demo · v132

Many invokers, no anchor-names — menu per row

Each row has its own “...” button with a popovertarget. Pre-132 you'd need a unique anchor-name on every button to anchor each menu correctly; v132 makes the invoker itself the implicit anchor. Same popover element template for every row.

checking position-area + implicit invoker anchoring…

the trick

<button popovertarget="m1">...</button>
<div id="m1" popover>...</div>

[popover] {
  position-anchor: auto;           /* invoker = implicit anchor (v132+) */
  position-area: bottom span-right;
}

see also