UD5 Toolkit
Reporting API Demo - Online See CSP & Deprecation Reports
Send a test CSP violation report and see the ReportingObserver in action. Understand how monitoring works.
Tag: User Activity Monitoring
7+ toolsARIA Live Region Monitor - Online See Dynamic Announcements
Watch for updates to aria‑live regions and log what a screen reader would announce. Debug live regions.
Simple Uptime Monitor - Online Check Website Status from Your Browser
Enter a URL and click to check if it's reachable from your browser (CORS-limited, uses no-cors fetch). Quick manual test. Local only.
Scroll Position Monitor - Online Live Scroll Top/Left
See a live readout of window scrollX and scrollY. Visualize scroll direction. For debugging sticky navs.
Element Resize Detector - Online Monitor Size Changes
Select any element on the test page and monitor its size changes with ResizeObserver. See log of all entries.
Web MIDI Monitor - Online View Raw MIDI Messages
Connect a MIDI controller and see every message in a log. Filter by channel and type. Essential for debugging music apps.
Idle Detection API Demo - Online User Activity Monitor
Request permission and detect when the user is idle (away from keyboard). See screen lock state. For native‑like apps.