The Digester

A site message asks users to tick a verification box and to contact IOP Publishing with a screenshot if the check cannot be completed.

The message asks visitors to confirm they are human by ticking a box on the webpage.
If verification fails users are directed to https://ioppublishing.org/contacts/ and told to include a screenshot.
Such prompts are a common human verification measure to prevent automated access.
Including a screenshot helps the publisher diagnose and resolve access or display problems.

IOP Publishing asks visitors to confirm they are human before accessing site