Can you explain the concept behind using a tagging system similar to Stack Overflow? Specifically, I am interested in the front-end implementation. Are there any specific libraries that offer features such as auto-complete and tag separation, similar to what is used on Stack Overflow or Pivotal Tracker?
For starting with multiple values, consider using jQuery UI autocomplete. You can find the necessary documentation for this feature on their official website. I have personally utilized this plugin in various projects, including creating a tagging user interface.
In order to handle the selected values, you will need to implement a suitable AJAX handler. Since your query pertains to front-end development, I'll assume that you are already equipped with the required back-end data structures.
https://github.com/aehlke/tag-it
Looks like a promising beginning, offering autocomplete functionality with hardcoded or ajax options (as well as other cool features), along with plenty of attractive front-end design elements.
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