Adding Border Implementation for widget on hover like in webflow

In webflow when we hover over an element it shows a blue border.(See Video) I am interested in knowing how it is implemented. I have done my research and could make a basic guess of its implementation.

1 Listen to mouseover event on the body 2 then on mouseover update use document.getelementfrompoint() to get the element node at the point Now using an absolutely positioned div add a border at the hovered node rect.

The question is my guess correct? Is there a threshold amount that we need to check to avoid calling mousemove handler?

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