Creating popovers

Companion demos for my article, Popover tutorial.

Bare-minimum, markup-only popover
Page with multiple popovers
Using multiple invokers
Using pointerenter and pointerleave
Styling popovers with the :popover-open pseudo-class
Styling popovers with the ::backdrop pseudo-element
Modal versus non-modal ::backdrop behavior
Anchor positioning
Transitions with transition-behavior: allow-discrete