The opening paragraph has one short sentence per step, and the header
check names `/` and `/no-such-page`. The checks section no longer says
every check runs at every width: `tap-targets-44px` runs only at touch
widths, and each width gets one of the two row-layout checks. The wait
for 5 latency figures is described per width, as the test opens the page
once per width. For #197, part of
#189.
Model: fable-5-1
