i see a page http://input.mozilla.com/en-US/feedback#happy from mozilla and i found something special their.
page not refresh if back or forward press after fill form and later page load.
they show them by animating. can someone show me the code look like that or similar with the example.
This is done using CSS transitions (for animating the dialogs etc.) and history push / popstates.
See:
https://github.com/mozilla/input.mozilla.org/blob/master/media/js/feedback.js#L9
and
https://github.com/mozilla/input.mozilla.org/blob/master/media/css/feedback.css#L43