Function navigate_on_anchor_click 

pub fn navigate_on_anchor_click(
    clicks: MessageReader<'_, '_, ClickEvent>,
    anchors: Query<'_, '_, &Anchor>,
    host_follows: Option<Res<'_, HostFollowsLinks>>,
)

Declarative navigation: a click on a spawned <a href> navigates the active page. The anchor is a real element; on the web target it is a real DOM <a href>, and under [web] navigation = "soft" the browser’s own anchor navigation is prevented so that this system’s swap is what the click ends at. A host holding HostFollowsLinks follows the link itself, and the click raises nothing here.