html5 - How to position an element relative to window scroll position using CSS? -

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i'm trying position element on screen based on following formula:

element.style.top = element.pivot_y + window.scrolly;

i'm doing using javascript, window.requestanimationframe. problem requestanimationframe not available on browsers, have fallback timer, which makes element wiggle due lack of synchronisation rendering. this, can position element similarly, without invoking javascript?

as far understand should possible position: fixed; , top: pivot_y pivot_y has fixed number


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