This test only works in WKTR or DRT. Valid system preview Result: Link element present. Identified as system preview. Child 0 is an image inside a system preview. Valid system preview (multiple rel values) Result: Link element present. Identified as system preview. Child 0 is an image inside a system preview. Valid system preview (picture child) Result: Link element present. Identified as system preview. Child 0 is an image inside a system preview. Invalid system preview (wrong rel value) Result: Link element present. Not identified as system preview. Child 0 is not an image inside a system preview. Invalid system preview (wrong children) hello Result: Link element present. Not identified as system preview. Child 0 is not an image inside a system preview. Invalid system preview (too many children) hello Result: Link element present. Not identified as system preview. Child 0 is not an image inside a system preview. Child 1 is not an image inside a system preview. Invalid system preview (no children) Result: Link element present. Not identified as system preview. Invalid system preview (just an image) Result: No link. Child is not an image inside a system preview.