Visibility Playground

Purpose

The Visibility Playground demonstrates the Browser Lifecycle Visibility module inside the Browser Session Playground.

It teaches developers:

• what page visibility means in browser applications
• how Browser Lifecycle normalizes visibility state
• how page:visible and page:hidden events are ordered and delivered

Route

• /visibility

Architecture

VisibilityPage
  -> useVisibilityPlayground()
    -> createVisibilityPlaygroundSession() in lib/browser-lifecycle.ts
      -> @jayoncode/browser-lifecycle
    -> page:visible / page:hidden listeners
    -> snapshot reads for visibility fields

UI components never attach browser listeners directly. All Browser Lifecycle access stays behind src/lib/browser-lifecycle.ts.

Page Sections

Visibility Status

Shows normalized page visibility state, previous state, last change timestamp, duration since the last transition, and session phase.

Browser API Information

Documents the browser APIs mapped into Browser Lifecycle:

• document.visibilityState
• visibilitychange events

Event Timeline

Records ordered page:visible and page:hidden events with timestamps and metadata for manual QA.

Related Documentation

• Visibility Module
• Session Core
• Events

Interactive Playground

Explore this topic live in the Visibility Playground.