:input Selector
Description: Selects all input, textarea, select and button elements.
The :input selector basically selects all form controls.
Additional Notes:
Because :input is a jQuery extension and not part of the CSS specification, queries using :input cannot take advantage of the performance boost provided by the native DOM querySelectorAll() method. To achieve the best performance when using :input to select elements, first select the elements using a pure CSS selector, then use .filter(“:input”).
var allInputs = $( ":input" );