Caution
Some textbooks for HTML use the upper-case letters.
In XHTML however, the distinction is made between upper- and lower-case letters due to the distinction in XML. For instance, <P> would not be the same as <p> in XML. So, <P> will not validate for <p> in XHTML.
| XHTML specs | HTML habits |
|---|---|
| <p> </p> | <P> </P> |
| <ul>
<li> </li> </ul> |
<UL>
<LI> </LI> </UL> |
| <table>
<tr> <td> </td> </tr> </table> |
<TABLE>
<TR> <TD> </TD> </TR> </TABLE> |
| Etc. | |
