// [string] CSS value of the background image size. Defaults to none.
// background_size = ""
// [string] CSS value of the background image position.
// For example:
// "10% 10% center"
// background_position = ""
// [bool] If true, the backspace should send BS ('\x08', aka ^H). Otherwise the backspace key should send '\x7f'.
// backspace_sends_backspace = false
// [map[string]map[string]string]
// A nested map where each property is the character set code and the value is a map that is a sparse array itself. In that sparse array, each property is the received character and the value is the displayed character.
// For example:
// {"0" = {"+" = "\u2192"
// "," = "\u2190"
// "-" = "\u2191"
// "." = "\u2193"
// "0" = "\u2588"}}
// character_map_overrides = null
// [bool] Whether or not to close the window when the command exits.
// close_on_exit = true
// [bool] Whether or not to blink the cursor by default.
// cursor_blink = false
// [2[int]] The cursor blink rate in milliseconds.
// A two element array, the first of which is how long the cursor should be on, second is how long it should be off.
// cursor_blink_cycle = [1000, 500]
// [string] The color of the visible cursor.
// cursor_color = "rgba(255, 0, 0, 0.5)"
// [[]string]
// Override colors in the default palette.
// This can be specified as an array or an object.
// Values can be specified as almost any css color value.
// This includes #RGB, #RRGGBB, rgb(...), rgba(...), and any color names that are also part of the stock X11 rgb.txt file.
// You can use 'null' to specify that the default value should be not be changed.
// This is useful for skipping a small number of indicies when the value is specified as an array.
// color_palette_overrides = null
// [bool] Automatically copy mouse selection to the clipboard.
// copy_on_select = true
// [bool] Whether to use the default window copy behaviour
// use_default_window_copy = false
// [bool] Whether to clear the selection after copying.
// clear_selection_after_copy = true
// [bool] If true, Ctrl-Plus/Minus/Zero controls zoom.
// If false, Ctrl-Shift-Plus/Minus/Zero controls zoom, Ctrl-Minus sends ^_, Ctrl-Plus/Zero do nothing.
// ctrl_plus_minus_zero_zoom = true
// [bool] Ctrl+C copies if true, send ^C to host if false.
// Ctrl+Shift+C sends ^C to host if true, copies if false.
// ctrl_c_copy = false
// [bool] Ctrl+V pastes if true, send ^V to host if false.
// Ctrl+Shift+V sends ^V to host if true, pastes if false.
// ctrl_v_paste = false
// [bool] Set whether East Asian Ambiguous characters have two column width.
// east_asian_ambiguous_as_two_column = false
// [bool] True to enable 8-bit control characters, false to ignore them.
// We'll respect the two-byte versions of these control characters regardless of this setting.
// enable_8_bit_control = false
// [enum(null, true, false)]
// True if we should use bold weight font for text with the bold/bright attribute.
// False to use the normal weight font.
// Null to autodetect.
// enable_bold = null
// [bool] True if we should use bright colors (8-15 on a 16 color palette) for any text with the bold attribute.
// False otherwise.
// enable_bold_as_bright = true
// [bool] Show a message in the terminal when the host writes to the clipboard.
// enable_clipboard_notice = true
// [bool] Allow the host to write directly to the system clipboard.
// enable_clipboard_write = true
// [bool] Respect the host's attempt to change the cursor blink status using DEC Private Mode 12.
// enable_dec12 = false
// [map[string]string] The default environment variables, as an object.
// environment = {"TERM" = "xterm-256color"}
// [string] Default font family for the terminal text.
// [string] The foreground color for text with no other color attributes.
// foreground_color = "rgb(240, 240, 240)"
// [bool] If true, home/end will control the terminal scrollbar and shift home/end will send the VT keycodes. If false then home/end sends VT codes and shift home/end scrolls.
// home_keys_scroll = false
// [map[string]string]
// A map of key sequence to key actions.
// Key sequences include zero or more modifier keys followed by a key code.
// Key codes can be decimal or hexadecimal numbers, or a key identifier.
// Key actions can be specified a string to send to the host, or an action identifier.
// For a full list of key code and action identifiers, see https://goo.gl/8AoD09.
// Sample keybindings:
// {"Ctrl-Alt-K" = "clearScrollback"
// "Ctrl-Shift-L"= "PASS"
// "Ctrl-H" = "'HELLO\n'"}
// keybindings = null
// [int] Max length of a DCS, OSC, PM, or APS sequence before we give up and ignore the code.
// max_string_sequence = 100000
// [bool] If true, convert media keys to their Fkey equivalent.
// If false, let the browser handle the keys.
// media_keys_are_fkeys = false
// [bool] Set whether the meta key sends a leading escape or not.
// meta_sends_escape = true
// [enum(null, 0, 1, 2, 3, 4, 5, 6]
// Mouse paste button, or null to autodetect.
// For autodetect, we'll try to enable middle button paste for non-X11 platforms.
// On X11 we move it to button 3.
// mouse_paste_button = null
// [bool] If true, page up/down will control the terminal scrollbar and shift page up/down will send the VT keycodes.
// If false then page up/down sends VT codes and shift page up/down scrolls.
// page_keys_scroll = false
// [enum(null, true, false)]
// Set whether we should pass Alt-1..9 to the browser.
// This is handy when running hterm in a browser tab, so that you don't lose Chrome's "switch to tab" keyboard accelerators. When not running in a tab it's better to send these keys to the host so they can be used in vim or emacs.
// If true, Alt-1..9 will be handled by the browser.
// If false, Alt-1..9 will be sent to the host.
// If null, autodetect based on browser platform and window type.
// pass_alt_number = null
// [enum(null, true, false)]
// Set whether we should pass Ctrl-1..9 to the browser.
// This is handy when running hterm in a browser tab, so that you don't lose Chrome's "switch to tab" keyboard accelerators. When not running in a tab it's better to send these keys to the host so they can be used in vim or emacs.
// If true, Ctrl-1..9 will be handled by the browser.
// If false, Ctrl-1..9 will be sent to the host.
// If null, autodetect based on browser platform and window type.
// pass_ctrl_number = null
// [enum(null, true, false)]
// Set whether we should pass Meta-1..9 to the browser.
// This is handy when running hterm in a browser tab, so that you don't lose Chrome's "switch to tab" keyboard accelerators. When not running in a tab it's better to send these keys to the host so they can be used in vim or emacs.
// If true, Meta-1..9 will be handled by the browser.
// If false, Meta-1..9 will be sent to the host. If null, autodetect based on browser platform and window type.
// pass_meta_number = null
// [bool] Set whether meta-V gets passed to host.
// pass_meta_v = true
// [bool] If true, scroll to the bottom on any keystroke.
// scroll_on_keystroke = true
// [bool] If true, scroll to the bottom on terminal output.
// scroll_on_output = false
// [bool] The vertical scrollbar mode.
// scrollbar_visible = true
// [int] The multiplier for the pixel delta in mousewheel event caused by the scroll wheel. Alters how fast the page scrolls.
// scroll_wheel_move_multiplier = 1
// [bool] Shift + Insert pastes if true, sent to host if false.
// shift_insert_paste = true
// [string] URL of user stylesheet to include in the terminal document.
