Svelte Guideline: Bindings — Use bind: for two-way binding. Description: Simplified input handling. Do: bind:value for inputs. Don't: on:input with manual update. Good Example: <input bind:value={name}>. Bad Example: <input value={name} on:input={e => name = e.target.value}>. Severity: Low. Docs: https://svelte.dev/docs/element-directives#bind-property.