Source/WebCore/xml/XSLTProcessor.idl

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// https://dom.spec.whatwg.org/#xsltprocessor
[
    Conditional=XSLT,
    ImplementationLacksVTable,
    Exposed=Window
] interface XSLTProcessor {
    constructor();

    undefined importStylesheet(Node style);

    // FIXME: In Gecko and the specification, those 2 operations do not return nullable types and instead throw an nsIXSLTException
    // in case of error.
    [CEReactions] DocumentFragment? transformToFragment(Node source, Document output);
    [CEReactions] Document? transformToDocument(Node source);

    // FIXME: Per the specification, value should have type 'any', not 'DOMString'.
    undefined setParameter([LegacyNullToEmptyString] DOMString namespaceURI, DOMString localName, DOMString value);

    // FIXME: Per specification, this should return a type 'any', not 'DOMString?'.
    DOMString? getParameter([LegacyNullToEmptyString] DOMString namespaceURI, DOMString localName);

    undefined removeParameter([LegacyNullToEmptyString] DOMString namespaceURI, DOMString localName);
    undefined clearParameters();

    undefined reset();
};