UX: tags behaviour

As a user I confused with the meaning of tags under the search box: was the search done by selected tags or not? I'd like to have a search that is intuitive and doesn't blot up the screen with lots of elements

Acceptance Criteria:

• Tags searchbox is located to the left from the list of articles. No buttons are present.
• When tag is chosen from the dropdown
  • It appears under the search box, each new tag is located under previous one.
  • Search happens instantly, without Find button.
  • Articles that were found have all their tags listed - those of the tags that we searched for should be highlighted. In this way user will be more sure that he actually searched for tags even after a 30 mins coffee-break.
• Each tag in the search field should have X button (Remove). After pressing it, the tag gets removed from the search box and new search happens instantly.
• Tags should look similar on Article Editing/Creating pages. There is also should be a border and X button.