Progi1984

I confirm that solves my problem.

Thanks for your help

Yes I just find the problem.
Before the wp_head function, i use this code
<?php if ( !is_admin() ) wp_deregister_script('jquery'); ?>

Because I use my version of jquery.

So if I deregister jquery script (same if I use my own script), that disables crayon script.

Yep, of course :

https://rootslabs.net/blog/110-wordpress-utiliser-le-lien-read-more-nimporte-ou.

Thanks for your help.