FAQ: CSS Display and Positioning - Position: Sticky

This community-built FAQ covers the “Position: Sticky” exercise from the lesson “CSS Display and Positioning”.

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The sticky value is another position value that keeps an element in the document flow as the user scrolls, but sticks to a specified position as the page is scrolled further.

I understand what position: sticky do in css.
But I didn’t understand what is the usage of sticky in real-world websites. Can anyone please demonstrate it with example?
Thanks

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Right here on this blog, on the left you have that sticky page progress. That is a good example.

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This is done by using the sticky value along with the familiar offset properties, as well as one new one.

Anyone know what the new offset property is? I don’t seem to see any new offset properties in the lesson material nor in the examples.

EDIT: It’s the next lesson, the z-index (https://developer.mozilla.org/en-US/docs/Web/CSS/z-index). Maybe should add a note about this fact to this lesson: “…, as well as one new one (z-index) which we will talk about in the next part.”

I was wandering why the <h4>Question 5</h4> element didn’t “stick” at 40px from the top, like all the prevoius questions did. Same class, so they all correspond to the same style in css.