Three Ways to Validate
1. Validate by URI
Explanation
- If an external style sheet is online, you may validate it by entering its uri (url).
You may also validate a complete web-page with all of its styles if it is online — yes, all levels of its cascading styles — by entering its uri (url).
Yes, this is the way to check all of the CSS for a web-page:
- any or all of its external style sheets;
- any or all of its document level styles;
- any or all of its inline styles;
- yes, everything at once — if the page is online.
Notice: Your XHTML must be valid first. If it isn't, then you will receive a message telling you to validate your XHTML.