Feature Description

When a video is the LCP element and it has a poster image, we should prioritize the loading of that poster image with a fetchpriority=high preload link. This would be a simple addition to the existing logic that does the same for an img or background-image which is the LCP element.

This can be done as part of the Image Prioritizer plugin. See #1088.

Aside: if there is no poster, should an LCP video element also preload the video URL as well?