A hieroglyphic editor

The <jsesh-editor> element of @jsesh/editor, with the <jsesh-palette> of @jsesh/palette in a side panel. The page only adds a toolbar and a status line: they use the element's commands and its jsesh-change event. Click in the frame, and type as in JSesh.

Code: Separator:

The text in MdC

The text as the editor writes it; it can be edited here too.

Keys

Sign codes (A1, nfr, p...) are completed by a separator: -, Space or Enter puts the sign in a new quadrat; :, * and & group it with the next one. So p:tSpace stacks p over t.
!: new line. Backspace, Delete: erase. Esc: forget the code.
Arrows, Home, End move the cursor; with Shift, or a shift-click, they select.
Ctrl/⌘ + Z: undo; with Shift: redo. Ctrl/⌘ + A: select all.