Constant SHARED 

pub const SHARED: &str = "shared";

The topics every page on them shares — what ## Store … shared on "topic" keeps its fields in, keyed <topic>.<field>. A write is a frame the other pages on the topic receive (take_shared_writes); the page that receives one merges it (__lgx_shared), the host never does. Survives a reload and closing the tab: it lives with the topic, not the page.