: What is it called when an HTML block floats while scrolling down the content until something else takes its place? Recently updated my blog and was looking for the improvements they have added.

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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:-

I am scrolling down the page in this pic. There are two sections,
First, tells the title of feature update and Second (on the right), is its description.

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.

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