The jet of S5 0716+71 at $\mu$as scales with RadioAstron
  Ground-space interferometer RadioAstron provides unique opportunity to probe
detail structure of the distant active galactic nuclei at $\mu$as scales. Here
we report on RadioAstron observations of the BL Lac object S5 0716$+$71,
performed in a framework of the AGN Polarization and Survey Key Science
Programs at 22 GHz during 2012-2018. We obtained the highest angular resolution
image of the source to date, at $57\times24 \mu$as. It reveals complex
structure of the blazar jet in the inner 100 $\mu$as, with emission regions
that can be responsible for the blazar variability at timescales of a few days
to week. Linear polarization is detected in the core and jet areas at the
projected baselines up to about $5.6$ Earth diameters. The observed core
brightness temperature in the source frame of $\geq2.2\times10^{13}$ K is in
excess of theoretical limits, suggesting the physical conditions are far from
the equipartition between relativistic particles and magnetic field.
