onFocus This event handler will execute the instruction(s) when the object it has been assigned to is 'focused on'. For example, when a cell of a table has been made active by either clicking on it or tabbing to it, you've satisfied its 'focus'. That is, the cell has become the 'focus' of attention. syntax: document.onFocus = function() The onFocus Event Handler is used with the following: A APPLET AREA BUTTON CAPTION DIV EMBED FIELDSET IMG LEGEND MARQUEE OBJECT TABLE TEXTAREA button checkbox fileUpload layer password radio reset submit text window