The original design of this website is due to Enrique Pardo.

Accessibility statement

This is the official accessibility statement for If you have any questions or comments, feel free to contact me.

Access keys

Most browsers support jumping to specific links by typing keys defined on the web site. Note that the way of typing access keys are different on various browsers and operating systems. For example, on Windows, if you are using internet explorer you can press ALT + an access key, then press RETURN, while if you are using Firefox press ALT + Shift + an access key; on Macintosh, you can press Control + an access key.

All pages on this site define the following access keys:

  • Access key 1 - Home page
  • Access key 2 - Content
  • Access key 3 - Table of contents
  • Access key 9 - Contact information
  • Access key 0 - Accessibility statement

Standards compliance

  1. A close attention was paid to the markup and the structure of all the pages of this site, so that they observe the proposals of the W3C on accessibility. This is always a judgement call; many accessibility features are intentionally vague and can not be tested automatically. We have reviewed all the guidelines and believe that all these pages are in compliance..
  2. All pages on this site validate as XHTML 1.0 Strict. This is not a judgement call; a program can determine with 100% accuracy whether a page is valid XHTML. For example, check the home page for XHTML validity.
  3. All pages on this site use structured semantic markup. h2 tags are used for main titles, h3 tags for subtitles.


  1. Many links have title attributes which describe the link in greater detail, unless the text of the link already fully describes the target (such as the headline of an article).
  2. Links are written to make sense out of context.


  1. All content images used in this site include descriptive alt attributes. Purely decorative graphics include null alt attributes.

Visual design

  1. This site uses cascading style sheets (CSS) for visual layout.
  2. This site uses only relative font sizes, compatible with the user-specified "text size" option in visual browsers.
  3. If your browser or browsing device does not support stylesheets at all, the content of each page is still readable.