HTML

- Tech and Technology

HTML - Advanced HTML, XML, SAML, SOAP tools. Online web services to check html pages or websites. Tools for webmasters.

HTML Code Convert Online Service. HTML Code Convert is a tool to display html tags like code in web pages.

HTML W3 Schools - Learn about HTML and how to create web pages.

HTML, CSS and Web Design Tools

HTML Validator - Validation Service to verify the html code of some page.
HTML Link Check
Schema Validator
Document Javascript functions Web API

W3 ORG - HTML Specification HTML5 Quick Reference

HTML Goodies - HTML Basics - HTML and XHTML Introduction

HTML Doctor - Checker and validation of web pages. HTML Checker is a Web page analysis tool for use over the World Wide Web or across company intranets behind a firewall

Beginner's Guide to HTML

OWASP Read: A Guide to Building Secure Web Applications

HTML Tips and Hints

Webmaster Reference Guide

HTML Online Laboratory and tests.

Domain Name Server DNS / Bind

HTML META Tags Dictionary

W3C Cascading Style Sheets

HTML5 General Information and Updated References

HTML and language check online systems can verify:
Check the html document and format for spelling errors and provides some suggestions for potentially misspelled words.
Perform an analysis of the images, size, number of colors, and format.
Check the document structure and flag any invalid HTML or CSS syntax or error.
Examine image syntax, missing and recommended elements.
Ability to test different browser support and tags used.
Examine fonts in page to check for cross-platform support.
Verify that all hyperlinks are valid.
Examine div, table structure, form structure and show command hierarchy.
Produce a formatted or squished version of the page.
Check meta tags, keywords, internal links and external links for search engine relevance.
Show cookies and storage set by the page.
Site check to diagnose your entire web site or a subset of pages. Simply provide a top-level URL to receive a site map showing page connectivity and individual HTML Check reports for each page.
Expand internals windows and frameset for further testing.
The user can write custom modules for your own tests.
Ability to test Web pages that are password-protected (HTTP Authentication)
Customizable spelling word lists.
Online documentation.

schema Dataset to include in your website and help to catalog the data used.

schema.org DataCatalog