article component using CSS Grid, Flex, and Native Javascript

When i designed a tooltip, i wanted to understand how to minimalize a code for showing tooltip by Share button. At window.addEventListener i add a condition shareBtn.contains(e.target) instead of e.target.matches('.share-button'). Cause i have into shareButton block img child, and last variant required to add condition for '.share-button img'. Also i struggled with fit the mobile tooltip on whole width and in the bottop of article while used a position: absolute, and i just added top:0px, left: 0px, right: 0px, bottom: 0px; for tooltip to strech it on the parent