https://note.com/usutani/n/nb00df58a9966

renderPage.pu

@startuml renderPage
hide footbox

note over PageView: renderPage
create PageRenderer
PageView -> PageRenderer: new
PageView -> PageView: render

PageView -> PageRenderer: isPreview, shouldRender, newSnapshot

PageView -> PageView: prepareToRenderSnapshot
PageView -> PageView: markAsPreview
PageView -> PageRenderer: prepareToRender

PageRenderer -> PageRenderer: mergeHead
PageRenderer -> PageRenderer: copyNewHeadStylesheetElements
PageRenderer -> PageRenderer: copyNewHeadScriptElements
PageRenderer -> PageRenderer: removeCurrentHeadProvisionalElements
PageRenderer -> PageRenderer: copyNewHeadProvisionalElements

PageView -> PageView: resolveInterceptionPromise
PageView -> Session: allowsImmediateRender
Session -> Session: notifyApplicationBeforeRender

PageView -> PageView: renderSnapshot
PageView -> PageRenderer: render
PageRenderer -> PageRenderer: replaceBody
create Bardo
PageRenderer -> Bardo: preservingPermanentElements
Bardo -> Bardo: enter
Bardo -> PageRenderer: callback
PageRenderer -> PageRenderer: activateNewBody
PageRenderer -> PageRenderer: assignNewBody
Bardo -> Bardo: leave
destroy Bardo

PageView -> Session: viewRenderedSnapshot
Session -> History: location
Session -> Session: notifyApplicationAfterRender

PageView -> PageView: finishRenderingSnapshot
PageView -> PageRenderer: finishRendering
PageRenderer -> PageRenderer: focusFirstAutofocusableElement

PageView -> PageRenderer: delete
destroy PageRenderer
@enduml