Test page for PDF URI IsMap actions

As per Table 210 "Additional entries specific to a URI action" of ISO 32000-2:2020, the URI entry should be set to the full URL of this webpage and the IsMap entry should be set to true.

  /Type /Annot
  /Subtype /Link
  /Rect [0 0 720 523]
  /A << /S /URI /URI (https://safedocs.pdfa.org/uri-ismap-test.html) /IsMap true >>

The location of each click will then get shown on this image (720 x 523 pixels) by processing received URLs of the form "https://safedocs.pdfa.org/uri-ismap-test.html?100,200":

X = x, Y = y

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