lots more sequences

docs/sequences/hts.md

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+# Horizontal Tab Set
+
+|     |   |
+| --- | --- |
+| Text | `ESC H`     |
+| Hex  | `0x18 0x48` |
+
+Mark the current cursor colum as a tab stop.

docs/sequences/ind.md

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+# Index
+
+|     |   |
+| --- | --- |
+| Text | `ESC D`     |
+| Hex  | `0x18 0x44` |
+
+Move the cursor to the next line in the scrolling region, scrolling
+if necessary. This always unsets the pending wrap state.
+
+If the cursor is currently outside the scrolling region:
+
+  * move the cursor down one line if it is not on bottom line of the screen.
+
+If the cursor is inside the scrolling region:
+
+  * If the cursor is on the bottom-most line of the screen: invoke
+    [scroll up](su.md) with the value `1`.
+  * Else: move the cursor one line down.

docs/sequences/nel.md

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+# Index
+
+|     |   |
+| --- | --- |
+| Text | `ESC E`     |
+| Hex  | `0x18 0x45` |
+
+Invoke [carriage return](cr.md) and then [index](ind.md).

docs/sequences/ri.md

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+# Reverse Index
+
+|     |   |
+| --- | --- |
+| Text | `ESC M`     |
+| Hex  | `0x18 0x4D` |
+
+Reverse [index](ind.md). This unsets the pending wrap state.
+
+If the cursor is outside of the scrolling region:
+
+  * move the cursor one line up unless it is the top-most line of the screen.
+
+If the cursor is inside the scrolling region:
+
+  * If the cursor is on the top-most line: invoke [scroll down](#) with value `1`
+  * Else: move the cursor one line up.
+
+## TODO
+
+  * Scroll region edge cases