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// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// http://creativecommons.org/publicdomain/zero/1.0/

/*
This function takes two arguments:
element: a reference to a DOM node in the document e.g. a button.
feedbackContent: a string of text or HTML.

An example of usage would be:
document.querySelector('button').addEventListener('click', function() {

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// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// http://creativecommons.org/publicdomain/zero/1.0/

/* Use <button type="share"> in your HTML.
Include this JavaScript in a <script> element on the same page or in an external script.
The script checks for three ways of sharing:
1. Native support for <button type="share">.
2. Support for the JavaScript Web Share API.
3. A mailto: link.
This will share the current URL and page title.

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// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// http://creativecommons.org/publicdomain/zero/1.0/

(function (win, doc) {
    'use strict';
    // Cut the mustard
    if (!doc.querySelectorAll || !doc.querySelectorAll('input[list]') || !win.HTMLDataListElement || !win.addEventListener){
        return;
    }
    // Loop through each input element with a list attribute

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<?php

function getEmbedCode($url="") {

    $return = '';

    $providers = array(
        'flickr.com'        =>    'https://www.flickr.com/services/oembed/',
        'huffduffer.com'    =>    'https://huffduffer.com/oembed',
        'instagram.com'     =>    'https://api.instagram.com/publicapi/oembed',

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(function (win, doc) {
  win.addEventListener('load', function() {
    var latlons = [];
    doc.querySelectorAll('.h-geo').forEach( function(geo) {
      var lat = geo.querySelector('data.p-latitude').getAttribute('value');
      var lon = geo.querySelector('data.p-longitude').getAttribute('value');
      if (lat && lon) {
        latlons.push([lat, lon]);
      }
    });

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// Generate a timestamp (in seconds) on the server. This won't change if the page is served from a cache.
var serverTimestamp = <?php echo time(); ?>;
// Create a new Date object from the local date and time on the client.
var localDate = new Date();
// Convert the local date and time to Universal Time (same as the server).
var localUTCString = localDate.toUTCString();
// Create a new Date object from the UTC date and time on the client.
var UTCDate = new Date(localUTCString);
// Generate a timestamp (in seconds) from the UTC date and time on the client.
var clientTimestamp = UTCDate.getTime() / 1000;

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(function (win, doc) {
  win.addEventListener('beforeinstallprompt', function (e) {
    e.preventDefault();
    var deferredPrompt = e;
    var insertionPoint = doc.querySelector('main .contents');
    insertionPoint.insertAdjacentHTML('afterbegin',`
      <div class="feedback" role="dialog" aria-labelledby="homescreen">
      <h2 id="homescreen">Install The Session</h2>
      <p>Would you like to add The Session to your home screen?</p>
      <button class="back">No, thanks</button>

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// Limit the number of items in a specified cache.
function trimCache(cacheName, maxItems) {
  caches.open(cacheName)
  .then( cache => {
    cache.keys()
    .then(keys => {
      if (keys.length > maxItems) {
        cache.delete(keys[0])
        .then( () => {
          trimCache(cacheName, maxItems)

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// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// http://creativecommons.org/publicdomain/zero/1.0/

// HTML files: try the network first, then the cache.
// Other files: try the cache first, then the network.
// Both: cache a fresh version if possible.
// (beware: the cache will grow and grow; there's no cleanup)

const cacheName = 'files';

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// Licensed under a CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
// http://creativecommons.org/publicdomain/zero/1.0/

// Pass in an array of numbers ranging from 0 to 20.

function playSparkline(notes) {
    if (!window.AudioContext && !window.webkitAudioContext) {
        return;
    }
    var playing = null;