Fix document fragment support as contextNode #143
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This PR is a fix for #142.
As mentioned in the issue, the problem occurred when using ShadowRoot (document fragment) as the context node with absolute xpath.
Check in PathExpr.applyLocationPath prevent it to fetch the ownerDocument as, in the case of ShadowRoot, it doesn't have acces to the nodes in the document-fragment.
Further in the code, document-fragment were forgotten as node MDN defines document-fragment as nodes.