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by thedufer 4472 days ago
Looking at it in the console, it looks like $ returns a single DOM element and $$ returns a NodeList (array-like object) of DOM elements. Not sure what library that is.
2 comments
reubenmorais 4472 days ago
No library, at least in Firefox it's defined by devtools and only works in the console (provided the page doesn't have it's own $ and $$ globals).

[0] http://dxr.mozilla.org/mozilla-central/source/toolkit/devtoo...

[1] http://dxr.mozilla.org/mozilla-central/source/toolkit/devtoo...

Edit: It works in the WebKit devtools too:

[0] https://mxr.mozilla.org/chromium/source/src/third_party/WebK...

link
scrabble 4472 days ago
PrototypeJS works that way.
link