A character string or number specifying the height of the tag
element. Possible values:
An integer between 1 and 20, in which case the height of the element is
relative to the font size of the page.
"full"
, in which case the element's height is a percentage of its
parent's height. The height of the parent element must also be specified.
Percentages do not account for margins or padding and may cause an element
to extend beyond its parent.
"auto"
, in which case the element's height is determined by the browser.
The browser will take into account the height, padding, margins, and border
of the tag element's parent to keep the element from extending beyond its
parent.
"screen"
, in which case the element's height is determined by the height of
the viewport.