CSS/HTML Validator

The CSS/HTML Validator is a domain-focused analysis tool that codifies typical front-end validation needs into a deterministic rule engine. It accepts raw HTML, CSS, or combined sources, and returns structured issues with line and column references, severities, and suggested remedies. It helps teams enforce consistency across projects and reduce time spent on manual code review.
Conceptually, validation operates in three stages: parsing, rule evaluation, and reporting. Parsing builds an internal tree of elements and style declarations; rule evaluation applies HTML5 and CSS3 specifications, readability and best-practice constraints; reporting aggregates findings with per-file context, enabling triage and fix prioritization.
Who benefits? Front-end developers who want immediate feedback during coding, QA engineers who verify conformance, and teams integrating pre-commit or CI checks. Unique differentiators include a precise location mapping, a combined HTML/CSS rule set, and optional accessibility checks that complement syntax validation. Core features include per-file reports, severity-based sorting, exportable JSON and human-readable formats, and flexible input modes (paste, file upload, or concatenated blocks). Use cases span editor plugins, CI pipelines, and code reviews, where early detection of defects accelerates delivery and reduces bug-related rework.