The best replacement for viewport is screen resolution.

The best alternatives to viewport are rated as following:
★★★★★  screen resolution
★★★★  media query
★★★★  window size
★★★★  scissor
★★  viewbox
★★  window

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No companions for viewport have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of viewport in all years. Click on graph for more.
viewport
screen resolution
media query