How to debug the code if UIs are not shown?


The last code exercise in Routing III, to show the information of details in photo.html, the test is passed in light green, but from the webpage I didn't see any detail displayed, also unlike screenshot in other thread, the detail image is an icon, not expanded.

In other code exercises, I can't figure out which part has gone wrong, so I often visit the discussion board to search for how to resolve similar problem, it seems more like a undecent cheat.

I am new to javascript programming and web front technologies, what's the best practice for finding the leaky ends? Any hint will be appreciated! Sincerely!


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