I have a table like this:
Header | One | Two | Three
--- | --- | --- | ---
Row | A | B | C
Row 2 | D | E | F
However, the live preview of GFM (online) creates spaces in between each cell as if the cell spacing (or CSS border spacing) value were non-zero. When viewed in Github, the table does not have this space.
(this is in the latest 2.3.0.25835 version)