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                <input type="radio" name="rozmiar" value="200"> 200
<input type="radio" name="rozmiar" value="300"> 300
<input type="radio" name="rozmiar" value="500"> 500
<div id="opis"></div>




                /* OPIS
Metoda .querySelectorAll() wybiera wszystkie elementy
spełniające kryterium w tym przykładzie znaczniki input.
Wynik tego wyboru - zmienna elementyRadio - jest spisem 
- czymś "podobnym" do tablicy.
Elementy tej pseudotablicy można z niej wybierać za pomocą pętli 
for(const radio of elementyRadio).

Wybrany element przypisywany jest do zmmiennej radio 
i do każdej z tych zmiennych przypisywane jest 
metodą addEventListener() zdarzenie "click".
const div=document.querySelector('div');
const elementyRadio=document.querySelectorAll('input');
for(const radio of elementyRadio) {
	radio.addEventListener("click",function() {