add slides for Tech Speaker Meetup 2019

diff --git a/tsmeetup201909/cc-by-sa.svg b/tsmeetup201909/cc-by-sa.svg
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diff --git a/tsmeetup201909/index.html b/tsmeetup201909/index.html
new file mode 100755 (executable)
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+<!DOCTYPE html>
+<html>
+<head>
+  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+  <meta name="Author" content="KaiRo - Robert Kaiser">
+  <title>VR Space: Creating A Solar System With WebXR</title>
+  <link rel="stylesheet" type="text/css" href="slides.css">
+  <script type="text/javascript" src="slides.js"></script>
+  <link rel="contents" href="#index" title="Überblick">
+  <link rel="index" id="link-toc" href="#toc" title="Inhalt">
+  <link rel="start" id="link-start" href="#index" title="Start">
+</head>
+<body>
+<header id="header"><div id="header-text">VR Space</div>
+  <div id="subheader-text"></div>
+  <a id="headerlogo" href="#index" title="Startseite">Mozilla</a>
+</header>
+<nav id="slidenav">
+  <a href="#toc" id="nav-toc" accesskey="t">toc</a> ||
+  <a href="#index" id="nav-start" accesskey="s">start</a> ||
+  <a href="#" id="nav-prev" accesskey="p" hidden>&lt; back</a>
+  <span id="nav-prev-nolink" class="nolink">&lt; back</span> |
+  <a href="#" id="nav-next" id="goNext" accesskey="n" hidden>fwd &gt;</a>
+  <span id="nav-next-nolink" class="nolink">fwd &gt;</span>
+</nav>
+
+<article id="toc" data-title="Inhalt">
+<h1><span>Contents</span></h1>
+<h2>VR Space: Creating A Solar System With WebXR</h2>
+
+<div class="captionedbox">
+<p class="captionedbox-caption">The following slides are available in this presentation:</p>
+<div class="captionedbox-content">
+<ul id="toc-list">
+</ul>
+</article>
+
+<article id="index" data-title="Start Page" data-seconds="600">
+<h1><span>VR Space: Creating A Solar System With WebXR</span></h1>
+<h2>A Step-By-Step Tutorial Of A-Frame</h2>
+
+<div class="simplebox decofont">
+<mark><a href="http://home.kairo.at/">Robert Kaiser</a></mark>
+</div>
+
+<div class="captionedbox">
+<p class="captionedbox-caption decofont"><span id="hidesdesc" class="noadvance">Slides:</span>
+  <a href="https://slides.kairo.at/tsmeetup201909/">https://slides.kairo.at/tsmeetup201909/</a></p>
+<div class="captionedbox-content small">
+<ul class="small" id="slidesdesc">
+  <li>Created for a presentation at <a href="https://wiki.mozilla.org/TechSpeakers/Meetups/Amsterdam_2019">Mozilla
+    Tech Speakers Meetup 2019</a> in Amsterdam, The Netherlands.</li>
+  <li>Written in HTML 5 with CSS 3 and JavaScript.</li>
+  <li>Navigation via links on all slides, via access keys
+   (e.g. "n"/Alt+Shift+N for "next") or back/forward arrow keys</li>
+  <li><a href="#toc">Contents</a></li>
+  <li><a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/"><img
+      alt="Lizenziert unter CC-BY-SA," class="ccinline" src="cc-by-sa.svg"></a>
+    09/2019 Robert Kaiser -
+    "Mozilla", "Firefox" and their logos are
+    <a href="http://www.mozilla.org/foundation/trademarks/list.html">trademarks
+    of Mozilla Foundation</a>.</li>
+</ul>
+</div>
+</div>
+</article>
+
+<article id="introduction" data-title="Introduction - KaiRo">
+<h1><span>Robert Kaiser - KaiRo</span></h1>
+
+<div class="simplebox">
+<img src="kairo.jpg" class="slidepic"
+ alt="Robert Kaiser">
+<ul>
+  <li>kairo@kairo.at / <a href="https://home.kairo.at/">home.kairo.at</a></li>
+  <li><mark><a href="https://events.mozilla.org/techspeakers">Mozilla Tech Speaker</a></mark></li>
+  <li>Based in Vienna, Austria</li>
+  <li>Not on most major social networks</li>
+  <li>But on <a href="https://joindiaspora.com/people/eb2e0ec0ec0d04bc">Diaspora*</a>,
+      <a href="https://mozillians.org/en-US/u/KaiRo/">Mozillians</a>,
+      <a href="https://telegram.me/KaiRo_at">Telegram</a>,
+      <a href="https://www.linkedin.com/in/robert-kaiser-kairo-at">LinkedIn</a>,
+      <a href="https://github.com/KaiRo-at">KaiRo-at at GitHub</a></li>
+</ul>
+<p class="ensurepicinbox"></p>
+</div>
+</article>
+
+<article id="webvr" data-title="WebVR &amp; WebXR">
+<h1><span>WebVR &amp; WebXR</span></h1>
+
+<div class="simplebox">
+<img src="vruser.jpg" class="slidepic"
+ alt="VR headset user">
+<ul>
+  <li><a href="https://webvr.info/">WebVR</a>: <mark>Virtual Reality</mark>
+    powered by Web technologies</li>
+  <li>Evolving into <a href="https://github.com/immersive-web/webxr">WebXR
+    Device API</a> - Mixed Reality (Virtual + Augmented Reality)</li>
+  <li><mark>Open Standard</mark> (proposal), in concert with WebGL, WebAudio
+    and Gamepad APIs</li>
+  <li>Firefox: Windows (55+) &amp; MacOS X (64+) release,
+    <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1310655">Linux in
+    development</a>,
+    <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1419190">WebXR coming
+    soon</a></li>
+  <li>Chrome experimental; support on stand-alone headset browsers</li>
+</ul>
+<p class="ensurepicinbox"></p>
+</div>
+</article>
+
+<article id="aframe" data-title="A-Frame">
+<h1><span>A-Frame + The Sun</span></h1>
+
+<div class="simplebox">
+<img src="step1-sun.png" class="slidepic"
+ alt="Preview: The Sun">
+<pre>
+&lt;<mark>a-scene</mark>&gt;
+  &lt;<mark>a-sphere</mark> id="sun" <small>position="0 0 0" radius="1" color="#FFFF00"</small>&gt;&lt;/a-sphere&gt;
+
+  &lt;a-entity id="cameraRig" <small>position="0 -1 2" movement-controls="speed: .1; fly: true; camera: #head;"&gt;</small>
+    &lt;a-entity id="head" <small>camera="active: true" look-controls position="0 1.6 0"&gt;&lt;/a-entity&gt;</small>
+    &lt;a-entity id="left-hand" <small>link-controls="hand: left "…&gt;&lt;/a-entity&gt;</small>
+    &lt;a-entity id="right-hand" <small>link-controls="hand: right "…&gt;&lt;/a-entity&gt;</small>
+  &lt;a-entity&gt;
+&lt;/a-scene&gt;
+</pre>
+<p><a href="https://glitch.com/~vrspace-1-sun" target="_blank">edit/view</a>
+- A-Frame documentation at <a href="https://aframe.io/">aframe.io</a>
+<p class="ensurepicinbox"></p>
+</div>
+</article>
+
+<article id="planet" data-title="Adding a Planet">
+<h1><span>Adding a Planet</span></h1>
+
+<div class="simplebox">
+<img src="step2-planet.png" class="slidepic"
+ alt="Preview: A planet">
+<pre>
+&lt;a-scene&gt;
+  …
+  &lt;a-entity position="0 0 0" rotation="0 -120 0"
+            <mark>animation="property: rotation;</mark> to: 0 240 0; <small>loop: true; dur: 600000; easing: linear;"&gt;</small>
+    &lt;<mark>a-sphere id="redplanet"</mark> position="0 0 6" <small>radius=".3" color="#FF8080"&gt;&lt;/a-sphere&gt;</small>
+  &lt;/a-entity&gt;
+  …
+&lt;/a-scene&gt;
+</pre>
+<p><a href="https://glitch.com/~vrspace-2-planet" target="_blank">edit/view</a>
+<p class="ensurepicinbox"></p>
+</div>
+</article>
+
+<article id="light" data-title="Let There Be Light">
+<h1><span>Let There Be Light!</span></h1>
+
+<div class="simplebox">
+<img src="step3-light.png" class="slidepic"
+ alt="Preview: Better Lights">
+<pre>
+&lt;a-scene&gt;
+  &lt;a-entity <mark>light="type: ambient;</mark> color: #BBB; intensity: .1;"&gt;&lt;/a-entity&gt;
+  &lt;a-sphere id="sun" <small>position="0 0 0" radius="1" color="#FFFF00"</small>
+            <mark>material="emissive: #FFFF00;" light="type: point;</mark> <small>intensity: 1; distance: 50; decay: 2"&gt;&lt;/a-sphere&gt;</small>
+  …
+&lt;/a-scene&gt;
+</pre>
+<p><a href="https://glitch.com/~vrspace-3-light" target="_blank">edit/view</a>
+<p class="ensurepicinbox"></p>
+</div>
+</article>
+
+<article id="realistic" data-title="Realistic Planets">
+<h1><span>Realistic Planets</span></h1>
+
+<div class="simplebox">
+<img src="step4-realistic.png" class="slidepic"
+ alt="Preview: Realistic Planets">
+<pre>
+&lt;a-scene&gt;
+  <small>&lt;a-assets&gt;</small>
+    <small>&lt;a-asset-item id="saturnmodel" response-type="arraybuffer" src="Saturn_1_120536.glb"&gt;&lt;/a-asset-item&gt;</small>
+  <small>&lt;/a-assets&gt;</small>
+  …
+  &lt;a-entity …&gt;
+    &lt;a-sphere id="earth" <mark>src="<a href="https://xr.kairo.at//space/earth_equirect.jpg">earth_equirect.jpg</a>"</mark> …&gt;&lt;/a-sphere&gt;
+  &lt;/a-entity&gt;
+  &lt;a-entity …&gt;
+    &lt;a-sphere id="saturn" <mark>gltf-model="#saturnmodel"</mark> scale="0.003 0.003 0.003" …&gt;&lt;/a-sphere&gt;
+  &lt;/a-entity&gt;
+  …
+&lt;/a-scene&gt;
+</pre>
+<p><a href="https://glitch.com/~vrspace-4-realistic" target="_blank">edit/view</a>
+<p class="ensurepicinbox"></p>
+</div>
+</article>
+
+<article id="ship" data-title="Space Ship">
+<h1><span>Space Ship</span></h1>
+
+<div class="simplebox">
+<img src="step5-ship.png" class="slidepic"
+ alt="Preview: Space ship">
+<mark>"All I ask is a tall ship, and a star to steer by."</mark>
+<br><small><i>- James T. Kirk, citing John Masefield</i></small>
+<pre>
+&lt;a-scene&gt;
+  …
+  &lt;a-entity …&gt;
+    &lt;a-entity id="ship" …&gt;
+      &lt;<mark>a-cylinder</mark> <small>position="0 0 0" radius=".4" height="0.04" color="#CCC0DD"&gt;&lt;/a-cylinder&gt;</small>
+      <small>&lt;a-cylinder rotation="90 0 0" position="0.2 0.05 .9" radius=".03" height=".8" color="#CCC0DD"&gt;&lt;/a-cylinder&gt;</small>
+      <small>&lt;a-cylinder rotation="90 0 0" position="-0.2 0.05 .9" radius=".03" height=".8" color="#CCC0DD"&gt;&lt;/a-cylinder&gt;</small>
+      …
+    &lt;/a-entity&gt;
+  &lt;/a-entity&gt;
+  …
+&lt;/a-scene&gt;
+</pre>
+<p><a href="https://glitch.com/~vrspace-5-ship" target="_blank">edit/view</a>
+<p class="ensurepicinbox"></p>
+</div>
+</article>
+
+<article id="end" data-title="The End">
+
+<div class="simplebox endslidecontainer">
+<h1 class="cent endslidetext"><span>Questions?</span></h1>
+<h2 class="cent endslidetext"><span><a href="https://glitch.com/~vrspace-1-sun">glitch.com/~vrspace-1-sun</a></span></h2>
+<h2 class="cent endslidetext"><span><a href="https://glitch.com/~vrspace-5-ship">glitch.com/~vrspace-5-ship</a></span></h2>
+<h3 class="cent endslidetext"><span><a href="https://xr.kairo.at/space">xr.kairo.at/space</a></span></h3>
+<h3 class="cent endslidetext"><span><a href="https://github.com/KaiRo-at/xr/tree/master/space">github.com/KaiRo-at/xr/tree/master/space</a></span></h3>
+<img src="vrspace-large.png" class="sshot endslidepic" alt="VR Space in 2D">
+</div>
+</article>
+
+</body>
+</html>

diff --git a/tsmeetup201909/kairo.jpg b/tsmeetup201909/kairo.jpg
new file mode 100644 (file)
index 0000000..23ef9e0
Binary files /dev/null and b/tsmeetup201909/kairo.jpg differ

diff --git a/tsmeetup201909/slides.css b/tsmeetup201909/slides.css
new file mode 100644 (file)
index 0000000..80cf3f0
--- /dev/null
+++ b/tsmeetup201909/slides.css
@@ -0,0 +1,469 @@
+/**************************
+ * styles for talk slides *
+ *    by Robert Kaiser    *
+ *    <kairo@kairo.at>    *
+ *   (for FOSDEM 2013)    *
+ **************************/
+
+
+/***** base style *****/
+
+@font-face {
+  font-family: 'Open Sans';
+  src: url('template/OpenSans-Regular-webfont.woff');
+  font-weight: normal;
+  font-style: normal;
+}
+
+@font-face {
+  font-family: 'Open Sans';
+  src: url('template/OpenSans-Semibold-webfont.woff');
+  font-weight: bold;
+  font-style: normal;
+}
+
+@font-face {
+  font-family: 'Open Sans';
+  src: url('template/OpenSans-Italic-webfont.woff');
+  font-weight: normal;
+  font-style: italic;
+}
+
+@font-face {
+  font-family: 'Zilla Slab';
+  src: url('template/ZillaSlab-Regular.woff2');
+  font-weight: normal;
+  font-style: normal;
+}
+
+@font-face {
+  font-family: 'Zilla Slab';
+  src: url('template/ZillaSlab-Bold.woff2');
+  font-weight: bold;
+  font-style: normal;
+}
+
+@font-face {
+  font-family: 'Zilla Slab Highlight';
+  src: url('template/ZillaSlabHighlight-Regular.woff2');
+  font-weight: normal;
+  font-style: normal;
+}
+
+@font-face {
+  font-family: 'Zilla Slab Highlight';
+  src: url('template/ZillaSlabHighlight-Bold.woff2');
+  font-weight: bold;
+  font-style: normal;
+}
+
+html {
+  overflow: hidden; /* to make translations not paint scrollbars */
+  background: white;
+  height: 100%;
+}
+
+body {
+  margin: 0px;
+  padding: 0px;
+  border: 0px;
+  font-family: "Open Sans", sans-serif;
+  font-size: 2em;
+  color: black;
+  height: 100%;
+}
+
+ul {
+  padding-left: 1.2em;
+  margin-bottom: 0.5em;
+}
+
+ul:first-child,
+ul:last-child {
+  margin-top: 0;
+}
+
+#header {
+  height: 44px;
+  position: relative;
+  font-family: "Zilla Slab", monospace;
+  border-bottom: 3px solid black;
+}
+
+#headerlogo {
+  position: absolute;
+  display: block;
+  right: 2px;
+  top: 2px;
+  text-indent: -2000px;
+  font-size: 1px;
+  overflow: hidden;
+  height: 40px;
+  width: 140px;
+  background: url("template/mozilla_logo2017.svg") no-repeat;
+}
+
+#header-text {
+  position: relative;
+  top: 5px;
+  left: 25px;
+  width: 200px;
+  width: -moz-fit-content;
+  width: -webkit-fit-content;
+  width: fit-content;
+  padding: 0 5px;
+  font-size: 20px;
+  font-weight: bold;
+  color: white;
+  background-color: black;
+}
+
+#header-text.neartime {
+  color: #00FFFF;
+}
+
+#header-text.ontime {
+  color: #54FFBD;
+}
+
+#header-text.overtime {
+  color: #FF4F5E;
+}
+
+#subheader-text {
+  color: black;
+  position: relative;
+  top: 3px;
+  left: 25px;
+  width: calc(100% - 50px);
+  padding: 0 5px;
+  font-size: 10px;
+}
+
+#slidenav {
+  position: absolute;
+  right: 200px;
+  top: 15px;
+  font-family: "Zilla Slab", monospace;
+  font-size: 10px;
+}
+
+#slidenav a:link,
+#slidenav a:visited {
+  color: black;
+}
+
+#slidenav a:hover,
+#slidenav a:active {
+  color: #959595;
+}
+
+#slidenav .nolink {
+  color: #E7E5E2;
+}
+
+article {
+  position: absolute;
+  width: 100%;
+  /* header is 40px, 7px to have a bit of distance,
+   * 3px height-reducing on the bottom for safety */
+  top: 47px;
+  height: calc(100% - 50px);
+  overflow: auto;
+
+  transition-property: transform, opacity;
+  transition-duration: 3s;
+  transition-timing-function: ease;
+  transform-origin: center 5em;
+
+  opacity: 0;
+/*
+  transform: translate(-100%, 0);
+*/
+/*
+  transform: scale(0.1) rotate(360deg) translate(-200%, 0);
+*/
+  transform: scale(0.1) translate(-400%, 0);
+}
+
+article[aria-selected="true"] {
+  opacity: 1;
+  transform: scale(1) rotate(0deg) translate(0, 0);
+}
+
+article[aria-selected="true"] ~ article {
+  opacity: 0;
+/*
+  transform: translate(100%, 0);
+*/
+/*
+  transform: scale(0.1) rotate(-360deg) translate(200%, 0);
+*/
+  transform: scale(0.1) translate(400%, 0);
+}
+
+/***** headers *****/
+
+h1, h2, h3, h4 {
+  margin: 0.5em 0;
+  font-family: "Zilla Slab", monospace;
+  font-weight: bold;
+  color: black;
+  text-align: center;
+}
+
+h1 {
+  font-family: "Zilla Slab Highlight", "Zilla Slab", monospace;
+  margin-top: 0.5em;
+  font-size: 2.2em;
+}
+
+h1 span {
+  font-family: "Zilla Slab", monospace;
+  background-color: black;
+  color: white;
+  padding: 0 10px;
+}
+
+h2 {
+  font-size: 1.3em;
+}
+
+h3 {
+  font-size: 1.1em;
+}
+
+h4 {
+  font-size: 1em;
+  text-align: left;
+}
+
+/***** boxes *****/
+
+.simplebox {
+  padding: 0.5em;
+}
+
+.captionedbox {
+  padding: 0px;
+}
+
+.simplebox,
+.captionedbox {
+  margin: 1em;
+  background-color: white;
+  /* box-shadow: 0 0 0 1px black inset; */
+  /* border-bottom: 1px solid black; */
+}
+
+.captionedbox-content {
+  margin: 0;
+  padding: 0.5em;
+  border: 0px;
+  border-top: 1px solid black;
+}
+
+.captionedbox-caption {
+  margin: 0;
+  padding: 0.5em;
+  font-weight: bold;
+}
+
+.simplebox + .simplebox,
+.captionedbox + .simplebox,
+.simplebox + .captionedbox,
+.captionedbox + .captionedbox {
+  border-top: 1px solid black;
+}
+
+/***** misc formatting *****/
+
+mark {
+  font-family: "Zilla Slab", monospace;
+  font-weight: bold;
+  color: black;
+  background-color: #FFF44F;
+}
+
+.decofont {
+  font-family: "Zilla Slab", monospace;
+}
+
+.border {
+  border: 1px solid black;
+  padding: 0.5em;
+}
+
+.sshot {
+  max-width: 100%;
+  max-height: 20em;
+  /* box-shadow: black 1px 1px 3px 2px; */
+}
+
+.slidepic {
+  float: right;
+  margin-left: .5em;
+  max-height: 20em;
+  max-width: 25%;
+}
+
+.ensurepicinbox {
+  clear: both;
+  font-size: 1px;
+  margin: 0;
+}
+
+.largetext {
+  font-size: 2em;
+}
+
+ul > li {
+  margin: 0.5em 0;
+}
+
+.columns2 {
+  -moz-columns: 2;
+}
+
+ul.nobullets > li {
+  list-style-type: none;
+}
+
+ul.arrows > li {
+  list-style-type: none;
+}
+ul.arrows > li:before {
+  content: "\21d2\20"; /* \2192 would be single thin arrow, hex 20 is space */
+}
+
+.cent {
+  text-align: center;
+}
+
+.topmargin {
+  margin-top: 0.5em;
+}
+
+.akey {
+  text-decoration: underline;
+}
+
+.hidden {
+  display: none;
+}
+
+a:link, a:visited { color: #00458B; text-decoration: none; }
+a:hover, a:active { color: #959595; text-decoration: underline; }
+
+mark a:link, mark a:visited { color: #005E5E; }
+mark a:hover, mark a:active { color: #005E5E; }
+
+h1 span a:link, h1 span a:visited,
+h1 span a:hover, h1 span a:active { color: white; }
+
+pre { margin: 0; }
+
+/***** small stuff *****/
+
+small,
+.small {
+  font-size: 0.75em;
+}
+
+ul.small,
+.small ul {
+  padding: 0px;
+  border: 0px;
+  margin: 0px 0px 0px 1em;
+}
+
+ul.small > li
+.small ul > li {
+  margin: 0px;
+  padding: 0px;
+  border: 0px;
+}
+
+/***** specific slides *****/
+
+/* start slide */
+.ccinline {
+  border-width: 0;
+  vertical-align: bottom;
+  height: 1.75em;
+}
+
+/* end slide */
+.endslidecontainer {
+  position: relative;
+}
+
+.endslidepic {
+  width: 100%;
+  max-height: initial;
+  z-index: 1;
+}
+
+.endslidetext {
+  position: absolute;
+  width: calc(100% - 2rem);
+  z-index: 3;
+}
+
+h1.endslidetext {
+/*  color: white; */
+  font-size: 2.5em;
+}
+
+h2.endslidetext,
+h3.endslidetext {
+  font-size: 1.5em;
+}
+
+h2.endslidetext > span,
+h3.endslidetext > span {
+  background-color: white;
+  padding: 0 10px;
+}
+
+.endslidetext:first-child {
+  top: 1rem;
+}
+
+.endslidetext:nth-child(2) {
+  top: 11rem;
+}
+
+.endslidetext:nth-child(3) {
+  top: 15rem;
+}
+
+.endslidetext:nth-child(4) {
+  top: 29rem;
+}
+
+.endslidetext:nth-child(5) {
+  top: 34rem;
+}
+
+@media (min-resolution: 1.3dppx) {
+  h2.endslidetext,
+  h3.endslidetext {
+    font-size: 1.2em;
+  }
+  .endslidetext:first-child {
+    top: 0rem;
+  }
+  .endslidetext:nth-child(2) {
+    top: 10rem;
+  }
+  .endslidetext:nth-child(3) {
+    top: 13rem;
+  }
+  .endslidetext:nth-child(4) {
+    top: 18.5rem;
+  }
+  .endslidetext:nth-child(5) {
+    top: 22rem;
+  }
+}

diff --git a/tsmeetup201909/slides.js b/tsmeetup201909/slides.js
new file mode 100644 (file)
index 0000000..8d4bb28
--- /dev/null
+++ b/tsmeetup201909/slides.js
@@ -0,0 +1,233 @@
+/******************************
+ * JavaScript for talk slides *
+ *      by Robert Kaiser      *
+ *      <kairo@kairo.at>      *
+ *     (for FOSDEM 2011)      *
+ ******************************/
+
+var slides = {};
+var articleNodes;
+var currentSlide;
+var currentIdx;
+var defaultIdx = 1; // set to slide index to show by default
+var firstIdx = 2; // set no value if to use first available
+var lastIdx; // set no value if to use last available
+
+var pageTitle, headerText, subHeaderText;
+var navPrev, navNext, navPrevNolink, navNextNolink;
+
+// Slide timer - color variation of headerText
+// Time per slide is total presentation length divided by number of slides
+// except start and end slide.
+var presLengthSeconds = 5 * 60;
+var slideStart, timerMSec;
+
+// Called when the document has been loaded.
+window.onload = function() {
+  pageTitle = document.getElementsByTagName("title")[0];
+  headerText = document.getElementById("header-text");
+  subHeaderText = document.getElementById("subheader-text");
+  navPrev = document.getElementById("nav-prev");
+  navNext = document.getElementById("nav-next");
+  navPrevNolink = document.getElementById("nav-prev-nolink");
+  navNextNolink = document.getElementById("nav-next-nolink");
+  articleNodes = document.getElementsByTagName("article");
+
+  if (!firstIdx)
+    firstIdx = 0;
+  if (!lastIdx)
+    lastIdx = articleNodes.length - 1;
+  var slideSeconds = presLengthSeconds / (lastIdx - firstIdx);
+  timerMSec = 1000 * (slideSeconds / 3);
+
+  // Get a list of all slides (articles).
+  subHeaderText.textContent = articleNodes.length + " slides...";
+  for (var i = 0; i < articleNodes.length; ++i) {
+    subHeaderText.textContent = "Indexing slide " + i + " / " + articleNodes.length;
+    if (!articleNodes[i].id)
+      articleNodes[i].id = "slide_" + i;
+
+    slides[articleNodes[i].id] = {
+        "idx": i,
+        "name": articleNodes[i].id,
+        "title": articleNodes[i].dataset.title ? articleNodes[i].dataset.title : articleNodes[i].id,
+        "obj": articleNodes[i],
+        "timeSeconds": articleNodes[i].dataset.seconds ? articleNodes[i].dataset.seconds : slideSeconds,
+    };
+
+    if (location.hash.length &&
+        (location.hash == "#" + articleNodes[i].id || location.hash == "#" + i)) {
+      articleNodes[i].setAttribute("aria-selected", "true");
+      currentSlide = slides[articleNodes[i].id];
+      currentIdx = i;
+    }
+  }
+
+  if (!currentSlide) {
+    currentIdx = defaultIdx;
+    currentSlide = slides[articleNodes[currentIdx].id];
+    currentSlide.obj.setAttribute("aria-selected", "true");
+    location.hash = "#" + currentSlide.name;
+  }
+  updateDisplay();
+  document.getElementById("hidesdesc").onclick = function(event) {
+    document.getElementById("slidesdesc").classList.toggle("hidden");
+  }
+}
+
+// Called when the hash part of the location changes.
+function locationHashChanged() {
+  if (location.hash.length > 1) {
+    var hashtag = location.hash.substring(1);
+    // If not a number, treat as ID
+    if (isNaN(hashtag) && slides[hashtag]) {
+      currentSlide.obj.removeAttribute("aria-selected");
+      currentSlide = slides[hashtag];
+      currentIdx = currentSlide.idx;
+      currentSlide.obj.setAttribute("aria-selected", "true");
+      updateDisplay();
+    }
+    else if (articleNodes[hashtag]) {
+      currentSlide.obj.removeAttribute("aria-selected");
+      currentIdx = hashtag;
+      currentSlide = slides[articleNodes[currentIdx].id];
+      currentSlide.obj.setAttribute("aria-selected", "true");
+      updateDisplay();
+    }
+  }
+}
+window.onhashchange = locationHashChanged;
+
+// Update the display after we updated what slide is shown.
+function updateDisplay() {
+  if (currentIdx >= firstIdx && currentIdx <= lastIdx &&
+      currentSlide.name != "toc")
+    subHeaderText.textContent = (currentIdx - firstIdx + 1) + "/" +
+                                (lastIdx - firstIdx + 1) + " - " +
+                                currentSlide.title;
+  else
+    subHeaderText.textContent = currentSlide.title;
+  pageTitle.textContent = headerText.textContent + ": " + currentSlide.title;
+  if (currentIdx > firstIdx && currentSlide.name != "toc") {
+    navPrev.hidden = false;
+    navPrev.href = "#" + articleNodes[currentIdx - 1].id;
+    navPrevNolink.hidden = true;
+  }
+  else {
+    navPrev.hidden = true;
+    navPrevNolink.hidden = false;
+  }
+  if (currentIdx < lastIdx && currentSlide.name != "toc") {
+    navNext.hidden = false;
+    navNext.href = "#" + articleNodes[currentIdx + 1].id;
+    navNextNolink.hidden = true;
+  }
+  else {
+    navNext.hidden = true;
+    navNextNolink.hidden = false;
+  }
+  headerText.className = "";
+  slideStart = new Date();
+  timerMSec = 1000 * (currentSlide.timeSeconds / 3);
+  if (currentSlide.name == "toc")
+    createTOC();
+  else
+    setTimeout(timerFired, timerMSec);
+}
+
+// Create TOC list.
+function createTOC() {
+ var list = document.getElementById("toc-list");
+ if (!list.getElementsByTagName("li").length) {
+   for (var slide in slides) {
+     if (slide != "toc") {
+       var item = document.createElement("li");
+       var link = document.createElement("a");
+       var slideHeaders = slides[slide].obj.getElementsByTagName("h1");
+       if (slideHeaders.length)
+         link.textContent = slideHeaders[0].textContent;
+       else
+         link.textContent = slides[slide].title;
+       link.href = "#" + slides[slide].name;
+       item.appendChild(link);
+       list.appendChild(item);
+     }
+   }
+ }
+}
+
+// Do timed color variation on slides.
+function timerFired() {
+  var slideCurrent = new Date();
+  var secondsDiff = Math.round((slideCurrent.getTime() - slideStart.getTime()) / 1000);
+  if (secondsDiff >= currentSlide.timeSeconds) {
+    headerText.className = "overtime";
+  }
+  else if (secondsDiff >= Math.round(2 * currentSlide.timeSeconds / 3)) {
+    headerText.className = "ontime";
+    setTimeout(timerFired, timerMSec);
+  }
+  else if (secondsDiff >= Math.round(currentSlide.timeSeconds / 3)) {
+    headerText.className = "neartime";
+    setTimeout(timerFired, timerMSec);
+  }
+  else {
+    // We should never come here, but if we do, go into a 100ms loop until we get over the upcoming step.
+    setTimeout(timerFired, 100);
+  }
+}
+
+// Keyboard/click nav functionality, mostly inherited from FOSDEM 2007.
+(function() {
+  function go(where) {
+    where = where || "next";
+    var navElem = document.getElementById("nav-" + where);
+    if (!navElem.hidden)
+      window.location.href = navElem.href;
+  }
+
+  function handleClick(e) {
+    e = e || event;
+    var target = (window.event) ? e.srcElement : e.target;
+    if (e.which == 1 && target.nodeName != "A" && target.nodeName != "VIDEO" && !target.classList.contains("noadvance"))
+      go("next");
+  }
+
+  function handleKeyPress(e) {
+    e = e || event;
+    switch (e.key) {
+      // See https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode#Constants_for_keyCode_value
+      case "ArrowLeft":
+      case "ArrowDown":
+      case "Left": // non-standard, old browsers
+      case "Down": // non-standard, old browsers
+      case "PageDown":
+      case "P":
+      case "p":
+      case "H": //8bitdo Zero "X"
+      case "h": //8bitdo Zero "X"
+        go("prev"); break;
+      case "ArrowRight":
+      case "ArrowUp":
+      case "Right": // non-standard, old browsers
+      case "Up": // non-standard, old browsers
+      case "PageUp":
+      case "N":
+      case "n":
+      case "J": //8bitdo Zero "B"
+      case "j": //8bitdo Zero "B"
+        go("next"); break;
+      case "Home":
+      case "I": //8bitdo Zero "Y"
+      case "i": //8bitdo Zero "Y"
+        go("start"); break;
+      case "End":
+      case "G": //8bitdo Zero "A"
+      case "g": //8bitdo Zero "A"
+        go("toc"); break;
+    }
+  }
+
+  window.onclick = handleClick;
+  window.onkeydown = handleKeyPress;
+})();

diff --git a/tsmeetup201909/step1-sun.png b/tsmeetup201909/step1-sun.png
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diff --git a/tsmeetup201909/template/OpenSans-Italic-webfont.woff b/tsmeetup201909/template/OpenSans-Italic-webfont.woff
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