Demo example of interpolateCSS

Try resizing this window horizontally

Font size of this title changes with respect to window width, at lower width than 768px it starts decreasing slowly, until 260px

Font size of this element is 0.75 times of font size above

Height of this element is equal to font size of element above multiplied by 3

Element with fixed aspect ratio width:height = 1:0.75
No padding hacks are necessary - which results in much simpler code

Different fixed aspect ratio width:height = 1:0.25.
Font size is constant.

Circular element with auto height or width is very easy to create

This element's positioning
is regulated by window width