W3C: Valid HTML and CSS

W3C validates your HTML page and the CSS applied for the standards.
A valid HTML file has al the tags properly used with their properties and linked to a valid CSS

 

Here is the Valid HTML and CSS page.

You can check for the proof on W3C site by clicking the URLs below.

Valid HTML
Valid CSS

Do you know this?

In windows environment, one can not create a folder named con or prn.
Not even one can save a file with these names.

Naming a folder: con


Naming a folder: prn


Do you know why?