First thank you for your reply which is funny and at the same time very fair.
I also want to learn and participate. But I have little knowledge in this area to share for now.
I was thinking of Html / Css possibly Js ..
Here is approximately the principle:
in Left : parent block (fixed but interactive).
In right : child block (fixed but interactive).
– When I click in the parent block on the colored area, The corresponding part (child 1, 2 or 3) is displayed above the child block.
Here are the svg code of juxtaposable pictures :