Test page
Check your work against the conformance tests. Everything runs in this browser with the same checker you can download, and talks only to the address you give it, exactly as a browser-based producer does. Reaching your receiver at all proves it answers browsers.
What to check Your receiver’s address, probed and then sent every example and fixture.
This sends messages to your receiver
The probe, then 8 examples and the conformance fixtures, go to the address below
and will show on its board. Use a test board, not one a crowd is watching.
Use Chrome, and allow its prompt
This page is https and your receiver is plain http on your network. Chrome asks once whether
this site may reach devices on your local network: choose Allow. Safari and Firefox do not let
an https page reach a plain http receiver. If you blocked it, allow local network access for
this site in the address bar and run the checks again.