CSE HTML Validator

This HTML validator analyzes input HTML to ensure syntactic correctness and structural validity for pages used in CSE contexts. It tokenizes markup, tracks opening and closing tags, and applies HTML5 rules to detect mismatches, missing DOCTYPE, and malformed attributes. It then aggregates errors and warnings with precise locations to guide developers toward remediation.
Core value lies in deterministic, locale-agnostic validation that scales to large documents without external dependencies. It supports both strict HTML5 conformance and permissive parsing modes for legacy content, and it reports issues relevant to accessibility and search friendliness, such as missing alt text and insufficient landmark usage.
Audience benefits include developers, SEOs, QA engineers, and content teams preparing CSE-ready pages. Unique differentiators are explicit line/column reporting, deterministic results, and a focused rule set aligned with CSE use cases. Typical workflows include pre-publish validation, regression checks after edits, and audit-ready reports for compliance teams.
Core features include: syntax checks, tag balance, attribute validation, DOCTYPE enforcement, and option to trigger advisory checks; outputs include a structured error list, a concise summary, and a human-friendly report.