Why might my Elseif Statement fail?

I believe my elseif is formatted correctly but it is failing. I have tried wrapping the elseif in quotes (second == equal statement), adding extra equal signs. Not sure what else I can do.

if (window.location.href.includes("?") && window.location.href.includes("year=") )
        {

        console.log("replace the 4 characters following the equal sign");
        }

        elseif (window.location.href.includes("?") && window.location.href.includes("year=") == "false") 
        {
        console.log("last condition");
        }
        else {
        console.log("end");
        }