I'm not 100% sure what you're trying to achieve, but if you need to add animations on an element(s) with JS after some event, consider the following way:
Define styles with css like
.hidden{...}.animate{...}
Add/remove CSS classes with animations when necessary with DOM API: document.querySelectorAll('.hidden').classList.add('animate')
Thanks for writing but I just wanted to update an element's CSS with JS.
no more new class I wanted to Edit animation-duration value from JS.
I resolve it thx
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I'm not 100% sure what you're trying to achieve, but if you need to add animations on an element(s) with JS after some event, consider the following way:
document.querySelectorAll('.hidden').classList.add('animate')Thanks for writing but I just wanted to update an element's CSS with JS.
no more new class I wanted to Edit animation-duration value from JS.
I resolve it thx