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Creating a Progressive Web App (PWA) to store contact details from a form and submit them when internet access is available involves a combination of technologies like HTML, CSS, JavaScript, and service workers. Below is a simplified example of how you can achieve this:

HTML Form: Create an HTML form to collect contact details. You can create an index.html file.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

	/* eslint-disable no-console, import/first */
	import path from 'path';
	import express from 'express';
	import expressStaticGzip from 'express-static-gzip';
	import graphqlHTTP from 'express-graphql';
	import PrettyError from 'pretty-error';
	import bodyParser from 'body-parser';
	import raven from 'raven';
	import morgan from 'morgan';
	import { graphqlBatchHTTPWrapper } from 'react-relay-network-layer';

	const reduce = function(callback) {
	'use strict';
	if (this == null) {
	throw new TypeError('Array.prototype.reduce called on null or undefined');
	}

	if (typeof callback !== 'function') {
	throw new TypeError(callback + ' is not a function');
	}

	// Includes functions for exporting active sheet or all sheets as JSON object (also Python object syntax compatible).
	// Tweak the makePrettyJSON_ function to customize what kind of JSON to export.

	var FORMAT_ONELINE = 'One-line';
	var FORMAT_MULTILINE = 'Multi-line';
	var FORMAT_PRETTY = 'Pretty';

	var LANGUAGE_JS = 'JavaScript';
	var LANGUAGE_PYTHON = 'Python';

	// Use Gists to store code you would like to remember later on
	console.log(window); // log the "window" object to the console