L.5.2.1.1 Height and Width Attributes

Relative

em

Height of the element’s font

ex

Height of the letter “x”

px

Pixels

%

Percentage

Absolute

in

Inches

cm

Centimeters

mm

Millimeters

pt

Points

Absolute

pc

Picas

For example:

style="position:relative;top:1;left:1;width:50;height:50"
style="position:relative;top:1;left:1;width:10%;height:10%"