Support cover image heights and positioning changes

[viktorrenkema]

• Sets the new height property on the page cover, set in the app or through md
• Changed the way we set the y position of a page cover to align the app
• Added a shimmer state to better fallback UI while cover is retrieved and avoid the objectPosition shifting from default 50% to whatever value was set.

Demo

CleanShot.2025-10-27.at.10.05.13.mp4

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-j0vu2uip3-gitbook.vercel.app	✅
Cloudflare	https://5ed9c843-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-j0vu2uip3-gitbook.vercel.app/url/gitbook.com/docs	https://5ed9c843-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-j0vu2uip3-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://5ed9c843-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

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Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	👍 Changes approved	32 changed	Oct 27, 2025, 12:43 PM
v2-cloudflare (Inspect)	👍 Changes approved	18 changed	Oct 27, 2025, 12:46 PM
v2-vercel (Inspect)	👍 Changes approved	17 changed	Oct 27, 2025, 12:47 PM

[gregberge]

Can't we do it in CSS only to avoid a client component here?

[viktorrenkema]

Can't we do it in CSS only to avoid a client component here?

I don't think that's reasonably possible as ultimately we are dependent on the page cover's container dimensions which adapt to the viewport in which its rendered. Even if we could make it fully css-based, it'd require rethinking the entire setup and i dont think that's worth spending the time rn.