W3c validating Live camear rom sxs
Also, for the "img" element, width="really wide" is also accepted as valid.DTD-based validators are technically not able to test for these types of attribute value problems.As an alternative you can also try our non-DTD-based validator.
However, it is not a complete measure of web standards conformance.
What the validator validates is the (X)HTML markup, the output of your PHP pages.
If your PHP project is hosted on the net, simply give the URL to the validator.
While the W3C and other HTML and XHTML validators will assess pages coded in those formats, a separate validator like the W3C CSS validator can check that there are no errors in the associated Cascading Style Sheet.
CSS validators apply current CSS standards to referenced CSS documents.