It's changed a little since then but yes there is a built in lazyload in the pipeline 😀
This is a draft of spec changes to support a lazyload attribute in iframe and img elements.
/embedded-content.html ( diff )
/iframe-embed-object.html ( diff )
/images.html ( diff )
/index.html ( diff )
/indices.html ( diff )
/infrastructure.html ( diff )
/urls-and-fetching.html ( diff )
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