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.
不到10点，殡仪馆告别厅外已经站满了前来悼念的观众和粉丝，有人胸前佩戴小白花，有人手捧鲜花，一位浙江的网友还托人送来了悼念花圈。
，这一点在heLLoword翻译官方下载中也有详细论述
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Media Source API — MDN Web Docs