lib/carto/parser.js
function() {
                    var c = input.charCodeAt(i);
                    if ((c > 57 || c < 45) || c === 47) return;
                    var value = $(/^(-?\d*\.?\d+(?:[eE][-+]?\d+)?)(\%|\w+)?/);
                    if (value) {
                        return new tree.Dimension(value[1], value[2], memo, env.filename);
                    }
                }
function() {
                    var c = input.charCodeAt(i);
                    if ((c > 57 || c < 45) || c === 47) return;
                    var value = $(/^(-?\d*\.?\d+(?:[eE][-+]?\d+)?)(\%|\w+)?/);
                    if (value) {
                        return new tree.Dimension(value[1], value[2], memo, env.filename);
                    }
                }
function ( ) { var c = input . charCodeAt ( i ) ; if ( ( c > 57 || c < 45 ) || c === 47 ) return ; var value = $ ( / ^(-?\d*\.?\d+(?:[eE][-+]?\d+)?)(\%|\w+)? / ) ; if ( value ) { return new tree . Dimension ( value [ 1 ] , value [ 2 ] , memo , env . filename ) ; } }
A Dimension, that is, a number and a unit. The only unit that has an effect is %
A Dimension that is a number and a unit . The only unit that has an effect is %