thanks again for that help - i do struggle still - i tried to rebuild that website to check if I'm able to build the effect into the H1 headline
the block ID is #block-yui_3_17_2_1_1701943410249_5303 and I modified the JS code. what am I missing / doing wrong? i did try code injection in the footer and header, too.
https://blueberry-pike-54k4.squarespace.com/
i also tried to use instead of the block-yui the collection #collection-657198b61aad8f749e2925bb like you did in your example. then the font appears first very small and then bigger but without the effect.