html5-spec-compliance

Validate HTML parsing against the HTML5 specification test suite.

836|66|Updated Feb 3, 2025

Search Tags:#compliance #parsing #html5 #malformed html #spec test suite #recovery rules

Ready to run

npx skills add https://github.com/kreuzberg-dev/html-to-markdown --skill html5-spec-compliance

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Skill: html5-spec-compliance
Source: https://github.com/kreuzberg-dev/html-to-markdown/tree/main/.ai-rulez/domains/html-parsing/skills/html5-spec-compliance
Command: npx skills add https://github.com/kreuzberg-dev/html-to-markdown --skill html5-spec-compliance

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill addresses the challenge of ensuring that HTML parsing adheres strictly to the official HTML5 specification, particularly for handling malformed or non-standard HTML.

Core Features & Use Cases

Spec Compliance Testing: Validates HTML parsing against the HTML5 test suite.
Malformed HTML Handling: Implements HTML5's defined recovery rules for common errors like unclosed tags, missing elements, and mismatched tags.
Entity and Namespace Support: Correctly handles HTML entities and supports namespaces for SVG and MathML.
Use Case: Developers can use this skill to verify that their HTML parser correctly interprets and renders even broken HTML, ensuring consistent behavior across different browsers and tools.

Quick Start

Run the html5-spec-compliance skill to test the parser against the HTML5 specification test suite.

Frequently Asked Questions about html5-spec-compliance

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I validate my HTML parser against the HTML5 specification?▼

To validate HTML5 spec compliance, run your parser against the HTML5 test suite to verify it correctly interprets malformed HTML, applies recovery rules, inserts implicit tags, and manages entities and namespaces.

What are the HTML5 recovery rules for malformed HTML?▼

HTML5 recovery rules define how parsers handle malformed HTML by inserting implicit tags, resolving entities, and correcting unclosed or mismatched tags to ensure consistent rendering across browsers and tools.

How do I handle implicit tag insertion when parsing non-standard HTML?▼

Handling implicit tag insertion requires adhering to HTML5 spec recovery rules, which automatically generate required structural elements when parsing malformed HTML to maintain valid document tree architecture.

Does HTML5 spec compliance testing support SVG and MathML namespaces?▼

HTML5 spec compliance testing includes proper namespace management, ensuring your parser correctly handles SVG and MathML elements alongside standard HTML entities within malformed documents.

Why does my HTML converter break on unclosed tags and missing elements?▼

HTML converters break on unclosed tags when they lack HTML5 spec compliance, failing to apply defined recovery rules for common errors like missing elements and mismatched tags during parsing.

What is the best way to test a custom HTML parser for cross-browser consistency?▼

The best way to test for cross-browser consistency is validating your HTML parser against the official HTML5 specification test suite, ensuring it correctly applies recovery rules and entity resolution for broken HTML.