External links

The following external links lead to validators that detect programming errors:

• PageSpeed Insights;
• W3C:
  • CSS,
  • Html,
  • Internationalization,
  • Link.

I am gradually fixing the errors that have occurred and checking the validator results regularly. Weak performance test results – for both the portable devices and the desktop – are due to the fact that I deliberately did not use image thumbnails, but only the image files in their original size.