Acordeón accesible y adaptable con transiciones CSS3

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Descripción

Un acordeón CSS puro, receptivo y accesible que utiliza transiciones CSS3 para animaciones suaves de apertura/cierre. Utiliza casillas de verificación + etiqueta o radio + etiquetas hacks para alternar los paneles de acordeón, dependiendo de si uno o varios paneles pueden estar abiertos al mismo tiempo.

¿Cómo funciona?

Crear un acordeón usando HTML lista desordenada y el hack casilla de verificación. Esto significa que se pueden abrir múltiples paneles de acordeón al mismo tiempo.

<ul class="accordion css-accordion">

<li class="accordion-item">


<input class="accordion-item-input" type="checkbox" name="accordion" id="item1" />


<label for="item1" class="accordion-item-hd">Accordion Heading 1<span class="accordion-item-hd-cta">&#9650;</span></label>


<div class="accordion-item-bd">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ex consequuntur architecto maxime, saepe repudiandae quidem quisquam aliquam cumque possimus inventore, deserunt nostrum, explicabo modi voluptatibus sed, labore quaerat. Accusamus, officiis. </div>

</li>

<li class="accordion-item">


<input class="accordion-item-input" type="checkbox" name="accordion" id="item2" />


<label for="item2" class="accordion-item-hd">Accordion Heading 2<span class="accordion-item-hd-cta">&#9650;</span></label>


<div class="accordion-item-bd">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ex consequuntur architecto maxime, saepe repudiandae quidem quisquam aliquam cumque possimus inventore, deserunt nostrum, explicabo modi voluptatibus sed, labore quaerat. Accusamus, officiis. </div>

</li>

<li class="accordion-item">


<input class="accordion-item-input" type="checkbox" name="accordion" id="item3" />


<label for="item3" class="accordion-item-hd">Accordion Heading 3<span class="accordion-item-hd-cta">&#9650;</span></label>


<div class="accordion-item-bd">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ex consequuntur architecto maxime, saepe repudiandae quidem quisquam aliquam cumque possimus inventore, deserunt nostrum, explicabo modi voluptatibus sed, labore quaerat. Accusamus, officiis. </div>

</li>
</ul>

Los estilos CSS/CSS3 requeridos.

.accordion {

border: 1px solid white;

padding: 0 10px;

margin: 0 auto;

list-style: none outside;
}

.accordion > * + * { border-top: 1px solid white; }

.accordion-item-hd {

display: block;

padding: 15px 30px 15px 0;

position: relative;

cursor: pointer;

font-size: 18px;

font-weight: bold;
}

.accordion-item-input:checked ~ .accordion-item-bd {

max-height: 1000px;

padding-top: 15px;

margin-bottom: 15px;

-webkit-transition: max-height 1s ease-in, margin .3s ease-in, padding .3s ease-in;

transition: max-height 1s ease-in, margin .3s ease-in, padding .3s ease-in;
}

.accordion-item-input:checked ~ .accordion-item-hd > .accordion-item-hd-cta {

-webkit-transform: rotate(0);

-ms-transform: rotate(0);

transform: rotate(0);
}

.accordion-item-hd-cta {

display: block;

width: 30px;

position: absolute;

top: calc(50% - 6px );

right: 0;

pointer-events: none;

-webkit-transition: -webkit-transform .3s ease;

transition: transform .3s ease;

-webkit-transform: rotate(-180deg);

-ms-transform: rotate(-180deg);

transform: rotate(-180deg);

text-align: center;

font-size: 12px;

line-height: 1;
}

.accordion-item-bd {

max-height: 0;

margin-bottom: 0;

overflow: hidden;

-webkit-transition: max-height .15s ease-out, margin-bottom .3s ease-out, padding .3s ease-out;

transition: max-height .15s ease-out, margin-bottom .3s ease-out, padding .3s ease-out;
}

.accordion-item-input {

clip: rect(0 0 0 0);

width: 1px;

height: 1px;

margin: -1;

overflow: hidden;

position: absolute;

left: -9999px;
}