Lynx invokes a built-in Line Editor for entering strings in response to prompts, in forms, and for email messages if an external editor has not been defined. Additional alternative key-bindings can be offered by configuring with --enable-alt-bindings or by adding them in LYEditmap.c before compiling Lynx. If available, they may be selected via the 'o'ptions menu, or by editing lineedit_mode in the '.lynxrc' file.
Note: setting emacs/vi keys ON has no direct effect on line-editor bindings.
This is the Alternative Binding keymap:
ENTER Input complete - RETURN TAB Input complete - TAB, Do ABORT Input cancelled - Ctrl-G, Ctrl-O, (Ctrl-C on some systems) ERASE Erase the line - Ctrl-U BACK Cursor back char - Left-Arrow, Ctrl-B FORW Cursor forward char - Right-Arrow, Ctrl-F BACKW Cursor back word - Ctrl-P FORWW Cursor forward word - Ctrl-N BOL Go to begin of line - Ctrl-A, Home, Find EOL Go to end of line - Ctrl-E, End, Select DELP Delete prev char - Ctrl-H, DELETE, Remove DELN Delete next  char - Ctrl-D DELPW Delete prev word - Ctrl-R DELNW Delete next word - Ctrl-T DELEL Delete to end of line - Ctrl-K UPPER Upper case the line - Ctrl-^ LOWER Lower case the line - Ctrl-_ LKCMD Invoke cmd prompt - Ctrl-V (in form text fields, only)  Special commands for use only in textarea fields: Textarea external edit - Ctrl-X e Insert file in textarea - Ctrl-X i Grow textarea - Ctrl-X g  "next" means the character "under" a box or underline style cursor; it means "to the immediate right of" an I-beam (between characters) type cursor.  Follow Ctrl-V with any recognised key command, to "escape" from a text input field.  For other key combinations using Ctrl-X as a prefix key, see the Help page for the Bash-Like Binding.