Sightline
A sightline is the visible width of frame, sash or bar you see between the glass and the wall; slimmer sightlines mean more glass and more view.
When you look at a window from inside, the sightline is the strip of frame you see around the glass. On a sash window it includes the frame and the sash together. A narrow sightline lets the view run edge to edge.
Sightlines depend on the frame material. Steel can hold heavy glass in very narrow profiles. Wood and vinyl need more width. A thin sightline also changes how a mullion looks where two units join. See slim-profile windows for how narrow frames are built, and the slim-profile window entry for the general idea.
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