<!DOCTYPE html>
<html lang="en">
<head>
	<title>Visible vs. Hidden</title>
	<meta name="viewport" content="initial-scale=1">
	<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
     <!-- no space reserved, hidden from aria-->
	<div style="display: none;">
		<h1>Heading</h1>
		<a href="#link1">Link 1</a>
	</div>
    <!-- no space reservced, hidden from aria-->
	<div hidden>
		<h1>Heading</h1>
		<a href="#link2">Link 2</a>
	</div>
    <!-- reserve the space, not hidden from aria-->
	<div style="opacity: 0;">
		<h1>Heading</h1>
		<a href="#link3">Link 3</a><!-- can add tabindex="-1" to hide from tab focus -->
	</div>
    <!-- reserve the space, link is not reachable, similar to display:none; -->
	<div style="visibility: hidden;">
		<h1>Heading</h1>
		<a href="#link4">Link 4</a>
	</div>
   <!-- content is still be renderered to the screen, and link is also reachable -->
	<div class="visuallyhidden">
		<h1>Heading</h1>
		<a href="#link5">Link 5</a>
	</div>
   <!-- render to screen and hidden from aria-->
	<div aria-hidden="true">
		<h1>Heading</h1>
		<a href="#link6">Link 6</a>
	</div>
</body>
</html>
// Code goes here

/* Styles go here */

html, body {
	font-family: Helvetica, sans-serif;
	text-align: center;
}

.visuallyhidden { 
	border: 0;
	clip: rect(0 0 0 0);
	height: 1px;
	margin: -1px;
	overflow: hidden;
	padding: 0;
	position: absolute;
	width: 1px;
}
div {
	color: #fff;
	height: 100px;
	float: left;
	padding-bottom: 2%;
	width: 200px;
}
div:before {
	content: '';
	display: block;
	height: 35%;
}
div:nth-child(1) {
	background-color: purple;
}
div:nth-child(2) {
	background-color: red;
}
div:nth-child(3) {
	background-color: blue;
}
div:nth-child(4) {
	background-color: green;
}
div:nth-child(5) {
	background-color: yellow;
	color: #000;
}
div:nth-child(6) {
	background-color: orange;
	color: #000;
}
div:nth-child(5) a,
div:nth-child(6) a {
	color: #000;
}
div h1 {
	margin: 0;
}
div a {
	color: #fff;
	display: block;
	font-size: 1em;
	font-weight: bold;
	padding: 0.5em;
}
div button, {
	background-color: #000;
	border: 0;
	color: #fff;
	font-size: 1em;
	padding: 0.5em;
}
div button:focus {
	background-color: #fff;
	color: #000;
}