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Validation

CSE HTML Validator

Freeware version provides a basic set of reports.

CSSCheck

From the Web Design Group

CSSCheckUp

Checks for CSS1

HTML Tidy

Free open-source utility.

HTML5 Validator

W3C CSS Validation Service

Checks your external CSS documents against the W3C standards.

W3C HTML Validation Service

Checks your HTML against the W3C standards.

W3C Unicorn Validator

Helps to improve the quality of a web page. Gathers results from many services.

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