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, thanks for the clarification! Are there plans to better specify CSS background images lazy loading?
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