Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
|Header type||Response header, Client hint|
|Forbidden header name||no|
|CORS-safelisted response header||no|
DPR client hint is used to select an image the server must specify
Content-DPR in the response. If the value in
Content-DPR is different from the
DPR value in the request (i.e. image DPR is not the same as screen DPR) then the client must use the
Content-DPR for determining intrinsic image size and scaling the image.
Content-DPR header appears more than once in a message the last occurrence is used.
The image device pixel ratio, calculated according to the following formula: Content-DPR = Selected image resource size / (Width / DPR)
DPR header example.
BCD tables only load in the browser