I see the following piece of code
input[type='button']text:visible:enabled:first
What does this code do. Which feature of jquery is this? Is this selector example? Any links to read more on it?
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That exact piece of code is not a valid selector, but if you split them up they are filters and they are used to make a selector.
The others are just filters denoted by the colon.
Reference: http://docs.jquery.com/Selectors