Regarding lazily loading CSS background images, Chromium determines whether
or not to lazily load CSS background images according to the default lazy
loading behavior, and isn't directly controlled by the "loading" attribute.
There are some heuristics involved, e.g. background images inside an iframe
that was itself lazily loaded are loaded eagerly for performance reasons,
but those heuristics are just part of the default lazy loading behavior.

- Scott
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