Web Accessibility Check in C#

Web accessibility checking means evaluating whether an HTML document can be used effectively by people with disabilities and by users who rely on assistive technologies. In C# applications, Aspose.HTML for .NET helps automate this work by validating HTML documents against accessibility rules and returning structured validation results.

Use the Web Accessibility Check section to learn the Aspose.HTML for .NET accessibility workflow: create a validator, choose rules, validate an HTML document, inspect errors and warnings, and save validation results.

Check WCAG Compliance in C#

Accessibility checks are based on rules, guidelines, and success criteria. WCAG defines accessibility requirements under the principles of perceivable, operable, understandable, and robust. Aspose.HTML for .NET exposes these concepts through classes in the Aspose.Html.Accessibility namespace and related result objects.

You can validate a full document or configure validation for specific rules. This is useful when you need to check a complete page, run targeted tests in a build pipeline, review specific criteria such as text alternatives, or collect detailed error information for reporting.

Choose an Accessibility API Workflow

• Accessibility Validator in C# – create an AccessibilityValidator, configure validation with ValidationBuilder, validate HTML documents, and receive a ValidationResult.
• Web Accessibility Rules in C# – work with AccessibilityRules, IRule, Rule, Principle, Guideline, and Criterion objects.
• Validation Results in C# – inspect ValidationResult, RuleValidationResult, and ITechniqueResult after an accessibility check.
• Accessibility Errors and Warnings in C# – collect detailed information about failed criteria, target elements, error descriptions, and warning data.
• Save Accessibility Validation Results – save validation results as text, JSON, or XML for logs, reports, dashboards, or CI workflows.

Typical Validation Workflow

A common accessibility validation workflow includes:

1. Create a WebAccessibility instance.
2. Create an accessibility validator with CreateValidator().
3. Load the source HTML document.
4. Validate the document against all rules or selected criteria.
5. Inspect ValidationResult to determine whether the document passed.
6. Read detailed errors and warnings for failed checks.
7. Save or report validation results when the workflow requires traceable output.

This workflow does not replace manual accessibility testing. It gives developers a repeatable way to detect rule-based issues early, especially in documentation systems, generated HTML, QA checks, and CI pipelines.

Common Accessibility Check Issues

Issue	Why it happens	What to do
The page passes automated checks but still has accessibility problems	Automated tools cannot fully judge meaning, reading order, interaction quality, or user experience	Combine Aspose.HTML validation with manual keyboard and assistive technology testing
Too many errors are reported at once	The validator checks multiple rules and techniques across the document	Start with high-impact issues such as missing labels, missing text alternatives, and contrast problems
A specific WCAG rule must be checked	Full validation may be broader than the current task	Use accessibility rules and criteria to configure targeted validation
Results are hard to review in a team workflow	Console output is useful during development but weak for reporting	Save validation results as text, JSON, or XML and attach them to QA or CI reports

FAQ

Can I check only specific accessibility rules?

Yes. Use the accessibility rules API and validation builder workflow to validate selected rules, guidelines, or criteria instead of checking every available rule.

Can I save accessibility validation results?

Yes. Aspose.HTML for .NET can save validation results in formats such as text, JSON, and XML. Use this when reports must be reviewed, archived, or consumed by another tool.

Does a successful automated check guarantee WCAG compliance?

No. Automated validation is an important part of accessibility testing, but WCAG evaluation also requires manual review, content judgment, keyboard testing, and assistive technology checks.

Related Articles

• Web Accessibility in C# – overview of web accessibility, WCAG concepts, and Aspose.HTML accessibility validation.
• How to Improve Website Accessibility – practical HTML accessibility improvements for content, media, forms, navigation, and keyboard access.
• Screen Reader Accessibility in C# – check alternative text, labels, image buttons, and screen-reader-friendly markup.
• Color Contrast Accessibility in C# – review readable foreground and background color combinations.
• Aspose.HTML for .NET Examples on GitHub – C# examples and project files for Aspose.HTML for .NET.

For a quick visual check outside code, try the free online Color Contrast Checker or Web Accessibility Checker.