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The core test importNode07 creates an element using the level 1 createElement method. It then imports the node into another document and later checks the localName value of the imported element. Since the element was created as a level 1 element (and hence has a localName of NULL) when it is duplicated by the importNode operation it will receive a NULL value for it's localName attribute. This causes the test to fail because it is looking for the imported element to have a non-NULL localName value.
Modified test to use level 2 method "createElementNS" instead of createElement from level 1.