Is it feasible for websites to detect which cipher is being used and display a warning banner at the top of the page if SHA1 is used? (Similar to the cookie war

Is it feasible for websites to detect which cipher is being used and display a warning banner at the top of the page if SHA1 is used? (Similar to the cookie warnings most sites are now required to display to US visitors.) Although maybe the precedent of serving content conditional on the cipher used might not be a good one to set.