The `srcset` attribute enables authors to adapt image resources to the device's
This intent refers to the DPR switching parts (the 'x' qualifier), which have rough consensus around them.
New device form factors and screen DPRs are added to the market on a regular basis. Serving the same image resources to all devices (which may display them in differing dimensions and at different DPRs) is wasteful, and hurts Web performance.
This feature will start resolving this problem, by enabling Web authors to specify multiple resources, with varying DPR qualities, and let the browser pick the resource that matches the device's capabilities.
This feature is identical to the feature that landed in WebKit recently (The CL is a port of the WebKit code). It is not yet implemented in IE or Firefox.
The feature's syntax include an inherent fallback mechanism for authors, where non-supporting browsers will simply fetch the resource specified in the `src` attribute. (resulting in a sub-optimal, but fully-functional image)
Ongoing technical constraints
Link to “Intent to Implement” blink-dev discussion