Web design tips for KompoZer users: Lessons, tutorials and web design tips

Learning HTML and CSS

Web Design Group Web Authoring FAQ: a complete, updated and really helpful web authoring FAQ. This FAQ is the mature result of dozens of expert contributors and years of experience in the area of web authoring. This FAQ page should be your first website to visit whenever you have a web authoring question.
HTML Dog by Patrick Griffiths. Excellent HTML and CSS Tutorials, References, Articles
CSS: Getting Started A complete tutorial in 14 parts at Mozilla Developement Center
4 excellent CSS tutorials from Web Design Group
CSS Recommendations, best CSS practices and 12 very valuable CSS tips for more advanced users
Tutoriels pour apprendre les standards Web, HTML, CSS, PHP de Alsacreations

Daniel Tobias' website design tips 30 excellent articles on webpage authoring with lots of tested and proven webpage design tips
Quality Assurance tips: Quality Tips for Webmasters from the W3C: 17 tips that will indisputably improve your website. Also other available translated versions of these tips:
- Dicas de garantia de qualidade para Webmasters (en Português Brasileiro)
Truth & Consequences of web site design by Chris Beal. 14 well written articles on very frequently encountered mistakes on web design and how to correct them. I highly recommend these articles to beginners.

KazGarden CSS webpage templates is the result of the efforts of several KompoZer users to create accessible, web standards compliant, valid CSS webpage templates.
Simple 2 column CSS layout with tutorial on how to create templates Excellent resource from Roger Johansson! Learn how to make a CSS template (which can better meet your personalized needs) not just using a prefabricated one.

HTML 4.01 Technical specification translations available in several other languages
CSS 2.2 Technical specification translations available in several other languages

markup validator
WDG markup validator with several other HTML validation service (batch mode, direct entry, etc)
CSS validator translations available in 20 other languages
Validateur HTML du W3Québec fait par Yan Morin, hébergé par ProgYSM, en Français!
HTML Validator S.A.C. (Stand Alone Complex) for Mac OS X
Install W3C Markup Validator in Kubuntu 22.04 LTS
HTML Validator (based on OpenSP, just like W3C validator) and HTML Tidy for Firefox and Seamonkey by Marc Gueury. A true HTML (SGML) validator along with W3C HTML Tidy (linter)! Ideal for offline usage. No upload to do. No extra application to load and run. Just wonderful!
Latest version is 0.9.9.5
news:comp.infosystems.www.authoring.html: A discussion newsgroup where you can submit your questions if/when you do not know how to fix validation errors or if/when you do not understand the validator error messages.