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HTML

              
                <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" />

<h1>15 tips to improve web accessibility</h1>

<div id="demo">
  <div id="page">
    <div id="flip">
      <div id="front">
        <div class="link" id="skip-link"></div>
        <div class="image" id="logo"></div>
        <div id="menu"></div>
        <div id="page-title"></div>
        <div class="paragraph" id="paragraph-1"></div>
        <div class="paragraph" id="paragraph-2"></div>
        <div id="page-image"></div>
      </div>
      <div id="back">
        <div class="meta">&lt;!doctype&nbsp;html&gt;</div>
        <div>&lt;html&nbsp;<span class="attr">lang</span><span class="symb">=</span><span class="value">"en"</span>&gt;</div>
        <div>&nbsp;&nbsp;&lt;head&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&lt;title&gt;<span class="text">My&nbsp;Page</span>&lt;/title&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&lt;meta&nbsp;<span class="attr">name</span><span class="symb">=</span><span class="value">"author"</span>&nbsp;<span class="attr">content</span><span class="symb">=</span><span class="value">"Al Montoro"</span>&nbsp;/&gt;</div>
        <div>&nbsp;&nbsp;&lt;/head&gt;</div>
        <div>&nbsp;&nbsp;&lt;body&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&lt;header&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;h1&gt;<span class="text">Page&nbsp;Title</span>&lt;/h1&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;ul&nbsp;<span class="attr">role</span><span class="symb">=</span><span class="value">"navigation"</span>&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;li&gt;&lt;a&nbsp;<span class="attr">href</span><span class="symb">=</span><span class="value">"home.html"</span>&gt;<span class="text">Home</span>&lt;/a&gt;&lt;/li&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;li&gt;&lt;a&nbsp;<span class="attr">href</span><span class="symb">=</span><span class="value">"sec.html"</span>&nbsp;<span class="attr">aria-current</span><span class="symb">=</span><span class="value">"page"</span>&gt;<span class="text">Section</span>&lt;/a&gt;&lt;/li&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;li&gt;&lt;a&nbsp;<span class="attr">href</span><span class="symb">=</span><span class="value">"contact.html"</span>&gt;<span class="text">Contact</span>&lt;/a&gt;&lt;/li&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;/ul&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&lt;/header&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&lt;main&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;section&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;h2&gt;<span class="text">Lorem&nbsp;Ipsum</span>&lt;/h2&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;p&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;img&nbsp;<span class="attr">src</span><span class="symb">=</span><span class="value">"pic.jpg"</span>&nbsp;<span class="attr">alt</span><span class="symb">=</span><span class="value">"Detailed&nbsp;description&nbsp;of&nbsp;picture"</span>/&gt;</div>
        <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="text">Lorem&nbsp;ipsum&nbsp;dolor&nbsp;sit&nbsp;amet</></div>
          <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;/p&gt;</div>
          <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="comment">...</span></div>
          <div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;/section&gt;</div>
          <div>&nbsp;&nbsp;&nbsp;&nbsp;&lt;/main&gt;</div>
          <div>&nbsp;&nbsp;&lt;/body&gt;</div>
          <div>&lt;/html&gt;</div>
        </div>
      </div>
    </div>
  </div>

  <button id="turn-page" tabindex="1">
    <i class="fa fa-undo" aria-hidden="true"></i>
    See more tips
  </button>

  <div id="advices">
    <section class="advice front right" id="advice-logo" tabindex="0">
      <h2>Logo/Site name redirects to home</h2>
      <span>
        Users need easy access to the home page, and the logo is expected to be a link to it.
      </span>
    </section>
    <section class="advice front" id="advice-skip" tabindex="0">
      <h2>Link skips directly to the content</h2>
      <span>
        Make it easy for users to jump the header, menu, etc. and jump to the page main content by adding a skip link.
      </span>
    </section>
    <section class="advice front" id="advice-menu" tabindex="0">
      <h2>Menus should also be usable via keyboard</h2>
      <span>
        A way to control and navigate the menu via keyboard should be available for users that don't use a mouse.
      </span>
    </section>
    <section class="advice front right" id="advice-contrast" tabindex="0">
      <h2>Good color contrast</h2>
      <span>
        The color of the text and elements on the foreground should contrast enough with the color of the background.
      </span>
    </section>
    <section class="advice front" id="advice-font-color" tabindex="0">
      <h2>Text must always<br> be readable</h2>
      <span>
        Pick a font that is easy to read, avoid small font sizes, and adapt the size to fit different screens.
      </span>
    </section>
    <section class="advice front right" id="advice-abbr" tabindex="0">
      <h2>Give meaning to abbreviations</h2>
      <span>
        Screen readers don't recognize   acronyms or abbreviations. Use titles and the abbr tag to add meaning to them.
      </span>
    </section>
    <section class="advice front right" id="advice-form" tabindex="0">
      <h2>Descriptive and<br> easy to use forms</h2>
      <span>
        Use placeholders and labels to describe the fields. Organize fields in order. If there are errors, make it easy to jump and fix them. 
      </span>
    </section>
    <section class="advice front" id="advice-img-type" tabindex="0">
      <h2>The right image for the right place</h2>
      <span>
        Consider type and sizes. Use SVG for vectorial graphics and icons (leverage its accessibility features).
      </span>
    </section>
    <section class="advice back right" id="advice-lang" tabindex="0">
      <h2>Specify the language of document/elements</h2>
      <span>
        It will help with Braille translation software, and with the pronounciation and definitions in screen readers.
      </span>
    </section>
    <section class="advice back" id="advice-meta" tabindex="0">
      <h2>Use metadata and social media tags</h2>
      <span>
        Well-crafted metadata provides orientation to users, screen readers, and external sites.
      </span>
    </section>
    <section class="advice back right" id="advice-links" tabindex="0">
      <h2>Have meaningful<br> and usefull links</h2>
      <span>
        Don't have empty links, or links with just images and no description... or many similar links (e.g. "Read more"). 
      </span>
    </section>
    <section class="advice back" id="advice-aria" tabindex="0">
      <h2>Use ARIA attributes and roles</h2>
      <span>
        They provide useful properties and make the web more accessible for people with disabilities.
      </span>
    </section>
    <section class="advice back right" id="advice-html5" tabindex="0">
      <h2>Use semantic tags</h2>
      <span>
        Not only good for accessibility, but html5 tags improve performance and SEO. 
      </span>
    </section>
    <section class="advice back right" id="advice-struct" tabindex="0">
      <h2>Structure content logically</h2>
      <span>
        Headings and content must be structured in an orderly way. Don't skip headings, have valid HTML. 
      </span>
    </section>
    <section class="advice back" id="advice-img-alt" tabindex="0">
      <h2>Always have <br> alternative text</h2>
      <span>
        First principle of web accessibility... and sometimes easier said than done.
      </span>
    </section>
  </div>
</div>

              
            
!

CSS

              
                html, body {
  background: #ddd;
  font-family: Monaco, "Courier New", Courier, sans-serif;
}

h1 { 
  text-align: center; 
  font-size: 1.5em; 
}

h2 {
  font-size: 1.6vmin;
  margin-top: 0;
  margin-bottom: 0;
}

#page {
  width: 60vmin;
  height: 60vmin;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  perspective: 1000px;
  -webkit-perspective: 1000px;
  z-index: 2;
}

#flip {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  transition: transform 1s;
  transform-style: preserve-3d;
  box-shadow: 1vmin 1vmin 0 rgba(0,0,0,0.1)
}

body.active #flip {
  transform: rotateY(-180deg);
}

#front, #back {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: white;
  backface-visibility: hidden;
  transform: rotateY(0deg);
  overflow: hidden;
}

#front div {
  height: 2vmin;
  background: #ccc;
  position: absolute;
}

#front .link {
  background-color: #3040d0;
}

#front .image {
  background-color: #90aafe;
}

#skip-link {
  top: 2vmin;
  right: 2vmin;
  width: 10vmin;
}

#front #logo {
  top: 2vmin;
  left: 2vmin;
  width: 15vmin;
  height: 5vmin;
}

#front #logo::before {
  content: "LOGO";
  position: absolute;
  top: 50%;
  left: 50%;
  font-size: 2vmin;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  color: rgba(0,0,0,0.6);
}

#front #menu {
  top: 9vmin;
  left: 2vmin;
  width: 56vmin;
  height: 4vmin;
  background: #dd2020;
  z-index: 2;
}

#front #menu::before {
  content:"";
  position: absolute;
  left: 23.4vmin;
  width: 11.2vmin;
  height: 12vmin;
  top: 0;
  background: #aa1010;
}

#front #page-title {
  top: 16vmin;
  left: 2vmin;
  width: 20vmin;
  height: 2vmin;
  background-color: #333;
}

#front .paragraph {
  border-top: 2vmin solid #ccc;
  width: 56vmin;
  left: 2vmin;
  background: white;
}

#front .paragraph::before,
#front .paragraph::after {
  content:"";
  display: block;
  width: 100%;
  border-top: 2vmin solid #ccc;
  border-bottom: 2vmin solid #ccc;
  margin-bottom: 2vmin;
  padding-bottom: 2vmin;
  margin-top: 2vmin;
}

#paragraph-1 {
  top: 20vmin;
}

#front #paragraph-2 {
  top: 43vmin;
  width: 33vmin;
}

#front #paragraph-2::after {
  width: 56vmin;
  border-bottom: 0;
}

#front #page-image {
  top: 43vmin;
  left: 37vmin;
  width: 21vmin;
  height: 10vmin;
  background-color: turquoise;
}

#back {
  background: #191619;
  color: #eee;
  transform: rotateY(180deg);
  font-size: 2vmin;
  box-sizing: border-box;
  padding: 1vmin;
  color: #a7925a;
  font-weight: bold;
  line-height: 2.75vmin;
}

#back > div {
  white-space: nowrap;
}

#back .text, #back .symb {
  color: #e3e3e3;
}

#back .comment {
  color: #999;
}

#back .attr {
  color: #ddca7e;
}

#back .value {
  color: #96b38a;
}

#back .meta {
  color: #9a8297;
}

#turn-page {
  background: rgba(0,0,0,0);
  border: rgba(0,0,0,0);
  cursor: pointer;
  position: absolute;
  left: 50%;
  top: calc(50% + 34vmin);
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  z-index: 1;
  font-size: 1.75vmin;
}

#advices {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  z-index: 3;
}

.advice {
  font-size: 1.6vmin;
  position: absolute;
  width: 20vmin;
  left: 32vmin;
  padding: 1vmin;
}

.advice::before {
  content: "";
  display: inline-block;
  border-top: 1px solid black;
  width: 5vmin;
  height: 0;
  position: absolute;
  top: 2vmin;
  left: 0;
  transform: translate(-100%, 30%);
}

.advice::after {
  content:"";
  display: block;
  width: 1.3vmin;
  height: 1.3vmin;
  background: black;
  border-radius: 100%;
  position: absolute;
  top: 1vmin;
  left: 0;
  transform: translate(-6vmin, 33%);
}

.advice.right {
  left: auto;
  right: 32vmin;
  text-align: right;
}

.advice.right::before {
  left: auto;
  right: 0;
  transform: translate(100%, 30%);
}

.advice.right::after {
  left: auto;
  right: 0;
  transform: translate(6vmin, 33%);
}

body.active .advice::before,
body.active .advice::after {
  border-color: #aa0;
  background-color: #aa0;
}

.advice span { 
  display: none; 
  color: rgba(0,0,0,0.6);
  margin-top: 1vmin;
  font-weight: normal;
}

.advice:hover,
.advice:focus,
.advice:active {
  z-index: 4;
  background: white;
  box-shadow: 1vmin 1vmin 0 rgba(0,0,0,0.1);
}

body.active .advice:hover,
body.active .advice:focus,
body.active .advice:active{
  box-shadow: -1vmin 1vmin 0 rgba(0,0,0,0.1);
}

.advice.back {
  display: none;
}

body.active .advice.front {
  display: none;
}

body.active .advice.back {
  display: block;
}

.advice:hover span,
.advice:focus span,
.advice:active span {
  display: block;
}

#advice-menu {
  top: -21vmin;
}

#advice-skip {
  top: -29vmin;
}

#advice-logo {
  top: -28.5vmin;
}

#advice-img-type {
  top: 15vmin;
}

#advice-font-color {
  top: -3vmin;
}

#advice-lang {
  top: -27vmin;
}

#advice-lang::before {
  width: 2.5vmin;
}

#advice-lang::after {
  transform: translate(3vmin, 33%);
}

#advice-meta {
  top: -19vmin;
}

#advice-img-alt {
  top: 21vmin;
}

#advice-html5 {
  top: 9vmin;
}

#advice-struct {
  top: 16vmin;
}

#advice-links {
  top: -3vmin;
}

#advice-html5::before {
  width: 7vmin;
}

#advice-html5::after {
  transform: translate(8vmin, 33%);
}

#advice-struct::before,
#advice-links::before{
  width: 11vmin;
}

#advice-struct::after,
#advice-links::after{
  transform: translate(12vmin, 33%);
}

#advice-contrast {
  top: -7vmin;
}

#advice-abbr {
  top: 1vmin;
}

#advice-form {
  top: 12vmin;
}
              
            
!

JS

              
                document.querySelector("#turn-page").addEventListener("click", function() {
  document.querySelector("body").classList.toggle("active");
})
              
            
!
999px

Console