Basic Svelte
Introduction
Bindings
Advanced Svelte
Advanced reactivity
Motion
Advanced bindings
Advanced transitions
Context API
Special elements
<script module>
Next steps
Basic SvelteKit
Introduction
Routing
Loading data
Headers and cookies
Shared modules
API routes
$app/state
Errors and redirects
Advanced SvelteKit
Page options
Link options
Advanced routing
Advanced loading
Environment variables
Conclusion
Often, the name of the class will be the same as the name of the value it depends on:
<button
class="card"
class:flipped={flipped}
onclick={() => flipped = !flipped}
>In those cases we can use a shorthand form:
App
<button
class="card"
class:flipped
onclick={() => flipped = !flipped}
>previous next
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<script>
let flipped = $state(false);
</script>
<div class="container">
Flip the card
<button
class="card"
class:flipped={flipped} onclick={() => flipped = !flipped}>
<div class="front">
<span class="symbol">♠</span>
</div>
<div class="back">
<div class="pattern"></div>
</div>
</button>
</div>
<style>
.container {display: flex;
flex-direction: column;
gap: 1em;
height: 100%;
align-items: center;
justify-content: center;
perspective: 100vh;
}
.card {position: relative;
aspect-ratio: 2.5 / 3.5;
font-size: min(1vh, 0.25rem);
height: 80em;
background: var(--bg-1);
border-radius: 2em;
transform: rotateY(180deg);
transition: transform 0.4s;
transform-style: preserve-3d;
padding: 0;
user-select: none;
cursor: pointer;
}
.card.flipped {transform: rotateY(0);
}
.front, .back {display: flex;
align-items: center;
justify-content: center;
position: absolute;
width: 100%;
height: 100%;
left: 0;
top: 0;
backface-visibility: hidden;
border-radius: 2em;
border: 1px solid var(--fg-2);
box-sizing: border-box;
padding: 2em;
}
.front {background: url(./svelte-logo.svg) no-repeat 5em 5em, url(./svelte-logo.svg) no-repeat calc(100% - 5em) calc(100% - 5em);
background-size: 8em 8em, 8em 8em;
}
.back {transform: rotateY(180deg);
}
.symbol {font-size: 30em;
color: var(--fg-1);
}
.pattern {width: 100%;
height: 100%;
background-color: var(--bg-2);
/* pattern from https://projects.verou.me/css3patterns/#marrakesh */
background-image:
radial-gradient(var(--bg-3) 0.9em, transparent 1em),
repeating-radial-gradient(var(--bg-3) 0, var(--bg-3) 0.4em, transparent 0.5em, transparent 2em, var(--bg-3) 2.1em, var(--bg-3) 2.5em, transparent 2.6em, transparent 5em);
background-size: 3em 3em, 9em 9em;
background-position: 0 0;
border-radius: 1em;
}
</style>