For my own purposes —making web pages— I have studied the RFCs on HTML and Style-Sheets, and studied & done some exercises on scripting.  The results are:

• HTML & Style  (alleen in het Engels)

  HTML4 & Style Summary Excerpt on (RFC) HTML v4 & Cascading Style Sheets (CSS2). HTML5 & Style Summary Excerpt on (RFCs) HTML v5 & Cascading Style Sheets (CSS3). Characters in HTML All kinds of special characters in HTML. Fonts in HTML Presentation of various fonts. Colors in HTML Presentation of colors in web pages plus a test box. Browser info Information the browser can get at. Test Character Sets Demonstration of the various ISO-8859-n charsets.

  Style demo Demo of some specific styles (autonumbers, list styles, first line, init cap, drop cap). Block style demo Demo & test page for (HTML) block style (e.g. table), borders, fonts, colors, etc. Include file Demo how to load(/include) a file in an HTML-page. Tab menu Demo/exercise on a tab-like menu. Special Character Handling Handling Special Characters in HTML (forms) and PHP/SQL. Converting a MySQL database to UTF8 How to convert an SQL database to UTF-8 (and solve character problems).

   
• Games  (alleen in het Engels, maar je hoeft de taal niet te kennen om toch te kunnen spelen)
  • Tic-Tac-Toc game  (Dutch:  'Boter, Kaas en Eieren', 'Kruisje-Nulletje').
    An exercise in scripting (JavaScript) and Dynamic HTML (DHTML).  Play against the computer;  in 2D you should be able to win occasionally, in 3D I don't give you much of a chance.
  • Sudoku
    This can help you to solve a Sudoku puzzle, or you can play a generated game.
    Game generation for a 13 squares game doesn't work yet.
• Info / Calculations
  • Cursus Internet Browsen (Dutch only)
    Een korte cursus voor beginners in het 'bladeren' op internet.
  • Conditie (Dutch only)
    Berekeningen voor trainingszones via hartslag, Body Mass Index (Quintillex) en (hardloop-)snelheid afhankelijk van de afstand.
  • Date Calculations (Eng.)
    Determine the day on a date, add or subtract dates, calculate interval between dates, determine Easter for a year, generate a calendar.  Plus background and history.
  • Network calculations (Eng.)
    Calculate file transfer or VoIP delay across a packet switched network.  The protocol stack and the network are configurable.
  • Place look-up (Dutch and English)
    Locate places (towns/villages/hamlets/districts) in The Netherlands.
    Vind plaatsen (steden/dorpen/gehuchten/wijken) in Nederland.

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