'principal'

<!DOCTYPE html SYSTEM "http://www.yoyodesign.org/dtd/xhtml1-transitional-custom.dtd">

This page contains a Quicktime™ movie, specified using the opposite XHTML code. The non-standard part is shown with a different style.

<object classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B"
    codebase="http://www.apple.com/qtactivex/qtplugin.cab"
    width="128" height="79">
        <param name="src" value="yoyo.mov" />
        <param name="autoplay" value="true" />
        <param name="controller" value="false" />
        <param name="loop" value="palindrome" />
        <embed src="yoyo.mov" width="128" height="79"
            autoplay="true" controller="false" loop="palindrome"
            pluginspage="http://www.apple.com/quicktime/download/">
        </embed>
</object>