1. A computer-implemented method, comprising: receiving, at a user device, user input entered into a search engine query input field by a user; while receiving the user input and prior to submitting the user input as a search request: receiving, at the user device and from an answer box presentation system, an answer box that includes content associated with a particular input-answer box pair, the particular input-answer box pair associated with a text input and an answer box, wherein the particular input-answer box pair is selected from one or more candidate input-answer box pairs based on a presentation value for each candidate pair, wherein each of the one or more candidate input-answer box pairs are identified from a plurality of input-answer box pairs based on the text input for each of the one or more candidate input-answer box pairs matching the user input, wherein the text input for each of the plurality of input-answer box pairs is associated with the respective answer box if the respective answer box was presented by a search engine in response to a query beginning with an input matching the text input, and wherein the presentation value for each input-answer box pair for each of the plurality of input-answer box pairs is derived from a number of times the answer box in the pair was presented by the search engine in response to queries beginning with the input matching the text input in the pair, and wherein the content of the answer box of each input-answer box pair of the plurality of input-answer box pairs includes a summary of information that is determined to be responsive to a query beginning with an input matching the text input, and is different from the query and query suggestions for the query; and presenting the answer box for display to the user at the user device.