<p>The Moog company pioneered the commercial
manufacture of modular voltage-controlled
analog synthesizer systems in the early
By default a box is sized just big
enough to hold its contents. To
set your own dimensions for a
box you can use the
The most popular ways to
specify the size of a box are
to use pixels, percentages, or
ems. Traditionally, pixels have
been the most popular method
because they allow designers to
accurately control their size.
When you use percentages,
the size of the box is relative to
the size of the browser window
or, if the box is encased within
another box, it is a percentage of
the size of the containing box.
When you use ems, the size
of the box is based on the size
of text within it. Designers
have recently started to use
percentages and ems more for
measurements as they try to
create designs that are ﬂexible
across devices which have
In the example on the right, you
can see that a containing
element is used which is 300
pixels wide by 300 pixels high.
Inside of this is a paragraph
that is 75% of the width and
height of the containing element.
This means that the size of the
paragraph is 225 pixels wide by
225 pixels high.