This test determines if your page make use of applet tags. Applets, by and large, require specific pplugins to be installed at the browser level. While this may be possible in some instances, and for some device browsers, the majority of plugins are not mobile friendly and their use is strongly discouraged.
Checking for applet tags
This test checks to see if any <applet> element is contained within the page’s markup. If any such applet element is found, then the test reports a FAIL.
If you receive a FAIL for this test, you should consider removing the applets and finding a suitable alternative.
This test is based on a W3C mobileOK best practice. See http://www.w3.org/TR/mobile-bp/ for more details.