Question

In jquery when we do $(elem).height() or .width() then why do we get measurement in pixels
i.e if elem height is set to 200px then we get 200
and if we set elem height to 20% (say it is 200px) then also we get 200

Answer 1

From the jQuery documentation:

The difference between .css(‘height’) and .height() is that the latter returns a unit-less pixel value (for example, 400) while the former returns a value with units intact (for example, 400px).