ISBN in source code

[Javier]

I was hoping you guys could help me with this question.

Many times users provide pages on acceptable sites with no ISBN listed, but if I access the source code of some of those pages, the ISBN is there (usually with an sku identifier).

Here is an example (from a publisher site): https://lapollera.cl/libros/hija-ilus...
The ISBN is not shown anywhere but if you access the source code (ctrl+u in my browser -or right click, view source code) and search (ctrl+f) the ISBN 978-956-6087-68-7, it is there. It appears at least four times.

Is it ok to use the image in this case, or is it mandatory for the ISBN to be shown on the page?

[rivka, Former Moderator]

If the ISBN is there in a way anyone (with sufficient tech knowledge can publicly access, i.e. no special access to the webpage) can view, that seems fine to us.

[Javier]

I am glad to learn that we can do that, thanks rivka!

[annob [on hiatus]]

Very good to know, and great question Javier. I hadn't thought of that trick myself but will for sure from now on.

[Sandra]

Amazing work Javier!

Thanks for thinking of it.

[lethe]

Wow, thanks for this, Javier!

[Dobby]

Thanks, Javier and Rivka! This is indeed great information to know. I've seen the scenario as shown in your example so many times.