acaart

<?php // encoding: utf-8

/*Copyright 2008Qian Qin(email : mail@qianqin.de)

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,

acaart

// https://codepen.io/cmykw/pen/gemxJm

// layout
<nav/>

// style
<style>
  body { min-height: 200vh; }

  nav {

acaart

http://apassant.net/2012/01/16/timeout-for-html5-localstorage/

var hours = 24; // Reset when storage is more than 24hours
var now = new Date().getTime();
var setupTime = localStorage.getItem('setupTime');
if (setupTime == null) {
    localStorage.setItem('setupTime', now)
} else {
    if(now-setupTime > hours*60*60*1000) {
        localStorage.clear()