Selection handles appear on the table.
The width of the adjacent column also changes, so you actually resize two columns. Visual feedback shows you how the columns will adjust; the overall table width does not change.
NOTE: In tables with percentage-based widths (not pixels), if you drag the right border of the rightmost column, the whole table's width changes, and all of the columns grow wider or narrow proportionately.
The width of one column changes. Visual feedback shows you how the columns will adjust; the overall table width changes to accommodate the column you are resizing.
You can specify widths and heights as either pixels or percentages, and you can convert from pixels to percentages and back.