Recently updated my blog and was looking for the improvements they have added. I noticed a floating section of text that stayed there until a part of description ended. (Similar to the timestamp on whatsapp messages that you read when you have a long list).
Took some snapshots as I am not certain what this effect is called:-
The marked text "Coding Enhancments", kept floating until the description ended and next title "Even More Widget Updates" took its place
I wish to implement something like that but I am unable to figure what this effect is. Would be grateful if someone can suggest what this effect is called.