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Tips and pitfalls on migrating from HTML to XHTML from the angle of current browsers.

How to cleanly join the new web

Tips and pitfalls on migrating from HTML to XHTML from the angle of current browsers.

 
Graphs of sunrise/sunset and time of light for any place in the world.

Sunrise and sunset, all year long, anywhere

Graphs of sunrise/sunset and time of light for any place in the world.

 
History, advantages and usage contexts of the PNG image format.

A flexible, optimized and free image format

History, advantages and usage contexts of the PNG image format.