WIP: demo for in-modal BR iframe, like BWB

[iisa]

[codecov[bot]]

Codecov Report

Merging #644 (16cf3cd) into master (8d9b8ed) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #644   +/-   ##
=======================================
  Coverage   66.69%   66.69%           
=======================================
  Files          35       35           
  Lines        3843     3843           
  Branches      733      733           
=======================================
  Hits         2563     2563           
  Misses       1025     1025           
  Partials      255      255           

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