XHTML

The powerpoint Ms. Uminga used.
XHTML

XHTML or eXtensible HyperText Markup Language

The following are the rules when it comes to XHTML.

1. PROPER NESTING
2. PROPER CLOSING TAGS
3. ATTRIBUTES IN LOWERCASE CHARACTERS
4. QUOTED VALUES
5. ONE ROOT ELEMENT
6. FORBIDDEN ATTRIBUTE MINIMIZATION
7. IMAGE ALTERNATE TEXTS
8. AMPERSTANDS IN URLS
9. CONTENTS WITHIN BLOCK-LEVEL ELEMENTS

Example for XHTML