When are the targeting criteria assessed?

To define when changes should be applied, AB Tasty offers the following option:

When the targeting conditions are met (ajax websites): This option checks at regular intervals (every 16 ms.) if your segmentation criteria are satisfied. You must use this method when your  changes involve elements loaded in AJAX and which are therefore not available to document ready, for example, after a user action or if the item is created by JavaScript call back. If you are in this situation and the element you are trying to change has an ID named "elementID ", you must first add in the targeting options, a criteria type "ID / Class / Element " for which the ID should be the same as "#elementID" and then select the option "Until they Match".