When viewing the page, the table header will float or stay in screen in fixed position), which makes it easier to read when there are a lot of table rows (see image floats.png)
#main-content > div > table > thead.tableFloatingHeaderOriginal
However, on the Edit Contents Window, the table header will not float (see image nofloats.png). When there is a long list/row, users will need to scroll up and down to see/confirm the header of that table.
This feature request is to make the table header floats in Edit Content both in Classic and InPage Mode