Why are Alt-tab (mouse-over) messages not displayed using Netscape 6.2 and 7.0 browsers?

USPTO has tested Netscape 6.2 and 7.0 browsers and found that Alt-tag message text is not displayed when the user passes the mouse over screen images. Users dependent on Alt-tag text for special applications may not receive a display of message text when using these versions of Netscape .

USPTO FAQ - Questions and Answers (30JUL2004)