what does class=mx-placeholder do?

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I see it in almost ever second line in the DOM, but what does it do?
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1 answers
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so for some clarity I've created a gist.
Here you can see that an empty scrollcontainer creates 4 divs, with total of 11 classes.
just trying to understand what does what :D 

https://gist.github.com/jasonteunissen/41bb43d3ad9fdf6deace98424a4dd76b

 

answered