For example, using DECSTBM you could say “set the top margin to line 5 and the bottom margin to line 10, then scroll up 1” - this “scrolls” the region you’ve described by deleting line 5, shifting everything else in the region up by 1 line, and inserting a new line at line 10.
P.S. During the entire time, Twitter blocked any posts containing the engramma.dev domain. Good thing there are many other channels to share.
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Media Source Extensions™ — W3C Working Draft