A number of features are built in to help debugging steppers, which can be used in combination. For example:
HAIBUN_O_WEBPLAYWRIGHT_HEADLESS=false HAIBUN_STAY=failure npm run test
HAIBUN_STAY=failure will leave haibun and any current steppers running after execution.
Another technique, when debugging browser selectors,
is to try the selector in the browser console,
using the built-in $x xpath evaluator (Chrome browsers).