To change the first baseline options
of a selected text frame, choose Object > Text Frame
Options, and click the Baseline Options tab.
- Ascent
-
The height of the “d” character in the font falls below the
top inset of the text frame.
- Cap Height
-
The top of uppercase letters touch the top inset of the text
frame.
- Leading
-
Use the text’s leading value as the distance between the
baseline of the first line of text and the top inset of the frame.
- X Height
-
The height of the “x” character in the font falls below the
top inset of the frame.
- Fixed
-
Specify the distance between the baseline of the first line
of text and the top inset of the frame.
- Min

If you
want to snap the top of the text frame to a grid, choose either
Leading or Fixed so that you can control the location of the first baseline
of text in text frames.