Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.14)
// Compass (v1.0.0.rc.0)
// ----

@function initial($propertyName) {
  $dataList: (
  	animation-name: none,
  	animation-duration: 0s,
  	animation-timing-function: ease,
  	animation-delay: 0s,
  	animation-iteration-count: 1,
  	animation-direction: normal,
  	animation-fill-mode: none,
  	backface-visibility: visible,
  	background-attachment: scroll,
  	background-clip: border-box,
  	background-color: transparent,
  	background-image: none,
  	background-origin: padding-box,
  	background-position: 0 0,
  	background-repeat: repeat,
  	background-size: auto auto,
  	border-bottom: 0,
  	border-bottom-color: currentColor,
  	border-bottom-left-radius: 0,
  	border-bottom-right-radius: 0,
  	border-bottom-style: none,
  	border-bottom-width: medium,
  	border-collapse: separate,
  	border-color: currentColor,
  	border-image: none,
  	border-left: 0,
  	border-left-color: currentColor,
  	border-left-style: none,
  	border-left-width: medium,
  	border-radius: 0,
  	border-right: 0,
  	border-right-color: currentColor,
  	border-right-style: none,
  	border-right-width: medium,
  	border-style: none,
  	border-spacing: 0,
  	border-top: 0,
  	border-top-color: currentColor,
  	border-top-left-radius: 0,
  	border-top-right-radius: 0,
  	border-top-style: none,
  	border-top-width: medium,
  	border-width: medium,
  	bottom: auto,
  	box-shadow: none,
  	box-sizing: content-box,
  	caption-side: top,
  	clip: auto,
  	clear: none,
  	column-fill: balance,
  	column-count: auto,
  	column-gap: normal,
  	column-rule-color: currentColor,
  	column-rule-style: none,
  	column-rule-width: none,
  	column-span: none,
  	column-width: auto,
  	content: normal,
  	counter-increment: none,
  	counter-reset: none,
  	cursor: auto,
  	direction: itr,
  	display: inline,
  	empty-cells: show,
  	float: none,
  	font-size: medium,
  	font-size-adjust: none,
  	font-style: normal,
  	font-variant: normal,
  	font-weight: normal,
  	height: auto,
  	hyphens: manual,
  	left: auto,
  	letter-spacing:  normal,
  	line-height: normal,
  	list-style-image: none,
  	list-style-position: outside,
  	list-style-type: disc,
  	margin: 0,
  	margin-bottom: 0,
  	margin-left: 0,
  	margin-right: 0,
  	margin-top: 0,
  	max-height: none,
  	max-width: none,
  	min-height: 0,
  	min-width: 0,
  	opacity: 1.0,
  	orphans: 2,
  	outline-color: invert,
  	outline-offset: 0,
  	outline-style: none,
  	outline-width: medium,
  	overflow: visible,
  	overflow-x: visible,
  	overflow-y: visible,
  	padding: 0,
  	padding-bottom: 0,
  	padding-left: 0,
  	padding-right: 0,
  	padding-top: 0,
  	page-break-after: auto,
  	page-break-before: auto,
  	page-break-inside: auto,
  	perspective: none,
  	perspective-origin: 50% 50%,
  	position: static,
  	resize: none,
  	right: auto,
  	table-layout: auto,
  	tab-size: 8,
  	text-align: start,
  	text-align-last: auto,
  	text-decoration-color: currentColor,
  	text-decoration-line: none,
  	text-decoration-style: solid,
  	text-indent:  0,
  	text-overflow: clip,
  	text-rendering:  auto,
  	text-shadow: none,
  	text-transform: none,
  	top: auto,
  	transform: none,
  	transform-origin: 50% 50% 0,
  	transform-style: flat,
  	transition-delay: 0s,
  	transition-duration: 0s,
  	transition-property: all,
  	transition-timing-function: ease,
  	unicode-bidi: normal,
  	vertical-align: baseline,
  	visibility: visible,
  	white-space: normal,
  	widows: 2,
  	width: auto,
  	word-break: normal,
  	word-spacing: normal,
  	word-wrap: normal,
  	z-index: auto,
  	animation: none,
  	background: none,
  	border: none,
  	columns: auto,
  	column-rule: none,
  	font: normal,
  	list-style: none,
  	outline: 0,
  	text-decoration: none,
  	transition: none,
  	color: inherit,
  	font-family: inherit
  );
  @return map-get($dataList, $propertyName);
}

body:before {
  content: initial('z-index');
  content: initial('unko');
}

SassMeister-output.css

body:before {
  content: auto;
}