Preparation code

<script>
(function(win){

    'use strict';

    var doc = win.document, simpleRe = /^(#?[\w-]+|\.[\w-.]+)$/, periodRe = /\./g, slice = [].slice;

    win.query = function(selector, context){
        context = context || doc;
        if(simpleRe.test(selector)){
            switch(selector.charAt(0)){
                case '#':
                    return context.getElementById(selector.substr(1));
                case '.':
                    return slice.call(context.getElementsByClassName(selector.substr(1).replace(periodRe, ' ')));
                default:
                    return slice.call(context.getElementsByTagName(selector));
            }
        }
        return slice.call(context.querySelectorAll(selector));
    };
    
})(this);
</script>

<div id="foo" class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
    

Preparation code output

Test runner

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document.querySelectorAll('.item');

query('.item');

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL.

• Revision 4: published Ryan Morr on 2014-10-18
• Revision 5: published Ryan Morr on 2014-10-18
• Revision 6: published Ryan Morr on 2014-10-19
• Revision 7: published Ryan Morr on 2014-10-19
• Revision 12: published Ryan Morr on 2015-3-8
• Revision 13: published on 2015-3-31
• Revision 14: published on 2015-3-31
• Revision 15: published on 2015-4-12
• Revision 16: published Ryan Morr on 2015-4-17
• Revision 17: published on 2015-4-24
• Revision 18: published on 2015-4-25
• Revision 19: published on 2015-4-26
• Revision 20: published on 2015-4-26
• Revision 21: published on 2015-4-27
• Revision 26: published Valerio Mazza on 2018-2-22
• Revision 28: published Valerio Mazza on 2018-2-22
• Revision 29: published Valerio Mazza on 2018-2-22
• Revision 31: published Valerio Mazza on 2018-2-22

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