Re: line spacing in MSIE...NOT!

I wrote:
> ... The font-relative Em and En are

and neglectected to strike "font-relative" before sending the
message. However, 
> horizontal measurements, not vertical.
is correct. In practice, em and en are used to specify horizontal
dimensions, such as paragraph indents.

In current usage, the em is a square of the type size. An em for a
12pt font is 12 points square. Consequently, a line-height of 100%
for a 12pt font will be 12 points from baseline to baseline.

The CSS spec confirms this in section 5.2.6:

The three rules in the example below have the same resultant line
  DIV { line-height: 1.2; font-size: 10pt }     /* number */
  DIV { line-height: 1.2em; font-size: 10pt }   /* length */
  DIV { line-height: 120%; font-size: 10pt }    /* percentage */

In other words:

  1.2 * 10pt = 12pt
  1.2em for a 10pt font = 12pt
  120% of 10pt = 12pt

David Perrell