CSS calc() function test

Reference: width: 50%;
width: calc( 50% + 40px);
width: calc( max-intrinsic-width() + 40px);
width: calc( self:index * 10% );
width: calc( self:index * 10% );
width: calc( self:index * 10% );
height: calc( intrinsic-height() + 40px );
height: calc( 2px + 25% );