Cross-Lib accessible outline removal

Outliner.js

/*!
Copyright (c) <2012> <Arieh Glazer>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

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*/

//Accessible outline removal
//can be used with delegation or on specific elements (by query)
//should work on all modern browsers + IE8+

//method inspired by:http://www.paciellogroup.com/blog/2012/04/how-to-remove-css-outlines-in-an-accessible-manner/

//example: http://jsfiddle.net/JzEyP/8/
(function() {
    function hasClass(el, name) {
        if ('classList' in el) return el.classList.contains(name);
        return el.className.explode(' ').indexOf(name) > -1;
    }

    this.Outliner = function Outliner(opts) {
        var key;
        for (key in opts) if (key in this.options) this.options[key] = opts[key];

        this.handleEvent = this.handleEvent.bind(this);

        if (this.options.useDelegation) this.className = this.options.selector.replace('.', '');

        this.generate();
        this.attach();
    };

    Outliner.prototype = {
        constructor: Outliner,
        options: {
            selector: 'a',
            useDelegation: false
        },
        generate: function() {
            this.element = document.createElement('style');
            document.head.appendChild(this.element);
        },
        handleEvent: function(e) {
            if (this.options.useDelegation && hasClass(e.target, this.className) == false) return;

            switch (e.type) {
            case 'mouseover':
                this.removeOutline();
                break;
            case 'keydown':
                this.restoreOutline();
                break;
            }
        },

        attach: function() {
            var compat = 'addEventListener' in document,
                attachee = compat ? this : this.handleEvent,
                key_ev = compat ? 'keydown' : 'onkeydown',
                mouse_ev = compat ? 'mouseover' : 'onmouseover',
                i, el;

            this.elements = this.options.useDelegation ?
                [document.body] :
                document.querySelectorAll(this.options.selector);

            for (i = 0; el = this.elements[i]; i++) {
                el[compat ? 'addEventListener' : 'attachEvent'](key_ev, attachee, false);
                el[compat ? 'addEventListener' : 'attachEvent'](mouse_ev, attachee, false);
            }
        },
        removeOutline: function() {
            this.element.innerHTML = this.options.selector + ' {outline:none}';
        },
        restoreOutline: function() {
            this.element.innerHTML = '';
        },
        detach: function() {
            var compat = 'addEventListener' in document,
                attachee = compat ? this : this.handleEvent,
                key_ev = compat ? 'keydown' : 'onkeydown',
                mouse_ev = compat ? 'mouseover' : 'onmouseover',
                i, el;

            for (i = 0; el = this.elements[i]; i++) {
                el[compat ? 'removeEventListener' : 'detatchEvent'](key_ev, attachee, false);
                el[compat ? 'removeEventListener' : 'detatchEvent'](mouse_ev, attachee, false);
            }

            this.elements = {};

            document.head.removeElement(this.element);
            this.element = null;
        }
    };

}).call(this);

new this.Outliner({
    useDelegation: 'true',
    selector: '.use'
});

Do we really need a library to achieve this? And is detecting mouse movement the best approach? What if a user uses both mouse and keyboard?
This is how I do it in my projects:

1. By default I disable outline with this css declaration:
   body:not(.accesibility) a{
   outline:none!important;
   }
2. If I detect the use of the TAB key (this catches the user intention to navigate via keybord), I add the "accesibility" class to the body via a simple JS function:
   $(document).keyup(function(e) {
   if (e.keyCode === 9) {// tab
   $("body").addClass("accesibility");
   }
   });
   This invalidates the CSS rule.

Do we really need a library to achieve this? And is detecting mouse movement the best approach? What if a user uses both mouse and keyboard?
This is how I do it in my projects:

1. By default I disable outline with this css declaration:
   body:not(.accesibility) a{
   outline:none!important;
   }
2. If I detect the use of the TAB key (this catches the user intention to navigate via keybord), I add the "accesibility" class to the body via a simple JS function:
   $(document).keyup(function(e) {
   if (e.keyCode === 9) {// tab
   $("body").addClass("accesibility");
   }
   });
   This invalidates the CSS rule.
   Your solution works anly once; After click on TAB key the original problem remains!