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document.implementation＝ ／[Edge]

＝[object]：[object DOMImplementation]

createDocument＝[function]：function createDocument() { [native code] }

createDocumentType＝[function]：function createDocumentType() { [native code] }

createHTMLDocument＝[function]：function createHTMLDocument() { [native code] }

hasFeature＝[function]：function hasFeature() { [native code] }