{#snippet children()}Button{/snippet}
{#each variants as variant} {/each}
{#each sizes as size} {/each}
{#each variants as variant} {/each}

Without elementStyle

{#each elements as element} {/each}

With elementStyle

{#each elements as element} {/each}
{#each variants as variant} {variant} {/each}
{#each sizes as size}
{size} {#each variants as variant} {/each}
{/each}