Here is an example I found online: codepen.io/nyctophiliac/pen/xpmpyp
Worldwide adoption is 86%, so we may start to use it.
As always, only retarded Microsoft browsers are problematic.
I understand the difference, however in the example the sidebar starts at the top anyway so there is no difference.
Make window smaller and scroll up and down, so you will notice where is the difference.
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