WC3 Viewer

WC3 Viewer is a quick in-browser tool to render and validate HTML, SVG, XML, and CSS documents from URL or content.

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1,396+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

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About This Tool

WC3 Viewer renders web documents in accordance with W3C standards and provides in-browser validation feedback without server-side processing.
It accepts a URL or inline content and can infer or accept document_type (HTML, SVG, XML, CSS). A rendered representation and a structured validation report are produced.
Developers, QA teams, educators, and students benefit from quick checks during coding, testing, and teaching sessions. The tool emphasizes privacy by not requiring code edits to see results.
Key differentiators include in-browser validation against core standards, support for multiple document types, exportable snapshots and reports, and deterministic error data such as line/column and severity.

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How to Use

Provide inputs: enter a document URL or paste content.
If needed, select document_type (HTML, SVG, XML, CSS) or enable auto-detect.
Initiate rendering and validation to generate a preview and report.
Review errors, warnings, and suggested fixes in the report.
Export a snapshot or report if needed.

Frequently Asked Questions

Find Quick Answers

What document types are supported?

WC3 Viewer supports HTML5, SVG 1.1, XML well-formed documents, and CSS. It can fetch documents over HTTP/HTTPS or load inline content. The in-browser parsers ensure compatibility with common web standards and allow rapid cross-checks during development.

How are validation results presented?

The validation report lists errors and warnings with location data (line/column), severity, and concise guidance. It supports filtering by type (syntax, conformance, accessibility-related checks) and can export results as JSON or text for documentation.

Is user data processed server-side?

No server-side rendering is required; processing occurs in the client browser. Remote fetches obey browser security policies and may be subject to CORS. No content is sent to a third party unless the user explicitly exports data.

Can I export outputs?

Yes, export options include the current rendered snapshot and the validation report in JSON or plain text. Snapshots capture the document state, while reports summarize conformance results for QA records and educational demonstrations.

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