Barry Pollard

Oh I missed that this was being added to images.js, I presumed it was for performance.js. Oops. OK seems fine in images.js (unless easy to add to responsive_images.js). Ideally we'd...

> Fair point. It isn't clear on https://github.com/w3c/largest-contentful-paint/issues/86 whether it is calculated on encoded or decoded body size. I would imagine it's decoded size. > Other tools (for example https://www.phpied.com/quick-bpp-image-entropy-check/)...

@max-ostapenko @bstandaert-wustl what's the latest on this? We need to merge this today if we want to include it in the Web Almanac 2024.

Got merge conflicts now @max-ostapenko . Can you resolve?

> In [performance.js](https://github.com/HTTPArchive/custom-metrics/blob/1453b36b96cbb1773aa362d86d90c4d59b28964d/dist/performance.js#L327-L335) we're capturing the speculation rules themselves. This tells us how the links should be prefetched/prerendered, but not which ones actually are. > > Add new metadata to...

Well 1) it's not supported on WebPageTest. Even if it was I'm not sure if it would be observable as it happens in a separate rendering process (you can't see...

> Testing prerendering in a lab environment seems like a valid use case, so maybe it's safe to assume that it'll be supported in WPT at some point? I think...

You'd also need to take into account the `eagerness` setting. And the chrome limits.

Yeah but maybe a waaaaaay upper limit so not sure what it tells us? For example, if wikipedia implemented this with document rules and set `eagerness` to `moderate` or `conservative`...

Most of this already exists in the almanac custom metric: https://github.com/HTTPArchive/custom-metrics/blob/main/metric-summary.md#iframes We should enhance that. Though maybe there’s a good argument to move it to its own file while doing...