Five examples ahead:
Using <detail> and <summary> tags (pure HTML)
You can use HTML5's detail and summary tags to solve this problem without any CSS styling or JavaScript:
<details>
<summary>Collapse 1</summary>
<div>Content 1...</div>
</details>
<details>
<summary>Collapse 2</summary>
<div>Content 2...</div>
</details>
Using label and checkbox input
Keeps the selected item opened and togglable.
.collapse{
cursor: pointer;
display: block;
background: #cdf;
}
.collapse + input{
display: none; /* hide the checkboxes */
}
.collapse + input + div{
display:none;
}
.collapse + input:checked + div{
display:block;
}
<label class="collapse" for="_1">Collapse 1</label>
<input id="_1" type="checkbox">
<div>Content 1</div>
<label class="collapse" for="_2">Collapse 2</label>
<input id="_2" type="checkbox">
<div>Content 2</div>
Using label and named radio input
Similar to checkboxes, it just closes the already opened one.
Use name="c1" type="radio" on both inputs.
.collapse{
cursor: pointer;
display: block;
background: #cdf;
}
.collapse + input{
display: none; /* hide the checkboxes */
}
.collapse + input + div{
display:none;
}
.collapse + input:checked + div{
display:block;
}
<label class="collapse" for="_1">Collapse 1</label>
<input id="_1" type="radio" name="c1">
<div>Content 1</div>
<label class="collapse" for="_2">Collapse 2</label>
<input id="_2" type="radio" name="c1">
<div>Content 2</div>
Using tabindex and :focus
Similar to radio inputs, additionally you can trigger the states using the Tab key.
Clicking outside of the accordion will close all opened items.
.collapse > a{
background: #cdf;
cursor: pointer;
display: block;
}
.collapse:focus{
outline: none;
}
.collapse > div{
display: none;
}
.collapse:focus div{
display: block;
}
<div class="collapse" tabindex="1">
<a>Collapse 1</a>
<div>Content 1....</div>
</div>
<div class="collapse" tabindex="1">
<a>Collapse 2</a>
<div>Content 2....</div>
</div>
Using :target
Similar to using radio input, you can additionally use Tab and ⏎ keys to operate
.collapse a{
display: block;
background: #cdf;
}
.collapse > div{
display:none;
}
.collapse > div:target{
display:block;
}
<div class="collapse">
<a href="#targ_1">Collapse 1</a>
<div id="targ_1">Content 1....</div>
</div>
<div class="collapse">
<a href="#targ_2">Collapse 2</a>
<div id="targ_2">Content 2....</div>
</div>