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2. W3C Markup Validation Service - Wikipedia

   en.wikipedia.org/wiki/W3C_Markup_Validation_Service

   The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.

3. List of fact-checking websites - Wikipedia

   en.wikipedia.org/wiki/List_of_fact-checking_websites

   Media Bias/Fact Check. An American websites with focus on "political bias" and "factual reporting". [222] [223].Metabunk: A discussion forum setup by Mick West that covers such topics as pseudoscience, UFOs and the paranormal. The website also includes a forum, "Skydentify", where West invites people to send photos and videos of UFOs and ...

4. Validator - Wikipedia

   en.wikipedia.org/wiki/Validator

   A validator is a computer program used to check the validity or syntactical correctness of a fragment of code or document. The term is commonly used in the context of validating HTML, [1] [2] CSS, and XML documents like RSS feeds, though it can be used for any defined format or language.

5. CSS HTML Validator - Wikipedia

   en.wikipedia.org/wiki/CSS_HTML_Validator

   CSS HTML Validator (previously named CSE HTML Validator) is an HTML editor and CSS editor for Microsoft Windows (and Linux and other Unix-like operating systems when used with Wine) that helps web developers create syntactically correct and accessible HTML/HTML5, XHTML, and CSS documents by locating errors, potential problems like browser compatibility issues, and common mistakes.

6. Fix security certificate error messages in Internet Explorer

   help.aol.com/articles/message-the-security...

   Seeing security certificate errors when visiting certain websites? Learn how to remedy this issue in Internet Explorer. AOL APP. News / Email / Weather / Video. GET.

7. Online Certificate Status Protocol - Wikipedia

   en.wikipedia.org/wiki/Online_Certificate_Status...

   OCSP checking creates a privacy concern for some users, since it requires the client to contact a third party (albeit a party trusted by the client software vendor) to confirm certificate validity. OCSP stapling is a way to verify validity without disclosing browsing behavior to the CA. [2]