I did find a link -
However, as someone who has very little knowledge about computer science, I have no idea how to make use of it.
The feature that I am looking for , is almost identical to the cloze deletion feature in Anki.
The feature is useful for testing yourself about specific facts.
Genes NOD2/CARD15 in chromosome
16q12 has got strong association with Crohn‘s disease.
Now, I would like a feature, which hides the words NOD2/CARD15 , and when I click on it (or any other kind of input) it unhides again.
Testing yourself is great for memory retention, opposed to passive reading , so this feature would be great for learning.