Cookie Priority attribute

While Google has made strides toward removing cookies, this new feature was recently added in Chrome 81+ in what appears to be a method for developers to better manage cookie lifespans when the browser client limit is being reached. This value can be seen in the DevTools, it appears that some cookies can be elevated even when the attribute is not specified.

This is added to the cookie string like any other attribute with value:
;Priority=High;

NOTE: this appears to be implemented only in Google Chrome.

References