Add placeholder support to old browsers

gistfile1.js

YUI.add('placeholder', function(Y) {

    var VALUE = 'value',
        PLACEHOLDER = 'placeholder',
        elements = {},
        events = [];

    /*
     * The sync method allows you to add additional inputs to the page and then resync the placeholders
     */
    function sync() {
        fetchElements();
        render();
    }

    /*
     * Checks to see if this browser has placeholder
     * support before continuing
     */
    function initializer() {
        if (!placeholderSupport()) {
            sync();
        }
    }

    /*
     * Detaches all of the events attached to input fields from this widget
     *
     * @method destructor
     * @private
     * @since 1.0.0
     */
    function destructor() {
        Y.Array.each(this.events, function(e) {
            e.detach();
        });
    }

    /*
     * Retrieves all of the input elements on the page
     */
    function fetchElements() {
        elements = Y.all('input[type=text]');
    }

    /*
     * Loops through all of the elements and sets
     * the placeholders and events on text inputs
     *
     * @method render
     * @public
     * @since 1.0.0
     */
    function render() {
        elements.each(function(i) {
            if (i.get(VALUE) == "") {
                setPlaceholder(i);
                setEvents(i);
            }
        }, this);
    }

    /*
     * Sets the placeholder value as the value of the input
     *
     * @method setPlaceholder
     * @param element {Node} an input node
     * @public
     * @since 1.0.0
     */
    function setPlaceholder(element) {
        element.set(VALUE, element.getAttribute(PLACEHOLDER));
    }

    /*
     * Adds the event listeners to the input
     *
     * @method setEvents
     * @param element {Node} an input node
     * @public
     * @since 1.0.0
     */
    function setEvents(element) {
        events.push(element.on('focus', function(e) {
            var currentTarget = e.currentTarget;
            if (currentTarget.get(VALUE) == currentTarget.getAttribute(PLACEHOLDER)) {
                currentTarget.set(VALUE, "");
            }
        }));

        events.push(element.on('blur', function(e) {
            if (e.currentTarget.get(VALUE) == "") {
                setPlaceholder(e.currentTarget);
            }
        }, this));
    }

    /*
     * Check if the browser supports placeholders, if it does then do nothing.
     *
     * @method placeholderSupport
     * @public
     * @return {Bool} returns true if supported, false if otherwise
     * @since 1.0.0
     */
    function placeholderSupport() {
        var node = document.createElement('input');
        if (PLACEHOLDER in node) {
            return true;
        }
        return false;
    }

    Y.after('domready', initializer);

    Y.namespace('Placeholder').sync = sync;


}, "1.0.0", {requires: ['event-base', 'node']});