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<nav class="main-nav">
<ul class="nav-list">
<li><a href="">Lorem ipsum.</a></li>
<li>
<button class="submenu-toggle-button">+</button>
<a href="">Explicabo, perspiciatis.</a>
<ul class="submenu nav-list">
<li><a href="">Lorem ipsum.</a></li>
<li><a href="">Culpa, qui!</a></li>
<li><a href="">Repudiandae, eaque.</a></li>
</ul>
</li>
<li><a href="">Sit, dolor.</a></li>
<li><a href="">Dicta, possimus?</a></li>
<li>
<button class="submenu-toggle-button">+</button>
<a href="">Iste, voluptatem!</a>
<ul class="submenu nav-list">
<li><a href="">Lorem ipsum.</a></li>
<li><a href="">Culpa, qui!</a></li>
<li><a href="">Repudiandae, eaque.</a></li>
</ul>
</li>
<li><a href="">Soluta, blanditiis!</a></li>
<li><a href="">Nostrum, adipisci.</a></li>
<li><a href="">At, cumque!</a></li>
<li><a href="">Natus, ut!</a></li>
<li><a href="">Impedit, illum.</a></li>
</ul>
</nav>
<main>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Fugit, accusamus. Officiis natus ad fugiat. Reiciendis magnam in, recusandae eum fugit corporis similique modi saepe sapiente quasi mollitia aliquam ipsam veritatis natus quidem eius nesciunt eligendi? Omnis eos dolor ea soluta vero quibusdam, eaque et eveniet recusandae facere quos deserunt animi architecto at dolorem blanditiis pariatur deleniti quaerat vitae, sit odio officiis. Laboriosam facilis vel adipisci quia omnis, dolores nam inventore labore. Dignissimos nihil reiciendis nesciunt suscipit, blanditiis accusantium ratione culpa. Illum perferendis porro molestias.</p>
<p>Voluptates, accusantium suscipit quis delectus sapiente, maiores cum et commodi quam itaque quae esse odit inventore molestiae ipsum vero. Facere quidem quaerat perspiciatis esse quibusdam est consectetur soluta. Reiciendis, iure, distinctio officiis nihil possimus eos, aliquid architecto quia rem sit at assumenda aut illum. Beatae, dolores. Voluptatibus excepturi sapiente repudiandae, hic doloribus nostrum amet fugit velit mollitia, laudantium alias cumque ullam nemo voluptatem facere ex consectetur perspiciatis ipsa odio. Animi, minus, voluptate? Minima tenetur deleniti sint beatae maxime cupiditate voluptate vitae ducimus assumenda alias.</p>
<p>Ipsam consequuntur eius, ducimus iure voluptates quod earum dolorem repudiandae, in expedita vitae ratione provident vero minima, veritatis quidem repellat aliquid quam. Quos eveniet doloribus laboriosam assumenda quaerat placeat, architecto deleniti voluptatibus vitae adipisci tenetur optio perspiciatis aspernatur ipsum omnis possimus blanditiis ratione reiciendis alias vel itaque ab, sunt officia explicabo! Tenetur cupiditate aspernatur quod, libero? Distinctio quia, impedit illo ut, deleniti beatae tempora explicabo consequatur officia molestias aliquid quasi sint illum, cum omnis repellendus autem? Qui eligendi laudantium eos aut quasi omnis repellendus.</p>
<p>Ipsum incidunt quas assumenda illo omnis enim quod ratione unde nobis, fugiat beatae officia nostrum similique natus et eaque expedita impedit ducimus esse saepe dolore necessitatibus maxime eligendi dolores. Quidem neque, laboriosam molestiae alias et quaerat, laborum totam ea fugit sit quisquam consectetur, hic architecto corporis enim! Ut impedit consequatur explicabo consectetur ab vel, nam sapiente nulla, voluptatum architecto quod incidunt! Obcaecati dignissimos quidem, dolor, at repudiandae eveniet est ea possimus, eius adipisci non dolorem velit consequuntur natus facere blanditiis nemo totam praesentium voluptate.</p>
<p>Enim, ab, totam! Quo recusandae iste, commodi dolor eos dolorem eius aperiam, enim illo illum debitis maxime modi similique veritatis accusantium, nulla corporis hic dolorum magnam laborum. Hic saepe, sunt accusamus neque dolores vitae odio deleniti delectus fugit facilis at doloribus mollitia, quis aliquid officia pariatur culpa nobis tenetur fugiat officiis nam fuga suscipit! Vitae blanditiis rerum commodi consequatur modi id, nam ullam quisquam voluptatum hic recusandae quam quas fuga incidunt corporis. Magni esse necessitatibus inventore, dicta totam ipsa nostrum eligendi enim alias cum!</p>
<p>Esse fuga ex perspiciatis dignissimos minus eos id, quo nisi obcaecati quis cum. Earum, ut cumque beatae. Possimus aliquam aliquid animi ad veritatis debitis rem omnis molestiae doloremque placeat, harum cupiditate cum. Consectetur ipsa quas nulla assumenda sunt possimus sit eaque vitae totam consequatur repellat, reprehenderit, commodi eveniet! Cupiditate, sit deserunt voluptate itaque optio voluptas nostrum illum explicabo dolore hic vel assumenda doloremque fugiat placeat animi similique beatae minus quos, eius in? Magnam debitis iusto, quo molestias repellendus velit illum, pariatur dolorem dolores similique.</p>
<p>Qui fugit, optio minima minus hic odit quos eaque et rem! Incidunt eos nihil hic temporibus fuga veritatis autem, obcaecati id minima dolore sed, delectus, unde. Hic accusantium dolorum, corporis eveniet dolores laudantium nihil laboriosam autem illo consectetur iste quibusdam, in placeat deleniti at quos sed porro nulla? Dolore cum rem in reiciendis temporibus sunt dignissimos expedita doloremque facilis. Nesciunt, provident earum quae ipsum vel est quis, dolore praesentium, quaerat sunt facere vitae quasi suscipit esse veniam, ducimus sed quam itaque autem natus debitis!</p>
<p>Vitae cum doloribus dolorum facere, nam repellat, distinctio voluptatem maxime temporibus, molestiae assumenda accusamus dolores consequatur ex ab et laudantium minus magnam cumque alias, itaque dolorem ipsa deserunt fuga. Dolor ipsum dignissimos laborum, eius odit, nisi in veritatis voluptatibus odio, neque, laboriosam esse amet recusandae itaque aperiam qui fuga illo quidem repellat perspiciatis est. Animi repellat quibusdam asperiores, beatae nobis illum obcaecati fugiat adipisci voluptatem unde quod, aperiam nam minus at nisi, perspiciatis soluta magni debitis. Saepe exercitationem ut at quos, architecto ea asperiores.</p>
<p>Suscipit deserunt assumenda porro, sit aspernatur nisi, unde provident cupiditate veniam architecto fuga. Ex earum corporis, recusandae inventore debitis veritatis enim, minima suscipit laudantium vero libero ratione tempora explicabo voluptates cupiditate, reprehenderit sunt. Eaque amet cum, soluta repellendus, ipsa ducimus obcaecati quas eos qui dolorum praesentium. Omnis fuga illo, repellat! Error, dolorem numquam. Eaque temporibus sequi, asperiores dignissimos eius, laudantium necessitatibus et aut veritatis perferendis facilis quam maiores nobis rem dolor non tenetur tempora eveniet? Assumenda asperiores dolore, aperiam! Repudiandae cum ut fuga nihil.</p>
<p>Laborum nostrum deserunt corporis, quas, non commodi sit harum iste dignissimos doloribus, minima id temporibus obcaecati consequuntur esse voluptates quasi maiores et velit quidem optio molestias voluptas quaerat qui! Quae repudiandae nobis molestias pariatur quis, explicabo deleniti assumenda, magnam. Suscipit voluptates beatae laborum consequatur asperiores, fugiat tenetur, rerum modi repellendus libero deleniti at adipisci error veniam, quisquam nihil commodi obcaecati minus esse architecto assumenda ab? Ratione pariatur libero natus deserunt consequatur animi eaque ducimus excepturi consectetur quibusdam ad fugiat accusantium soluta, officiis in rerum.</p>
<p>Animi debitis error quia eius. Odit nobis suscipit molestiae illo consequuntur harum perspiciatis esse pariatur similique voluptatem? Reprehenderit a tempore modi aut mollitia doloribus hic, omnis asperiores ratione quos consectetur ducimus accusantium facere minus voluptatibus odio quas, soluta impedit adipisci iusto. Facilis molestias eaque deserunt dolore consectetur ea laudantium reiciendis nemo accusamus quaerat maiores enim labore, ad corporis aperiam, sequi obcaecati consequuntur adipisci libero? Suscipit illo labore laudantium repellat odit atque reiciendis itaque molestiae debitis non a delectus, autem rem, animi architecto numquam fugit.</p>
<p>Inventore explicabo eligendi ullam fugiat laboriosam voluptates facere similique molestias recusandae atque, doloremque sint totam. Natus aliquam hic, nemo perferendis iure itaque nihil maxime quae officiis, aliquid deleniti ipsa architecto, expedita nam nisi dolore. Ex a in aut totam minus id sint nam vel cumque saepe, reprehenderit veritatis earum culpa architecto eaque quo. Vitae dignissimos exercitationem, ratione laudantium aliquid quia ab ipsa qui illum! Ipsam eaque ut beatae explicabo velit rerum consequatur mollitia repellendus, iure, obcaecati provident iusto odio reprehenderit consequuntur sint laborum sed.</p>
</main>
* {
box-sizing: border-box;
}
html {
font-family: "Georgia", Sans-Serif;
font-size: 115%;
line-height: 1.5;
}
body, html {
margin: 0;
}
.main-nav {
background: lightyellow;
}
.main-nav > ul {
height: 100vh;
display: flex;
flex-direction: column;
}
.main-nav > ul > li {
flex: 1;
}
.nav-list {
margin: 0;
padding: 0;
list-style: none;
}
.nav-list > li {
padding: 0 1.25rem 0 0.25rem;
position: relative;
}
.nav-list > li > a {
text-decoration: none;
color: #43b88c;
display: block;
padding: 0.5rem;
white-space: nowrap;
}
.nav-list > li > a:hover {
color: black;
}
.submenu-toggle-button {
position: absolute;
right: 0.7rem;
top: 0.7rem;
}
.submenu {
max-height: 0;
transition: 0.5s;
overflow: hidden;
width: 100%;
padding-left: 1.5rem;
}
.submenu.open {
max-height: 200px;
}
body {
display: flex;
}
main {
padding: 2rem;
}
main p {
margin: 0 0 1rem 0;
}
var buttons = document.querySelectorAll('.submenu-toggle-button');
[].forEach.call(buttons, function(button) {
button.addEventListener('click', function() {
var submenu = button.parentNode.querySelector('.submenu');
submenu.classList.toggle('open');
});
});
Also see: Tab Triggers