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- All documents must include a DOCTYPE statement
- The root element of the document must be <HTML>.
- Elements and attributes must be lowercase.
- Attribute values must be enclosed in quotation marks and not minimised.
- Leading and trailing spaces in attribute values will be stripped.
- Only the id attribute can be used to identify an element uniquely.
- Non-empty elements must be terminated or have an ending tag.
- Nested elements must be properly nested, not overlapping.
- SCRIPT and STYLE elements must be marked as CDATA areas.
Wow, information overload - let's break it down.
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