Document, DocumentType, DocumentFragment, Notation, Entity , and children of Attr nodes are not passed to the filter. The child nodes of an EntityReference node are only passed to the filter if the EntityReference node is skipped by the method LSParserFilter.acceptNode().
When serializing an Element, the element is passed to the filter before any of its attributes are passed to the filter. Namespace declaration attributes, and default attributes (except in the case when " discard-default-content" is set to false), are never passed to the filter.
The result of any attempt to modify a node passed to a LSSerializerFilter is implementation dependent.
DOM applications must not raise exceptions in a filter. The effect of throwing exceptions from a filter is DOM implementation dependent.
For efficiency, a node passed to the filter may not be the same as the one that is actually in the tree. And the actual node (node object identity) may be reused during the process of filtering and serializing a document.
See also the Document Object Model (DOM) Level 3 Load and Save Specification.
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