Loading

Type	String, Symbol
Available options	"async" or "preload"
Default	"async"

Determines how popover is loaded. By default, with "async" option, popover is fetched on server when required.

When option is set to "preload" the popover will be generated during page load and inserted in a <template> element, with the class .popover-content, within the <coup-doeil> element.