Some preload tests assume preloads that are not specified #56936
Description
https://wpt.fyi/results/preload/preload-with-type.html?label=master&label=experimental&aligned&q=%2Fpreload%2F
https://wpt.fyi/results/preload/onerror-event.html?label=master&label=experimental&aligned&q=%2Fpreload%2F
https://wpt.fyi/results/preload/onload-event.html?label=master&label=experimental&aligned&q=%2Fpreload%2F
These all involve video and audio preloads, which are not part of the specification and make the tests fail in every browser.