data-effect — localStorage persist

Value persists across page refreshes — stored in localStorage via data-effect.

data-ref + data-effect — measure an element

Resize me ↘

W: H:

data-effect — reactive document.title

Increment the counter above — watch the browser tab title update reactively.

data-effect runs whenever any signal it reads ($persist) changes.

data-init vs data-effect

data-initRuns once on mount. Does NOT re-run when signals change.

data-effectRe-runs whenever any signal it reads changes. Reactive.

data-on-intervalRuns on a timer regardless of signal changes.