lazyLoad
Currently, LazyLoad ( https://msdn.microsoft.com/en-us/ie/dn369270(v=vs.94) ) is implemented in IE and Edge, see support: https://caniuse.com/#feat=lazyload
However there is interest in standardization to enable developers lazy-loading images/iframes and other embedded content (and the proposed lazyLoad's attribute values differ from that of current Edge/IE implementation):
https://github.com/whatwg/html/issues/2806

2 comments
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Anonymous commented
This also has a Feature-Policy https://www.chromestatus.com/feature/5641405942726656
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Anonymous commented
Chrome intent to implement:
https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/czmmZUd4Vww/1-H6j-zdAwAJ