W3C (der står bag HTML standarden) skriver følgende på
http://www.w3.org/TR/html4/interact/forms.html#h-17.11 :
17.11 Giving focus to an element
In an HTML document, an element must receive focus from the user in order to become active and perform its tasks. For example, users must activate a link specified by the A element in order to follow the specified link. Similarly, users must give a TEXTAREA focus in order to enter text into it.
There are several ways to give focus to an element:
* Designate the element with a pointing device.
* Navigate from one element to the next with the keyboard. The document's author may define a tabbing order that specifies the order in which elements will receive focus if the user navigates the document with the keyboard (see tabbing navigation). Once selected, an element may be activated by some other key sequence.
* Select an element through an access key (sometimes called "keyboard shortcut" or "keyboard accelerator").
Jeg ved ikke lige hvad de mener med "Designate the element with a pointing device.".. resten siger ikke at det er muligt.. men det siger heller ikke at det er umuligt.. eller noget i den stil.. :-)