These are the results of my code validation:

File Type Name Status Remedy
HTML index.html Failed - 10 Errors - All described as "X attribute on the hr element is obsolete. Use CSS instead." Make format changes though CSS page.
HTML org.htm Passed! None
HTML books.html Passed! None
CSS lmw92.css Failed - 1 Error - "Parse Error Lexical error at line 1, column 3. Encountered: "D" (68), after : ' Resolve the "Parse Error Lexical error."

These are the results of my web accessibility check:

I used Site Valet (version 2.0.4) to check the accessibility of the site.

Here is a snapshot of the results: