Add Mx bookmarklet

[ryancdotorg]

If one creates a bookmark to the following address

javascript:(D=>{D.querySelectorAll("option[value^=mrs i]").forEach(N=>{for(var r=D.createElement("option"),p=N.parentNode,o=p.children,t=0;t<o.length;++t)if(/^mx/i.test(o[t].value))return o[t].selected=!0;r.value=r.innerText=N.value.replace(/rs/i,s=>"R"==s[0]?"X":"x"),p.appendChild(r),r.selected=!0})})(document)

for many forms, an Mx option can be added simply by clicking on the bookmark while the form is open. This is known as a "bookmarklet".