function canCompress(key) {
					var value = styles[key], i;

					if (!value) {
						return;
					}

					value = value.split(' ');
					i = value.length;
					while (i--) {
						if (value[i] !== value[0]) {
							return false;
						}
					}

					styles[key] = value[0];

					return true;
				}
Checks if the specific style can be compressed in other words if all border-width are equal.