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1. We clear `setInterval` timer when the element is removed from the document. That's important, otherwise it continues ticking even if not needed any more. And the browser can't clear the memory from this element and referenced by it.
2. We can access current date as `elem.date` property. All class methods and properties are naturally element methods and properties.
Nota bene:
1. Quando rimuoviamo l'elemento dal documento, eseguiamo il clear di `setInterval` per il timer. È importante, altrimenti continuerà a ticchettare anche se non più necessario. Inoltre il browser avendo ancora un riferimento ad esso, non sarà in grado di pulire la sua memoria.
2. Deve essere possibile accedere alla data corrente tramite la proprietà `elem.date`. Tutti i metodi della classe e le relative proprietà devono anche essere metodi e proprietà dell'elemento.
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We already have `<time-formatted>` element to show a nicely formatted time.
Abbiamo già un elemento `<time-formatted>` per mostrare un orario formattato.
Create `<live-timer>` element to show the current time:
1. It should use `<time-formatted>` internally, not duplicate its functionality.
2. Ticks (updates) every second.
3. For every tick, a custom event named `tick` should be generated, with the current date in `event.detail` (see chapter <info:dispatch-events>).
Create un elemento `<live-timer>` per mostrare l'orario corrente con queste specifiche:
1. Internamente dovrebbe usare `<time-formatted>`, senza duplicarne la funzionalità.
2. Un tick (aggiornamento) ogni secondo.
3. Per ogni tick, deve essere generato un evento personalizzato chiamato `tick`, con la data corrente dentro `event.detail` (guardare il capitolo <info:dispatch-events>).
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Custom elements #277
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Custom elements #277
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