Test passages by jumping around in browser?

I know this is a cheat giveaway, but I need to jump to specific passages to see them in my browser rather than Twine's own Test story preview. This is especially important to see how background images look, as those do not show in the Test story window. I'm using Harlowe.

Is this possible? If not, how am I supposed to solve the preview-with-background-image issue -- my game is way too long to play to the points I want to preview. Using save slots sorta works but it's a poor solution. I wish Twine had, test story from this passage in browser...