1. A method of dynamically resizing a text area in which text is displayed on a display device, comprising: responsive to detecting head movement by a user viewing the displayed text, determining a position where the user focused in the displayed text prior to detecting the head movement and dynamically resizing the text area to use the determined position as a new width for the text area, wherein: detecting the head movement further comprises: tracking positions of the user's head as the user views the displayed text; and comparing the tracked positions of the user's head to determine whether the user's head has moved; and determining the position where the user focused in the displayed text further comprises: tracking positions of the user's eye focus as the user views the displayed text, each tracked position of the user's eye focus associated with one of the tracked positions of the user's head; and responsive to determining that the user's head has moved, determining a particular one of the tracked positions of the user's head which immediately precedes the detected head movement and using, as the determined position where the user focused in the displayed text, the tracked position of the user's eye focus which is associated with the particular one of the tracked positions of the user's head.