Css class selector not working

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1

on product page there is product info section. which is accordian and by default it is expanded but i want it to be collapsed by default. I am getting syntax error in below code.
do wixs does not allow class selectors?

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2

→ Selecting one specific ACCORDION.
$w('#ProductInfoAccordion').onClick(()=>{......});

→ Selecting several specific ACCORDIONS.
$w('#ACORD1, #ACORD2, #ACORD3').onClick(()=>{......});

→ Selecting ALL-ACCORDIONS.
$w('Aaccordion').onClick(()=>{......});

And about CSS-Classes —> CSS Classes - Velo API Reference - Wix.com

→ Selecting ACCORDION-CLASSES → 

.accordion {
  opacity: 75%;
  display: flex;
}

But since i did not test it yet, i can’t give you are 100% sure answer.