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: or content; in principle characteristics that cannot be deduced from the document tree. Pseudo-classes may be dynamic, in the sense that an element may acquire or lose a pseudo-class while a user interacts with the document. The exception is ':first-child', which can be deduced from the document tree. Neither pseudo-elements nor pseudo-classes appear in the document source or document tree. Pseudo-classes are allowed anywhere in selectors while pseudo-elements may only appear after the subject of the selector. Pseudo-elements and pseudo-class names are case-insensitive. Some pseudo-classes are mutually exclusive, while others can be applied simultaneously to the same element. In case of conflicting rules, the normal cascading order determines