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Rule-based engines for evaluating syntax trees and document elements against web standards.
Distinct from Validation Rule Engines: Distinct from Validation Rule Engines: focuses specifically on HTML, CSS, and SVG markup conformance rules rather than general field validation.
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The validator repository contains an open-source markup validation engine that checks HTML, CSS, and SVG documents for conformance against official W3C web standards. It operates both as a command-line utility for batch processing local files and remote URLs, and as a standalone web server and HTTP API for browser-based and remote document conformance checking. The software utilizes a rule-based conformance engine and event-driven stream parsing to evaluate document structures, syntax trees, and web accessibility guidelines. It provides URL parsing and normalization utilities that validate i
Validates syntax trees and document elements against formal specifications by matching rules defined for HTML, CSS, and SVG.