This feature is experimental. It may be changed or removed in a future version without prior notice or deprecation.
Restores previously saved scroll positions of viewports viewports configured in up.viewport.config.viewports.
up.viewport.config.viewports
Unpoly automatically restores scroll positions when the user presses the back button. You can disable this behavior by setting up.history.config.restoreScroll = false.
up.history.config.restoreScroll = false
If set, only restores viewports that are either an ancestor or descendant of the given element.
A promise that will be fulfilled once scroll positions have been restored.
