Minecraft wiki entry for title, associated text: ... clear
Clears the screen title from the screens of the specified player(s).
... reset
Resets the subtitle text for the specified player(s) to blank text, and the fade-in, stay and fade-out times to their default values (defaults to 10 gt, 70 gt, and 20 gt).
... subtitle ...
If a screen title is currently being displayed to the specified player(s), changes the current subtitle to the specified text; otherwise, specifies the subtitle for the next screen title to be displayed to the specified player(s).
... title ...
Displays a screen title to the specified player(s), or changes the current screen title to the specified text. After fading out, resets the subtitle back to blank text, but does not reset fade-in, stay, and fade-out times.
... actionbar ...
Displays text on the action bar to the specified player(s), or changes the current action bar title.
... times ...
Changes the fade-in, stay, and fade-out times (measured in game ticks) of all current and future screen titles for the specified player(s).