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Editorial Team
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Asked: 2026-05-28T08:12:18+00:00

Check this jsfiddle , and have a look at the console. $$ is not

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Check this jsfiddle, and have a look at the console. $$ is not defined. Now, open a completely new window, and enter $$ into a console. It defines a function for getting a (jquery-like) array of all the dom elements which match the selector:

> $$

bound: function () {
  return document.querySelectorAll.apply(document, arguments)
}

Is this being added by Dev tools? It is also present when using Firebug in Firefox. Is it used internally by the tools themselves?

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1 Answer

  1. Editorial Team

    Well, Firebug Lite defines this as:

    this.$$=function(selector,doc){if(doc||!FBL.Firebug.chrome){return FBL.Firebug.Selector(selector,doc)

    (See the source.)

    The full version of Firebug defines this as 

    this.$$ = function(selector)
{
    return FBL.getElementsBySelector(baseWindow.document, selector);
};

    This is actually documented and yes, it is used internally as well.

    So I assume that Google Chrome is doing something similar.

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