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Created September 15, 2025 13:38
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Styling <details>: Horizontal Accordion (no animation)
Raw
index.html
<script>
document.documentElement.dataset.embed = window.location.search.includes('type=embed') ? "yep" : "nope";
</script>
<main>
<h1>Styling <code>&lt;details&gt;</code>: Horizontal Accordion <em>(no animation)</em></h1>
<h2>Demo</h2>
<div id="demo">
<div class="accordion-wrapper">
<details name="accordion" id="boating" open>
<summary>
<span>🚤</span>
<img draggable=false src="https://raw.githubusercontent.com/kevin-powell/accordion/8551c559e3e8d9a9cca7a983c9e8903ef533f189/public/assets/boat.webp" alt="">
</summary>
<div class="details-content-wrapper">
<h3>Boating</h3>
<p>Port mutiny draught handsomely ye furl flogging line shrouds hulk. Spirits Plate Fleet code of conduct.</p>
</div>
</details>
<details name="accordion" id="anchoring">
<summary>
<span>⚓️</span>
<img draggable=false src="https://raw.githubusercontent.com/kevin-powell/accordion/8551c559e3e8d9a9cca7a983c9e8903ef533f189/public/assets/anchor.webp" alt="">
</summary>
<div class="details-content-wrapper">
<h3>Anchoring</h3>
<p>Ahoy league hands Sea Legs keelhaul salmagundi fire ship crimp Privateer galleon. Booty boom yard boatswain quarter.</p>
</div>
</details>
<details name="accordion" id="fishing">
<summary>
<span>🎣</span>
<img draggable=false src="https://raw.githubusercontent.com/kevin-powell/accordion/8551c559e3e8d9a9cca7a983c9e8903ef533f189/public/assets/fishing.webp" alt="">
</summary>
<div class="details-content-wrapper">
<h3>Fishing</h3>
<p>No prey, no pay heave down splice the main brace furl cable snow walk the plank chase guns piracy bucko.</p>
</div>
</details>
<details name="accordion" id="lighthouses">
<summary>
<span>🔦</span>
<img draggable=false src="https://raw.githubusercontent.com/kevin-powell/accordion/8551c559e3e8d9a9cca7a983c9e8903ef533f189/public/assets/lighthouse.webp" alt="">
</summary>
<div class="details-content-wrapper">
<h3>Lighthouses</h3>
<p>Deadlights squiffy salmagundi cable pinnace parrel topsail Corsair Arr mizzenmast.</p>
</div>
</details>
<details name="accordion" id="reefs">
<summary>
<span>🪸</span>
<img draggable=false src="https://raw.githubusercontent.com/kevin-powell/accordion/8551c559e3e8d9a9cca7a983c9e8903ef533f189/public/assets/reef.webp" alt="">
</summary>
<div class="details-content-wrapper">
<h3>Reefs</h3>
<p>Keel yard poop deck brigantine gaff six pounders bring a spring
upon her cable interloper lad pink.</p>
</div>
</details>
</div>
</div>
<p>Demo for <a href="https://developer.chrome.com/blog/styling-details" target="_top">https://developer.chrome.com/blog/styling-details</a>, built after <a href="https://codepen.io/jakob-e/full/MWzRjNe" target="_top">https://codepen.io/jakob-e/full/MWzRjNe</a></p>
<h2>The Code</h2>
<h3>UI</h3>
<pre><code>.accordion-wrapper {
display: flex;
flex-direction: row;
gap: 1rem;
}
details {
display: flex;
flex-direction: row;
height: 30rem;
border-radius: 2rem;
overflow: hidden;
/* To make the image positioning work …*/
position: relative;
z-index: 1;
/* Hide marker */
::marker {
content: '';
}
/* The image is tucked in the summary, because otherwise it would be hidden when not [open] as it ends up in the ::details-content pseudo */
summary img {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
object-fit: cover;
z-index: -1;
transition: filter 0.5s ease;
}
/* Animate the image */
&[open] summary img {
filter: brightness(0.5);
}
summary {
padding: 1rem 1em;
width: 5rem;
flex-shrink: 0; /* Prevent shrinking */
text-align: center;
}
.details-content-wrapper {
padding: 1.5rem 1em;
width: 300px; /* Fixate the width of the content so that the text doesn’t wrap/unwrap when expanding the details */
}
}
.details-content-wrapper {
/* Animate-in the text when open */
p {
transform: translateY(2rem);
opacity: 0;
transition: all 0.5s ease;
transition-delay: 0.5s;
}
[open] & p {
transform: none;
opacity: 1;
transition-delay: 0.5s;
}
}</code></pre>
</main>
Raw
style.css
@supports selector(::details-content) {
.warning {
display: none;
}
}
.accordion-wrapper {
display: flex;
flex-direction: row;
gap: 1rem;
width: min-content;
margin: 0 auto;
}
details {
display: flex;
flex-direction: row;
background: transparent;
color: white;
height: 30rem;
border-radius: 2rem;
overflow: hidden;
/* To make the image work …*/
position: relative;
z-index: 1;
/* Hide marker */
::marker {
content: '';
}
/* The image is tucked in the summary, because otherwise it would be hidden when not [open] as it ends up in the ::details-content pseudo */
summary img {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
object-fit: cover;
z-index: -1;
transition: filter 0.5s ease;
}
/* Animate the image */
&[open] summary img {
filter: brightness(0.5);
}
summary {
padding: 1rem 1em;
width: 5rem;
flex-shrink: 0; /* Prevent shrinking */
text-align: center;
span {
display: grid;
place-content: center;
width: 100%;
aspect-ratio: 1;
border-radius: 50%;
background: rgb(0 0 0 / 0.25);
}
&:focus {
outline: none;
}
}
.details-content-wrapper {
padding: 1.5rem 1em;
width: 300px;
}
&:hover, &:has(summary:focus) {
outline: 3px solid cadetblue;
outline-offset: 3px;
}
}
.details-content-wrapper {
/* We need margin-trim … */
:first-child { margin-top: 0; }
:last-child { margin-bottom: 0; }
/* Animate-in the text when open */
p {
transform: translateY(2rem);
opacity: 0;
transition: all 0.5s ease;
transition-delay: 0.5s;
}
[open] & p {
transform: none;
opacity: 1;
transition-delay: 0.5s;
}
}
@layer reset {
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
height: 100%;
}
html {
font-size: 14px;
}
}
@layer baselayout {
html {
color: #444;
font-family: system-ui;
line-height: 1.42;
overscroll-behavior-x: none;
overflow: auto;
}
main {
max-width: 90ch;
margin: 0 auto;
padding-bottom: 10rem;
}
p {
margin-bottom: 1em;
}
h1, h2 {
margin: 4em 0 1em;
}
h3 {
margin: 1em 0 0.5em;
}
#demo {
padding: 1em;
border: 1px solid #ccc;
background: #f4f6f9;
}
}
@layer code {
pre {
border: 1px solid #dedede;
padding: 1em;
background: #f7f7f7;
font-family: "Courier 10 Pitch", Courier, monospace;
overflow-x: auto;
border-left: 0.4em solid cornflowerblue;
tab-size: 4;
}
code:not(pre code) {
background: #f7f7f7;
border: 1px solid rgb(0 0 0 / 0.2);
padding: 0.1rem 0.3rem;
margin: 0.1rem 0;
border-radius: 0.2rem;
/* display: inline-block; */
-webkit-box-decoration-break: clone;
white-space: pre-wrap;
}
}
@layer warning {
.warning {
box-sizing: border-box;
padding: 1em;
margin: 1em 0;
border: 1px solid #ccc;
background: rgba(255 255 205 / 0.8);
}
.warning > :first-child {
margin-top: 0;
}
.warning > :last-child {
margin-bottom: 0;
}
.warning a {
color: blue;
}
.warning--info {
border: 1px solid #123456;
background: rgb(205 230 255 / 0.8);
}
.warning--alarm {
border: 1px solid red;
background: #ff000010;
}
}
/* Hide a bunch of stuff when embedded */
:root[data-embed="yep"] {
main {
padding: 2em 1em;
:not(p.warning, p.warning *, #demo, #demo *, #demo ~ p, #demo ~ p *) {
display: none;
}
}
#demo ~ p {
margin-top: 1em;
text-align: center;
}
}
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