Considerations for creating a website

Just as there are road standards, for example Rules for Cars (MOT is watching!), there are also for websites.
This is the

World Wide Web Consortium

jurisdiction.

Die W3C-Spezifikationen in deutscher Übersetzung und Kommentierung

As you can see, there are links on  the bottom of this web sites
Valid XHTML and CSS
So you can check the page using the W3C

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