Out Of Curiosity

praise
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I just want to know out of curiosity that what is this in discourse, which is an amazing piece of undisputed software, 2017-01-23_1205

Scroll-bar or parallax or something else?

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The vertical progress bar?

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Yes.[quote=“codinghorror, post:2, topic:56190, full:true”]
The vertical progress bar?
[/quote]

Correct. The Vertical Progress bar.