I have a tooltip slds div which is displayed when hovered over Task bar (task three in this case) Its just that the even after setting z index (100000) on the popover component (from slds), it hides under the component either above or below it.(Task Three, Four, Five are in a component, theres another div below them housing other task bars)
The part of the DOM which is inside scroll is limited to its own context. The standard helptext will add DOM element which is fixed (position
fixed) w.r.t the
i or any other element you choose - in effect its just another DOM element.
The only solution I found so far to this is using
title attribute. This adds the popup over the top of DOM by browser. Also if you need to style the title, you can do so by CSS.