input-placeholder-polyfill/dist/main.min.js

A simple polyfill for IE8 and 9 that populates the value when empty

function hidePlaceholderOnFocus(a){target=a.currentTarget?a.currentTarget:a.srcElement,target.value==target.getAttribute("placeholder")&&(target.value="")}function unfocusOnAnElement(a){target=a.currentTarget?a.currentTarget:a.srcElement,""==target.value&&(target.value=target.getAttribute("placeholder"))}if(!("placeholder"in document.createElement("input")))for(var inputs=document.getElementsByTagName("input"),i=0;i<inputs.length;i++)inputs[i].value||(inputs[i].value=inputs[i].getAttribute("placeholder")),inputs[i].addEventListener?(inputs[i].addEventListener("click",hidePlaceholderOnFocus,!1),inputs[i].addEventListener("blur",unfocusOnAnElement,!1)):inputs[i].attachEvent&&(inputs[i].attachEvent("onclick",hidePlaceholderOnFocus),inputs[i].attachEvent("onblur",unfocusOnAnElement));