1. This is HTML rather than XHTML.

3. When you write XHTML, please use the 4 lines that I reference in week #1.

4. The address to validate is available here as well.

8. This shows the use of the validator.

10. text is not in a container.

11. in a container.

12. These examples are available at my website under HTML.

23. Note that if you do both bold and italics you need to close the inner (in this case italics) before you close the outer.

26. This was written in XHTML style but it is using the old way to do an outline and will not validate.

28. Again written as XHTML, but using the HTML way of handling bullets and will not validate.
Note my mistake, this should have been <ul type-"square">.