Fallback for browsers that don't understand placeholder attribute using Modernizr.input test

gistfile1.js

// fallback for browsers that don't understand placeholder attribute
if (!Modernizr.input.placeholder) {

    $("[placeholder]").focus(function() {
        var input = $(this);
        if (input.val() === input.attr("placeholder")) {
            input.val("");
            input.removeClass("placeholder");
        }
    }).blur(function() {
        var input = $(this);
        if (input.val() === "" || input.val() === input.attr("placeholder")) {
            input.addClass("placeholder");
            input.val(input.attr("placeholder"));
        }
    }).blur();
    $("[placeholder]").parents("form").submit(function() {
        $(this).find("[placeholder]").each(function() {
            var input = $(this);
            if (input.val() === input.attr("placeholder")) {
                input.val("");
            }
        });
    });
}