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HTML 

              
                <!-- THE CHALLENGE: -->
<!-- 1. recreate version 3 (https://codepen.io/cjl750/pen/mXbMyo) with no javascript whatsoever
     2. make code as abstract as possible (e.g., trying to calc positions that would work with any number of dots instead of hard-coding the container width as we do in our media queries)
     3. highest browser support possible -->
<!-- Bonus points: turn v3's pseudo content into actual element content, so it's accessible to screen readers, search engines, etc. -->

<h1>Notable inventions, <span>1910–2000</span></h1>
<div class="flex-parent">
	<div class="input-flex-container">
		<input type="radio" name="timeline-dot" data-description="1910">
		<div class="dot-info" data-description="1910">
			<span class="year">1910</span>
			<span class="label">headset</span>
		</div>
		<input type="radio" name="timeline-dot" data-description="1920">
		<div class="dot-info" data-description="1920">
			<span class="year">1920</span>
			<span class="label">jungle gym</span>
		</div>
		<input type="radio" name="timeline-dot" data-description="1930" checked>
		<div class="dot-info" data-description="1930">
			<span class="year">1930</span>
			<span class="label">chocolate chip cookie</span>
		</div>
		<input type="radio" name="timeline-dot" data-description="1940">
		<div class="dot-info" data-description="1940">
			<span class="year">1940</span>
			<span class="label">Jeep</span>
		</div>
		<input type="radio" name="timeline-dot" data-description="1950">
		<div class="dot-info" data-description="1950">
			<span class="year">1950</span>
			<span class="label">leaf blower</span>
		</div>
		<input type="radio" name="timeline-dot" data-description="1960">
		<div class="dot-info" data-description="1960">
			<span class="year">1960</span>
			<span class="label">magnetic stripe card</span>
		</div>
		<input type="radio" name="timeline-dot" data-description="1970">
		<div class="dot-info" data-description="1970">
			<span class="year">1970</span>
			<span class="label">wireless LAN</span>
		</div>
		<input type="radio" name="timeline-dot" data-description="1980">
		<div class="dot-info" data-description="1980">
			<span class="year">1980</span>
			<span class="label">flash memory</span>
		</div>
		<input type="radio" name="timeline-dot" data-description="1990">
		<div class="dot-info" data-description="1990">
			<span class="year">1990</span>
			<span class="label">World Wide Web</span>
		</div>
		<input type="radio" name="timeline-dot" data-description="2000">
		<div class="dot-info" data-description="2000">
			<span class="year">2000</span>
			<span class="label">Google AdWords</span>
		</div>
		<div id="timeline-descriptions-wrapper">
			<p data-description="1910">And future Call of Duty players would thank them.</p>
			<p data-description="1920">Because every kid should get to be Tarzan for a day.</p>
			<p data-description="1930">And the world rejoiced.</p>
			<p data-description="1940">Because building roads is inconvenient.</p>
			<p data-description="1950">Ain’t nobody got time to rake.</p>
			<p data-description="1960">Because paper currency is for noobs.</p>
			<p data-description="1970">Nobody likes cords. Nobody.</p>
			<p data-description="1980">Brighter than glow memory.</p>
			<p data-description="1990">To capitalize on an as-yet nascent market for cat photos.</p>
			<p data-description="2000">Because organic search rankings take work.</p>
		</div>
	</div>
</div>


<div style="position: absolute; bottom: 15px; right: 10px; font-size: 12px">
	<a href="https://codepen.io/cjl750/pen/mXbMyo" target="_blank">based off of version 3</a></div>
!

CSS 

              
                $numDots: 20
$parentWidthBase: 0.8
$parentWidth: $parentWidthBase * 100vw
$parentMaxWidth: 1000px
$dotWidth: 25px
$active: #2C3E50
$inactive: #AEB6BF

html
	height: 100%
body
	min-height: 100%
body
	font-family: 'Quicksand', sans-serif
	font-weight: 500
	color: #424949
	background-color: #ECF0F1
	padding: 0 25px
	display: flex
	flex-direction: column
	position: relative
h1
	text-align: center
	height: 38px
	margin: 60px 0
	span
		white-space: nowrap
.flex-parent
	display: flex
	flex-direction: column
	justify-content: center
	align-items: center
	width: 100%
	height: 100%
	min-height: 500px
.input-flex-container
	display: flex
	justify-content: space-around
	align-items: center
	flex-wrap: wrap
	width: $parentWidth
	max-width: $parentMaxWidth
	position: relative
	z-index: 0
	margin-left: calc((#{$parentWidth} - #{$dotWidth}) / #{$numDots}) //make up for offset of .dot-info
input
	width: $dotWidth
	height: $dotWidth
	background-color: $active
	position: relative
	border-radius: 50%
	display: block
	-moz-appearance: none
	-webkit-appearance: none
	appearance: none
	cursor: pointer
	&:focus
		outline: none
	&::before, &::after
		content: ''
		display: block
		position: absolute
		z-index: -1
		top: 50%
		transform: translateY(-50%)
		background-color: $active
		width: $parentWidth / $numDots
		height: 5px
		max-width: $parentMaxWidth / $numDots
	&::before
		left: calc(#{-$parentWidth / $numDots} + #{$dotWidth / 2})
	&::after
		right: calc(#{-$parentWidth / $numDots} + #{$dotWidth / 2})
	&:checked
		background-color: $active
		&::before
			background-color: $active
		&::after
			background-color: $inactive
	&:checked
		~ input
			&, &::before, &::after
				background-color: $inactive
		+ .dot-info
			span
				font-size: 13px
				font-weight: bold	

.dot-info
	width: $dotWidth
	height: $dotWidth
	display: block
	// background-color: red
	visibility: hidden
	position: relative
	z-index: -1
	//position each span on top of the dot immediately before it; -1px at the end is just fudging the numbers for rounding error
	left: calc((((#{$parentWidth} - #{$dotWidth}) / #{$numDots}) * -1) - 1px)
	span
		visibility: visible
		position: absolute
		font-size: 12px
		&.year
			bottom: -30px
			left: 50%
			transform: translateX(-50%)
		&.label
			top: -65px
			left: 0
			transform: rotateZ(-45deg)
			width: 70px
			text-indent: -10px

#timeline-descriptions-wrapper
	width: 100%
	margin-top: 140px
	font-size: 22px
	font-weight: 400
	margin-left: calc((-#{$parentWidth} - #{$dotWidth}) / #{$numDots}) //make up for offset of .dot-info
	p
		margin-top: 0
		display: none


// magic shenanigans
$descriptions: '1910', '1920', '1930', '1940', '1950', '1960', '1970', '1980', '1990', '2000'

@each $desc in $descriptions
	input[data-description="#{$desc}"]:checked ~ #timeline-descriptions-wrapper
		p[data-description="#{$desc}"]
			display: block




@media (min-width: $parentMaxWidth / $parentWidthBase)
	.input-flex-container
		margin-left: #{($parentMaxWidth / $numDots) + ($dotWidth / 2)}
	input
		&::before
			left: #{-($parentMaxWidth / $numDots) + ($dotWidth / 2)}
		&::after
			right: #{-($parentMaxWidth / $numDots) + ($dotWidth / 2)}
	.dot-info
		left: calc((((#{$parentMaxWidth} - #{$dotWidth}) / #{$numDots}) * -1) - 1px)
	#timeline-descriptions-wrapper
		margin-left: #{-($parentMaxWidth / $numDots) + ($dotWidth / 2)}
	

@media (max-width: 630px)
	.flex-parent
		justify-content: initial
	.input-flex-container
		flex-wrap: wrap
		justify-content: center
		width: 400px
		height: auto
		margin-top: 15vh
		margin-left: 0
		padding-bottom: 30px
	input, .dot-info
		width: 60px
		height: 60px
		margin: 0 10px 50px
	input
		background-color: transparent !important
		z-index: 1
		&::before, &::after
			content: none
		&:checked
			+ .dot-info
				background-color: $active
				span
					&.year
						font-size: 14px
					&.label
						font-size: 12px
	.dot-info
		visibility: visible
		border-radius: 50%
		z-index: 0 // position behind input, so input remains clickable
		left: 0
		margin-left: -70px
		background-color: $inactive
		span
			&.year
				top: 0
				left: 0
				transform: none
				width: 100%
				height: 100%
				display: flex
				justify-content: center
				align-items: center
				color: #ECF0F1
			&.label
				top: calc(100% + 5px)
				left: 50%
				transform: translateX(-50%)
				text-indent: 0
				text-align: center
	#timeline-descriptions-wrapper
		margin-top: 30px
		margin-left: 0
		text-align: center

@media (max-width: 480px)
	.input-flex-container
		width: 340px

@media (max-width: 400px)
	.input-flex-container
		width: 300px
!

JS
!
999px

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