Add fetchpriority prop to YouTube component

[AoSankaku]

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[delucis]

Thanks for the PR @AoSankaku. How did you test this? As far as I can tell this PR adds a fetchpriority attribute to the custom element, but this is doesn’t actually do anything?

[AoSankaku]

@delucis Thanks for your comment, and actually, as you considered, this doesn't do anything and won't remove LCP request discovery warning in pagespeed insignts. So I added actual prefetch element for better fix. This removes LCP request discovery at least on my website.

My personal website uses the exact same patched version of this PR, so you can check it on yourself.

This is the result for non-patched version:
https://pagespeed.web.dev/analysis/https-a5ec86bd-aosankaku-website-2025-pages-dev/k194mwazrb?form_factor=mobile

This exists.

And the patched version is this:

https://pagespeed.web.dev/analysis/https-9bb8f79e-aosankaku-website-2025-pages-dev/cq3vfi48ea?form_factor=mobile

"LCP request discovery" warning is gone as you can see.

And the diff is here:

AoSankaku/aosankaku-website-2025@f6c417a