Issues

Transitions keep their element alive on iOS WebKit (cancelled dummy animation keeps its onfinish handler)

sveltejs/svelte#19082 · opened

on Oct 23, 2026

1

SSR: spread `defaultValue` on `<textarea>` renders as a `defaultvalue` attribute (same for `defaultChecked` on `<svelte:element>`)

sveltejs/svelte#19072 · opened

on Oct 22, 2026

Dev `__svelte_meta` missing on elements after a component after hydration

sveltejs/svelte#19069 · opened

on Oct 22, 2026

Writable `$derived` drops an override equal to its stale cached value

sveltejs/svelte#19057 · opened

on Oct 21, 2026

1

Bound values reset when a reset button click is cancelled with preventDefault()

sveltejs/svelte#19055 · opened

on Oct 21, 2026

1

$effect and bind:this in a pending boundary never run when its batch is merged into an earlier one (experimental.async)

sveltejs/svelte#19049 · opened

on Oct 20, 2026

1

Async: overlapping derived values retain a stale result after all promises resolve

sveltejs/svelte#19047 · opened

on Oct 20, 2026

1

Keyed each items are never removed when outros of zero and non-zero duration run together

sveltejs/svelte#19041 · opened

on Oct 18, 2026

1

Hydrated `<input value={...}>` loses typed text the first time its template effect re-runs

sveltejs/svelte#19038 · opened

on Oct 18, 2026

Spread props on customized built-in elements skip their setters

sveltejs/svelte#19034 · opened

on Oct 17, 2026

2

Writing state inside an effect costs time exponential in the depth of shared deriveds downstream

sveltejs/svelte#19032 · opened

on Oct 17, 2026

HMR callback crashes when Vite passes an undefined module

sveltejs/svelte#19029 · opened

on Oct 16, 2026

1

Errors thrown while rendering an `{#await}` branch skip `<svelte:boundary>`

sveltejs/svelte#19026 · opened

on Oct 16, 2026

1

Object and array props on custom elements are rendered as attributes during SSR

sveltejs/svelte#19022 · opened

on Oct 16, 2026

1

Event handlers after <svelte:boundary> don't run when a client-only branch inside it throws during hydration

sveltejs/svelte#19020 · opened

on Oct 16, 2026

1

SSR: `onDestroy` doesn't run for components rendered in a discarded `bind:` re-render pass

sveltejs/svelte#19016 · opened

on Oct 15, 2026

[Feature Request] Ability to check if a signal is currently being used

sveltejs/svelte#19015 · opened

on Oct 15, 2026

3

Custom element props passed through a spread are set inside the spread's effect

sveltejs/svelte#19010 · opened

on Oct 15, 2026

1

Async mode: removing a hydrated keyed {#each} item also removes the items before it (regression in 5.56.2)

sveltejs/svelte#19000 · opened

on Oct 14, 2026

2

`experimental.async`: a `$derived` re-runs on every read while another batch is pending (amplified since 5.46.3)

Bug

sveltejs/svelte#18997 · opened

on Oct 14, 2026

2

Async hydration reads stale pre-mount writes and removes the component tree

Bug

sveltejs/svelte#18993 · opened

on Oct 14, 2026

HTML in option elements cause hydration markers that fail W3C validation (bogus comment)

sveltejs/svelte#18986 · opened

on Oct 13, 2026

SSR: `onDestroy` doesn't run for children of a `<svelte:boundary>` that fails synchronously

sveltejs/svelte#18975 · opened

on Oct 11, 2026

`$effect.pending()` or `$state.eager()` inside `$derived` keeps unmounted components in memory

sveltejs/svelte#18970 · opened

on Oct 10, 2026

1

a11y_no_noninteractive_tabindex: false positive when role and tabindex are chosen by the same condition

sveltejs/svelte#18968 · opened

on Oct 10, 2026

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Issues

Transitions keep their element alive on iOS WebKit (cancelled dummy animation keeps its onfinish handler)

SSR: spread `defaultValue` on `<textarea>` renders as a `defaultvalue` attribute (same for `defaultChecked` on `<svelte:element>`)

Dev `__svelte_meta` missing on elements after a component after hydration

Writable `$derived` drops an override equal to its stale cached value

Bound values reset when a reset button click is cancelled with preventDefault()

$effect and bind:this in a pending boundary never run when its batch is merged into an earlier one (experimental.async)

Async: overlapping derived values retain a stale result after all promises resolve

Keyed each items are never removed when outros of zero and non-zero duration run together

Hydrated `<input value={...}>` loses typed text the first time its template effect re-runs

Spread props on customized built-in elements skip their setters

Writing state inside an effect costs time exponential in the depth of shared deriveds downstream

HMR callback crashes when Vite passes an undefined module

Errors thrown while rendering an `{#await}` branch skip `<svelte:boundary>`

Object and array props on custom elements are rendered as attributes during SSR

Event handlers after <svelte:boundary> don't run when a client-only branch inside it throws during hydration

SSR: `onDestroy` doesn't run for components rendered in a discarded `bind:` re-render pass

[Feature Request] Ability to check if a signal is currently being used

Custom element props passed through a spread are set inside the spread's effect

Async mode: removing a hydrated keyed {#each} item also removes the items before it (regression in 5.56.2)

`experimental.async`: a `$derived` re-runs on every read while another batch is pending (amplified since 5.46.3)

Async hydration reads stale pre-mount writes and removes the component tree

HTML in option elements cause hydration markers that fail W3C validation (bogus comment)

SSR: `onDestroy` doesn't run for children of a `<svelte:boundary>` that fails synchronously

`$effect.pending()` or `$state.eager()` inside `$derived` keeps unmounted components in memory

a11y_no_noninteractive_tabindex: false positive when role and tabindex are chosen by the same condition