We're planning to add functional tests using cypress js.

Speaking of viewers, web browsers come with their own profile viewers. Maybe you could simply piggyback on these.

For Chrome this happens at the chrome://tracing address and the JSON file format it can read is described here.

For Firefox it's in the browser's webdeveloper performance tools or [here]

the documentation and application roles should be handled correctly:

• add documentation as a valid landmark role
• role="documentation" should have a check for it's placement with role="application"