| DOM operations only raise exceptions in "exceptional" circumstances,
i.e., when an operation is impossible to perform (either for logical
reasons, because data is lost, or because the implementation has become
unstable). In general, DOM methods return specific error values in ordinary
processing situations, such as out-of-bound errors when using
NodeList .
Implementations may raise other exceptions under other circumstances.
For example, implementations may raise an implementation-dependent
exception if a null argument is passed.
See also the Document Object Model (DOM) Level 2 Specification.
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