// https://dom.spec.whatwg.org/#callbackdef-nodefilter
[Exposed=Window]
callback interface NodeFilter {
    // Constants for acceptNode()
    const unsigned short FILTER_ACCEPT = 1;
    const unsigned short FILTER_REJECT = 2;
    const unsigned short FILTER_SKIP = 3;

    // Constants for whatToShow
    const unsigned long SHOW_ALL = 0xFFFFFFFF;
    const unsigned long SHOW_ELEMENT = 0x1;
    const unsigned long SHOW_ATTRIBUTE = 0x2;
    const unsigned long SHOW_TEXT = 0x4;
    const unsigned long SHOW_CDATA_SECTION = 0x8;
    const unsigned long SHOW_ENTITY_REFERENCE = 0x10; // legacy
    const unsigned long SHOW_ENTITY = 0x20; // legacy
    const unsigned long SHOW_PROCESSING_INSTRUCTION = 0x40;
    const unsigned long SHOW_COMMENT = 0x80;
    const unsigned long SHOW_DOCUMENT = 0x100;
    const unsigned long SHOW_DOCUMENT_TYPE = 0x200;
    const unsigned long SHOW_DOCUMENT_FRAGMENT = 0x400;
    const unsigned long SHOW_NOTATION = 0x800; // legacy

    unsigned short acceptNode(Node node);
};
