1.1.

Allowlist Validation

9.1.1.2.

Data Type Enforcement

9.1.1.3.

Length Restrictions

9.1.1.4.

Format Validation

9.1.2.

Input Sanitization

9.1.2.1.

HTML Tag Removal

9.1.2.2.

Attribute Filtering

9.1.2.3.

Script Content Elimination

9.1.3.

Canonicalization

9.1.3.1.

Unicode Normalization

9.1.3.2.

Path Traversal Prevention

9.1.3.3.

Encoding Standardization

9.2.

Output Encoding Techniques

9.2.1.

Context-Aware Encoding

9.2.1.1.

HTML Entity Encoding

9.2.1.2.

JavaScript String Encoding

9.2.1.3.

CSS Value Encoding

9.2.1.4.

URL Component Encoding

9.2.2.

Encoding Libraries

9.2.2.1.

9.2.2.2.

Framework-Specific Solutions

9.2.2.3.

Custom Implementation Guidelines

9.2.3.

Template Security

9.2.3.1.

Auto-Escaping Features

9.2.3.2.

Safe Template Engines

9.2.3.3.

Context Preservation

9.3.

Content Security Policy

9.3.1.

CSP Directive Configuration

9.3.1.1.

default-src Policy

9.3.1.2.

script-src Restrictions

9.3.1.3.

style-src Controls

9.3.1.4.

img-src Limitations

9.3.1.5.

connect-src Rules

9.3.1.6.

font-src Specifications

9.3.1.7.

object-src Restrictions

9.3.1.8.

frame-src Controls

9.3.2.

Advanced CSP Features

9.3.2.1.

Nonce Implementation

9.3.2.2.

Hash-Based Allowlisting

9.3.2.3.

Strict Dynamic Mode

9.3.2.4.

Unsafe Inline Alternatives

9.3.3.

9.3.3.1.

Report-Only Mode

9.3.3.2.

Violation Reporting

9.3.3.3.

Policy Refinement

9.3.3.4.

Browser Compatibility

9.4.

Secure Development Practices

9.4.1.

Framework Selection

9.4.1.1.

Built-in Security Features

9.4.1.2.

Community Security Record

9.4.1.3.

Update Maintenance

9.4.2.

Code Review Processes

9.4.2.1.

Security-Focused Reviews

9.4.2.2.

Automated Analysis Integration

9.4.2.3.

Peer Review Standards

9.4.3.

Security Testing Integration

9.4.3.1.

Unit Test Security Cases

9.4.3.2.

Integration Test Coverage

9.4.3.3.

Continuous Security Testing

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10. Advanced XSS Concepts