7. Glossary

7.1 Imperatives

may: The implementation is not obliged to follow this in any way.
must: If this is not followed, the implementation does not conform to this specification.
shall: If this is not followed, the implementation does not conform to this specification.
should: If this is not followed, though the implementation officially conforms to the specification, undesirable results may occur in practice.
typical: Typical rendering is described for many elements. This is not a mandatory part of the specification but is given as guidance for designers and to help explain the uses for which the elements were intended.

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