Tests the Discard element with an invalid IRI.
The test is passed if after 1 second 2 green rectangles are displayed
containing the text "PASS".
This test contains 2 sub tests.
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The first sub test checks that only the discard element itself is
discarded when given an invalid IRI. The discard element must not
discard the immediate parent element in this case.
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The second sub test checks that a nested discard element with a valid
IRI discards the xlink:href target and not the immediate parent
element.