Empty tags get a terminating slash. An empty tag is a tag that doesn't require an end tag. All tags must be lower case. This does not apply to attributes, only tags. You may have noticed that I have quotes around all of the attributes.
Attribute quotes are now mandatory.
Tags may not nest. In HTML, this is an acceptable format. Now the tags must follow a logical begin and end pattern. They must end at the same level as they are started. Once again, note the lower case tags.