Web Design in a Nutshell, 3rd Edition

Specifying an implementation

The object element is also commonly used with the classid attribute for specifying the implementation, such as an ActiveX control, Java applet, or Python applet. This example shows an object element used to place a Java applet on a page. (Note that some applets require placement with the applet element for proper functionality.)

<objectclassid="java:calendar.class" codetype="application/java"
standby="Calendar loading..." width="200" height="150" title="basic
calendar">...</object>

The Java applet is called with the classid attribute. The optional codetype attribute specifies the content type of the data that will be downloaded by the classid. A browser may use the value of the codetype attribute to avoid downloading information for a content type it does not support. The optional standby attribute provides a message to be displayed while the applet is loading.

Some plug-in media and applets require width and height values in order to play correctly, so be sure to read any documentation provided for your media type. It is good practice to provide width and height measurements for every object element.