Add rook talk

Change-Id: I76f535f42832abb086fc09699b0ff95b8c7ee894
2019-05-10 13:41:40 -07:00 · 2019-05-10 13:41:40 -07:00 · 1943289737
parent e340651370
commit 1943289737
36 changed files with 1340 additions and 99 deletions
--- a/.gitreview
+++ b/.gitreview
@ -2,4 +2,4 @@
 host=review.opendev.org
 port=29418
 project=opendev/publications.git
-defaultbranch=template
+defaultbranch=rook
--- a/README.rst
+++ b/README.rst
@ -1,34 +1,19 @@
-Template Branch for new OpenStack Infra Publications
-====================================================
+Highly Available Git on CephFS with Rook, Kubernetes, and OpenStack
+===================================================================

-Creating new OpenStack Infra Publications is easy and you have started
-in the right place.
+Abstract
+--------

-  1. Clone publications, create and checkout template tracking branch::
+The OpenDev Project operates infrastructure for some of the largest
+and most active Open Source projects. It needs a bulletproof system
+for serving the git repositories for those projects, and it needs to
+be entirely open source.

-       git clone git://git.openstack.org/openstack-infra/publications
-       cd publications
-       git review -s
-       git checkout -b template origin/template
-
-  2. Create a new branch based on this template branch.
-     ``git checkout -b $BRANCH_NAME``.
-  3. Edit ``.gitreview`` and change the defaultbranch value to
-     ``$BRANCH_NAME``.
-  4. Create ``$BRANCH_NAME`` in Gerrit. It should be based on the
-     template branch as well to avoid any potential merge conflicts in
-     your first commit. Not everyone has the ability to do this in
-     Gerrit. If you don't, ask an openstack infra core to do it for you.
-  5. Now we get to do the fun stuff. Edit index.html editing lines with
-     ``CHANGEME`` or ``changeme`` in them. You can also add new slides
-     if you like but that isn't necessary in this bootstrapping change.
-     You can follow up with new slides in subsequent changes.
-  6. Edit this file, ``README.rst``. The title of this document will
-     be the name used on the root publications index so be sure to
-     update the title. You should also add an Abstract section and
-     general talk info.
-  7. At this point you are ready to push your new changes back up to
-     Gerrit. ``git commit -a && git review``
-  8. Finally, if you want notifications for subsequent branch updates
-     to be shown in the #openstack-infra channel, add your branch to
-     gerritbot/channels.yaml in the project-config repository.
+This presentation will show how OpenDev uses Kubernetes and Rook to
+deploy an entirely virtualized Ceph cluster and CephFS to serve git
+repositories. The cluster is fully integrated with the OpenStack cloud
+provider it runs in, so that OpenStack automatically provides load
+balancing and the virtualized block storage that supports the Ceph
+cluster. The deployment process is automated with Ansible and allows
+for easy experimentation and testing since the entire system can be
+recreated in a matter of minutes.
--- a/graphics/banner.jpg
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--- a/graphics/bullet-nofold-dim.png
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--- a/graphics/bullet-nofold.gif
+++ b/graphics/bullet-nofold.gif
--- a/graphics/bullet-nofold.png
+++ b/graphics/bullet-nofold.png
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--- a/graphics/bullet-unfold-dim.png
+++ b/graphics/bullet-unfold-dim.png
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+++ b/graphics/bullet-unfold.png
--- a/graphics/bullet.png
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--- a/index.html
+++ b/index.html
@ -3,63 +3,357 @@
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en-US">
 <head>
-<title>Publication Title CHANGE ME</title>
 <meta name="generator" content=
 "HTML Tidy for Linux/x86 (vers 1st November 2003), see www.w3.org" />
+<title>Highly Available Git on CephFS with Rook, Kubernetes, and OpenStack</title>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <meta name="copyright" content=
 "Copyright &#169; 2005-2010 W3C (MIT, ERCIM, Keio)" />
-<meta name="duration" content="60" />
-<meta name="font-size-adjustment" content="0" />
+<meta name="duration" content="40" />
 <link rel="stylesheet" href="styles/slidy.css" type="text/css" />
-<link rel="stylesheet" href="styles/openstack.css" type="text/css" />
+<link rel="stylesheet" href="styles/local.css" type="text/css" />
+<link rel="stylesheet" href="styles/tty-player.css" />
 <script src="scripts/slidy.js" charset="utf-8" type="text/javascript"></script>
+<script src="scripts/webcomponents-lite.min.js"></script>
+<script src="scripts/term.min.js"></script>
+<script src="scripts/tty-player.min.js"></script>
+
+
 </head>
 <body>
-<div class="background"><img alt="" id="head-icon"
-src="graphics/openstack-cloud-software-horizontal-small.png" /></div>
+        <div class="background"><object id="head-logo"
+        data="graphics/opendev.svg" type="image/svg+xml"
+        title="OpenDev logo"><a href="https://opendev.org/"></a></object></div>

-<div class="slide cover titlepage">
-  <!-- hidden style graphics to ensure they are saved with other content -->
-  <img class="hidden" src="graphics/bullet.png" alt="" />
-  <img class="hidden" src="graphics/fold.gif" alt="" />
-  <img class="hidden" src="graphics/unfold.gif" alt="" />
-  <img class="hidden" src="graphics/fold-dim.gif" alt="" />
-  <img class="hidden" src="graphics/nofold-dim.gif" alt="" />
-  <img class="hidden" src="graphics/unfold-dim.gif" alt="" />
-  <img class="hidden" src="graphics/bullet-fold.gif" alt="" />
-  <img class="hidden" src="graphics/bullet-unfold.gif" alt="" />
-  <img class="hidden" src="graphics/bullet-fold-dim.gif" alt="" />
-  <img class="hidden" src="graphics/bullet-nofold-dim.gif" alt="" />
-  <img class="hidden" src="graphics/bullet-unfold-dim.gif" alt="" />
-  <img src="graphics/openstack-cloud-software-vertical-large.png" alt="OpenStack logo" class="cover" />
-  <h1>Publication Title CHANGE ME<br />
-  <span class="smaller">Publication SubTitle CHANGE ME</span></h1>
-  <hr />
-  <div class="smaller">Your Name CHANGE ME
-    &lt;<a href="mailto:changeme@example.com">changeme@example.com</a>&gt;</div>
-</div>
+        <div class="slide cover title">
+                  <!-- hidden style graphics to ensure they are saved with other content -->
+                <img class="hidden" src="graphics/bullet.png" alt="" />
+                <img class="hidden" src="graphics/fold.gif" alt="" />
+                <img class="hidden" src="graphics/unfold.gif" alt="" />
+                <img class="hidden" src="graphics/fold-dim.gif" alt="" />
+                <img class="hidden" src="graphics/nofold-dim.gif" alt="" />
+                <img class="hidden" src="graphics/unfold-dim.gif" alt="" />
+                <img class="hidden" src="graphics/bullet-fold.gif" alt="" />
+                <img class="hidden" src="graphics/bullet-unfold.gif" alt="" />
+                <img class="hidden" src="graphics/bullet-fold-dim.gif" alt="" />
+                <img class="hidden" src="graphics/bullet-nofold-dim.gif" alt="" />
+                <img class="hidden" src="graphics/bullet-unfold-dim.gif" alt="" />
+                <section id="cover">
+                        <h1>Highly Available Git on CephFS with Rook, Kubernetes, and OpenStack</h1>
+                        <br />
+                        <br />
+                        <br />
+                        <br />
+                </section>
+        </div>
+	<div id="what-is-opendev" class="slide section level1">
+	  <h1>What is OpenDev?</h1>
+	  <blockquote>
+	  <p>Free software needs free tools</p>
+	  <p>&nbsp;&nbsp;&nbsp;&nbsp;-- Benjamin Mako Hill</p>
+	  </blockquote>
+	  <p>OpenStack is one of the top-three most active Open Source
+	  projects in the world, along with Chromium and the Linux
+	  Kernel.</p>
+	</div>

-<div class="slide">
-  <h1>OpenStack</h1>
+	<div id="service" class="slide section level1">
+	  <h1>Service</h1>
+	  <ul>
+	    <li>Gerrit for code review</li>
+	    <li>Gitea for code hosting (cloning, browsing, etc)</li>
+	    <li>Zuul for CI and CD (including self-deployment)</li>
+	  </ul>
+	</div>
+	
+	<div id="gitea-service" class="slide section level1">
+	  <h1>Gitea Service</h1>
+	  <p>Everything should be HA and shared</p>
+	  <p>Dependencies:</p>
+	  <ul>
+	    <li>Shared Filesystem (cephfs)</li>
+	    <li>Database (Percona xtradb)</li>
+	    <li>TODO: Elasticsearch cluster</li>
+	  </ul>
+	  <p>All run in Kubernetes</p>
+	</div>
+	
+	<div id="openstack-cloud" class="slide section level1">
+	  <h1>OpenStack Cloud</h1>
+	  <ul>
+	    <li>Provides services we need for our deployment</li>
+	    <ul>
+	      <li>Load balancers</li>
+	      <li>Block storage</li>
+	      <li>Virtual machines</li>
+	    </ul>
+	    <li>Helpful if specific kernel versions/features or extra devices needed</li>
+	    <li>Multiple vendors</li>
+	    <ul>
+	      <li>Currently using 8 public/private clouds</li>
+	    </ul>
+	    <li>Free software all the way down</li>
+	  </ul>
+	</div>
+	
+	<div id="openstack-integration-with-kubernetes" class="slide section level1">
+	  <h1>OpenStack Integration with Kubernetes</h1>
+	  <ul>
+	    <li>Cinder driver provides volume backend</li>
+	    <ul><li>Useful for database, but not rook</li></ul>
+	    <li>Octavia load balancer provides ingress</li>
+	  </ul>
+	</div>
+	
+	<div id="rook" class="slide section level1">
+	  <h1>Rook</h1>
+	  <ul>
+	    <li>Kubernetes operator for storage including Ceph</li>
+	    <li>1.0+ has beta support for CSI</li>
+	    <li>Using Flexstorage driver
+	      <ul>
+		<li>Add volume to k8s minions</li>
+	    </ul></li>
+	  </ul>
+	</div>
+	
+	<div id="k8s-on-openstack" class="slide section level1">
+	  <h1>k8s-on-openstack</h1>
+	  <p><a href="https://github.com/infraly/k8s-on-openstack" class="uri">https://github.com/infraly/k8s-on-openstack</a></p>

-  <p>This is the first slide. CHANGE ME and add many more.</p>
+	  <p>env.sh: </p>
+	  
+<pre>
+export NAME="opendev-k8s"
+export IMAGE="Ubuntu 16.04.1 LTS [2017-03-03]"
+export MASTER_FLAVOR="v2-highcpu-4"
+export MASTER_BOOT_FROM_VOLUME="True"
+export NODE_FLAVOR="v2-highcpu-8"
+export NODE_AUTO_IP="True"
+export NODE_BOOT_FROM_VOLUME="True"
+export NODE_VOLUME_SIZE="64"
+export NODE_EXTRA_VOLUME="True"
+export NODE_EXTRA_VOLUME_SIZE="80"
+export NODE_COUNT="3"
+export USE_OCTAVIA="True"
+export BLOCK_STORAGE_VERSION='v3'
+</pre>
+	</div>

-  <center>
-    <img src="images/openstack-software-diagram.png"/>
-  </center>
-</div>
+	<div id="k8s-on-openstack-1" class="slide section level1">
+	  <h1>k8s-on-openstack</h1>

-<div class="slide">
-  <h1>Thanks!</h1>
+	  <p> Bootstrap the cluster </p>
+	  <center>
+	    <tty-player controls src="recordings/k8s-1.ttyrec"></tty-player>
+	  </center>
+	</div>

-  <p><img src="images/stack-o-pancakes-150x150.png"/>
+	<div id="k8s-on-openstack-2" class="slide section level1">
+	  <h1>k8s-on-openstack</h1>
+	  <ul>
+	    <li>1 master</li>
+	    <li>3 minions</li>
+	    <li>log in as root</li>
+	    <li>use <code>journalctl</code> to see container logs</li>
+	    <li>kubectl to examine the k8s cluster</li>
+	  </ul>
+	</div>

-  <p>
-    These slides available at: <a href="http://docs.openstack.org/infra/publications/">http://docs.openstack.org/infra/publications/</a>
-  </p>
+	<div id="k8s-on-openstack-3" class="slide section level1">
+	  <h1>k8s-on-openstack</h1>

-</div>
+	  <p> We have a cluster! </p>
+	  <center>
+	    <tty-player controls src="recordings/k8s-2.ttyrec"></tty-player>
+	  </center>
+	</div>
+
+	<div id="k8s-on-openstack-for-rook" class="slide section level1">
+	  <h1>K8s-on-openstack for Rook</h1>
+
+	  <p>A Cinder volume attached to each of the 3 minions for use by Rook</p>
+	  <p>env.sh: </p>
+<pre>
+export NODE_EXTRA_VOLUME="True"
+export NODE_EXTRA_VOLUME_SIZE="80"
+</pre>
+
+	</div>
+
+	<div id="rook-1" class="slide section level1">
+	  <h1>Rook</h1>
+	  <p>Three step process:</p>
+	  <ul>
+	    <li>Common</li>
+	    <li>Operator</li>
+	    <li>Cluster</li>
+	  </ul>
+	</div>
+
+	<div id="rook-operator" class="slide section level1">
+	  <h1>Rook Operator</h1>
+	  <p>An operator handles all the fussy parts of bringing up and managing a Ceph cluster.</p>
+	  <p>Our Ceph cluster is going to be... special.</p>
+	</div>
+
+	<div id="run-rook" class="slide section level1">
+	  <h1>Run Rook</h1>
+	  <p> Install common objects and operator</p>
+	  <center>
+	    <tty-player controls src="recordings/rook-1.ttyrec"></tty-player>
+	  </center>
+	</div>
+
+	<div id="ceph-all-the-way-down" class="slide section level1">
+	  <h1>Ceph All the Way Down</h1>
+	  <p>Vexxhost block devices are backed by Ceph.</p>
+	  <p>If the devices appears to be rotational, Bluestore allocates 64kB chunks by default. Otherwise, it uses 16kB chunks.</p>
+
+<pre>
+Option("bluestore_min_alloc_size_hdd", Option::TYPE_SIZE, Option::LEVEL_ADVANCED)
+.set_default(64_K)
+.set_flag(Option::FLAG_CREATE)
+.set_description("Default min_alloc_size value for rotational media")
+.add_see_also("bluestore_min_alloc_size"),
+
+Option("bluestore_min_alloc_size_ssd", Option::TYPE_SIZE, Option::LEVEL_ADVANCED)
+.set_default(16_K)
+.set_flag(Option::FLAG_CREATE)
+.set_description("Default min_alloc_size value for non-rotational (solid state)  media")
+.add_see_also("bluestore_min_alloc_size"),
+</pre>
+	</div>
+	
+	<div id="ceph-all-the-way-down-1" class="slide section level1">
+	  <h1>Ceph All the Way Down</h1>
+	  <p>Storing lots of small files in a Ceph backed by Ceph, there's no reason to allocate larger chunks:</p>
+<pre>
+---
+apiVersion: v1
+data:
+  config: |
+    [osd]
+    bluestore_min_alloc_size = 4096
+kind: ConfigMap
+metadata:
+  name: rook-config-override
+  namespace: rook-ceph
+</pre>
+	</div>
+
+	<div id="run-rook-1" class="slide section level1">
+	  <h1>Run Rook</h1>
+	  <p> Install our custom config </p>
+	  <center>
+	    <tty-player controls src="recordings/rook-2.ttyrec"></tty-player>
+	  </center>
+	</div>
+
+	<div id="run-rook-1" class="slide section level1">
+	  <h1>Run Rook</h1>
+	  <p> Create the cluster </p>
+	  <center>
+	    <tty-player controls src="recordings/rook-3.ttyrec"></tty-player>
+	  </center>
+	</div>
+
+	<div id="run-rook-1" class="slide section level1">
+	  <h1>Run Rook</h1>
+	  <p> Create the filesystem </p>
+	  <center>
+	    <tty-player controls src="recordings/rook-4.ttyrec"></tty-player>
+	  </center>
+	</div>
+
+	<div id="rook-ran" class="slide section level1">
+	  <h1>Rook Ran</h1>
+	  <ul>
+	    <li>Working Ceph Cluster</li>
+	    <li>Operator used the extra volume on each minion as a Bluestore device</li>
+	    <li>Ceph filesystem</li>
+	  </ul>
+	</div>
+
+	<div id="toolbox" class="slide section level1">
+	  <h1>Toolbox</h1>
+	  <p>To interact with all layers of Ceph (filesystem, Ceph, Rados), use the toolbox.</p>
+	  <ul>
+	    <li>Pod with Ceph tools pre-installed</li>
+	    <li><code>ceph status</code> and friends</li>
+	    <li>Mount filesystem</li>
+	  </ul>
+	</div>
+
+	<div id="run-rook-1" class="slide section level1">
+	  <h1>Toolbox</h1>
+	  <p> Create the toolbox </p>
+	  <center>
+	    <tty-player controls src="recordings/rook-5.ttyrec"></tty-player>
+	  </center>
+	</div>
+
+	<div id="gitea-service-1" class="slide section level1">
+	  <h1>Gitea Service</h1>
+	  <p>Everything is HA.</p>
+	  <p>Dependencies:</p>
+	  <ul>
+	    <li>Shared Filesystem (cephfs)</li>
+	    <li>Database (Percona xtradb)</li>
+	  </ul>
+	</div>
+
+	<div id="percona" class="slide section level1">
+	  <h1>Percona</h1>
+	  <p>Set up Percona XtraDB</p>
+	  <center>
+	    <tty-player controls src="recordings/pxc.ttyrec"></tty-player>
+	  </center>
+	</div>
+
+	<div id="gitea" class="slide section level1">
+	  <h1>Gitea</h1>
+	  <p>Application spec:</p>
+<pre>
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      volumes:
+        - name: gitea-data
+          flexVolume:
+            driver: ceph.rook.io/rook
+            fsType: ceph
+            options:
+              fsName: myfs
+              clusterNamespace: rook-ceph
+              clusterName: rook-ceph
+      containers:
+        - name: gitea
+          volumeMounts:
+            - name: gitea-data
+              mountPath: /data
+</pre>
+	</div>
+
+	<div id="gitea-1" class="slide section level1">
+	  <h1>Gitea</h1>
+	  <p>Set up Gitea</p>
+	  <center>
+	    <tty-player controls src="recordings/gitea.ttyrec"></tty-player>
+	  </center>
+	</div>
+
+	<div id="what-is-opendev" class="slide section level1">
+	  <h1>OpenStack and Kubernetes and Rook</h1>
+	  <p>Free software stack</p>
+	  <p>OpenStack provides backend resources to Kubernetes (Cinder, Octavia)</p>
+	  <p>Kubernetes provides a platform for HA services</p>
+	  <p>Operators like Rook simplify running HA services</p>
+	  <p>Self-deployed at: <a href="https://opendev.org/opendev/system-config/src/branch/master/kubernetes">
+	      https://opendev.org/opendev/system-config/src/branch/master/kubernetes</a></p>
+	</div>

 </body>
 </html>
--- a/recordings/gitea.ttyrec
+++ b/recordings/gitea.ttyrec
--- a/recordings/k8s-1.ttyrec
+++ b/recordings/k8s-1.ttyrec
--- a/recordings/k8s-2.ttyrec
+++ b/recordings/k8s-2.ttyrec
--- a/recordings/pxc.ttyrec
+++ b/recordings/pxc.ttyrec
--- a/recordings/rook-1.ttyrec
+++ b/recordings/rook-1.ttyrec
--- a/recordings/rook-2.ttyrec
+++ b/recordings/rook-2.ttyrec
--- a/recordings/rook-3.ttyrec
+++ b/recordings/rook-3.ttyrec
--- a/recordings/rook-4.ttyrec
+++ b/recordings/rook-4.ttyrec
--- a/recordings/rook-5.ttyrec
+++ b/recordings/rook-5.ttyrec
--- a/scripts/slidy.js
+++ b/scripts/slidy.js
@ -1,6 +1,6 @@
 /* slidy.js

-   Copyright (c) 2005-2010 W3C (MIT, ERCIM, Keio), All Rights Reserved.
+   Copyright (c) 2005-2011 W3C (MIT, ERCIM, Keio), All Rights Reserved.
   W3C liability, trademark, document use and software licensing
   rules apply, see:

@ -160,7 +160,10 @@ var w3c_slidy = {
    // iPhone and iPad, so exclude these from click handler

    if (!this.keyboardless)
+    {
      this.add_listener(document.body, "click", this.mouse_button_click);
+      this.add_listener(document.body, "mousedown", this.mouse_button_down);
+    }

    this.add_listener(document, "keydown", this.key_down);
    this.add_listener(document, "keypress", this.key_press);
@ -285,7 +288,8 @@ var w3c_slidy = {
  hide_table_of_contents: function (focus) {
    w3c_slidy.add_class(w3c_slidy.toc, "hidden");

-    if (focus && !w3c_slidy.opera)
+    if (focus && !w3c_slidy.opera &&
+        !w3c_slidy.has_class(w3c_slidy.toc, "hidden"))
      w3c_slidy.help_anchor.focus();
  },

@ -456,7 +460,7 @@ var w3c_slidy = {
    {
      if (abs_dx > 0.5 * abs_dy)
      {
-        if (dx > 0)
+        if (dx < 0)
          w3c_slidy.next_slide(true);
        else
          w3c_slidy.previous_slide(true);
@ -820,9 +824,9 @@ var w3c_slidy = {
    p1.setAttribute("class", "help");

    if (this.keyboardless)
-      p1.innerHTML = "swipe right to move to next slide";
+      p1.innerHTML = "swipe left to move to next slide";
    else
-      p1.innerHTML = "Space, Right Arrow or swipe right to move to " +
+      p1.innerHTML = "Space, Right Arrow or swipe left to move to " +
                     "next slide, click help below for more details";

    this.add_listener(prompt, "click", function (e) {
@ -1026,12 +1030,20 @@ var w3c_slidy = {

      while (node)
      {
-        if (node.nodeType == 1 &&    // an element
-             (node.nodeName == "H1" ||
-              node.nodeName == "h1" ||
-              node.nodeName == "DIV" ||
-              node.nodeName == "div"))
-          break;
+        if (node.nodeType == 1) // an element
+        {
+           if (node.nodeName == "H1" || node.nodeName == "h1")
+             break;
+
+           if (node.nodeName == "DIV" || node.nodeName == "div")
+           {
+             if (this.has_class(node, "slide"))
+               break;
+
+             if (this.has_class(node, "handout"))
+               break;
+           }
+        }

        next = node.nextSibling;
        node = document.body.removeChild(node);
@ -1214,6 +1226,7 @@ var w3c_slidy = {
  // the iframe with script that set's parent's location.hash
  // but that won't work for standalone use unless we can
  // create the page dynamically via a javascript: URL
+  // ### use history.pushState if available
  set_location: function () {
     var uri = w3c_slidy.page_address(location.href);
     var hash = "#(" + (w3c_slidy.slide_number+1) + ")";
@ -1221,6 +1234,14 @@ var w3c_slidy = {
     if (w3c_slidy.slide_number >= 0)
       uri = uri + hash;

+     if (typeof(history.pushState) != "undefined")
+     {
+       document.title = w3c_slidy.title + " (" + (w3c_slidy.slide_number+1) + ")";
+       history.pushState(0, document.title, hash);
+       w3c_slidy.show_slide_number();
+       return;
+     }
+
     if (w3c_slidy.ie && (w3c_slidy.ie6 || w3c_slidy.ie7))
       w3c_slidy.push_hash(hash);

@ -1706,7 +1727,7 @@ var w3c_slidy = {
    if (!w3c_slidy.ns_pos && !w3c_slidy.ie7)
    {
      w3c_slidy.hide_toolbar();
-      setTimeout(function () {w3c_slidy.show_toolbar(); }, interval);
+      setTimeout(function () {w3c_slidy.show_toolbar();}, interval);
    }
  },

@ -1982,12 +2003,18 @@ var w3c_slidy = {

    if (key == 34) // Page Down
    {
-      w3c_slidy.next_slide(!event.shiftKey);
+      if (w3c_slidy.view_all)
+        return true;
+
+      w3c_slidy.next_slide(false);
      return w3c_slidy.cancel(event);
    }
    else if (key == 33) // Page Up
    {
-      w3c_slidy.previous_slide(!event.shiftKey);
+      if (w3c_slidy.view_all)
+        return true;
+
+      w3c_slidy.previous_slide(false);
      return w3c_slidy.cancel(event);
    }
    else if (key == 32) // space bar
@ -1997,10 +2024,7 @@ var w3c_slidy = {
    }
    else if (key == 37) // Left arrow
    {
-      if (w3c_slidy.view_all)
-        return true;
-
-      w3c_slidy.previous_slide(false);
+      w3c_slidy.previous_slide(!event.shiftKey);
      return w3c_slidy.cancel(event);
    }
    else if (key == 36) // Home
@ -2015,10 +2039,7 @@ var w3c_slidy = {
    }
    else if (key == 39) // Right arrow
    {
-      if (w3c_slidy.view_all)
-        return true;
-
-      w3c_slidy.next_slide(false);
+      w3c_slidy.next_slide(!event.shiftKey);
      return w3c_slidy.cancel(event);
    }
    else if (key == 13) // Enter
@ -2099,7 +2120,31 @@ var w3c_slidy = {
      window.location = w3c_slidy.help_page;
      return w3c_slidy.cancel(event);
    }
-    //else alert("key code is "+ key);
+    else if (key == 116) // f5 play
+    {
+      var all = document.getElementsByTagName("tty-player");
+
+      for (var i = 0, max = all.length; i < max; i++) {
+	  var style = window.getComputedStyle(all[i]);
+	  if (!((style.display === 'none') || (style.visibility === 'hidden'))) {
+              all[i]["play"]();
+	  }
+      }
+      return w3c_slidy.cancel(event);
+    }
+    else if (key == 88) // x pause
+    {
+      var all = document.getElementsByTagName("tty-player");
+
+      for (var i = 0, max = all.length; i < max; i++) {
+	  var style = window.getComputedStyle(all[i]);
+	  if (!((style.display === 'none') || (style.visibility === 'hidden'))) {
+              all[i]["pause"]();
+	  }
+      }
+      return w3c_slidy.cancel(event);
+    }
+    // else alert("key code is "+ key);

    return true;
  },
@ -2485,9 +2530,25 @@ var w3c_slidy = {
    w3c_slidy.selected_text_len = w3c_slidy.get_selected_text().length;
  },

+  mouse_button_down: function (e) {
+    w3c_slidy.selected_text_len = w3c_slidy.get_selected_text().length;
+    w3c_slidy.mouse_x = e.clientX;
+    w3c_slidy.mouse_y = e.clientY;
+  },
+
  // right mouse button click is reserved for context menus
  // it is more reliable to detect rightclick than leftclick
  mouse_button_click: function (e) {
+    if (!e)
+      var e = window.event;
+
+    if (Math.abs(e.clientX -w3c_slidy.mouse_x) +
+        Math.abs(e.clientY -w3c_slidy.mouse_y) > 10)
+      return true;
+
+    if (w3c_slidy.selected_text_len > 0)
+      return true;
+
    var rightclick = false;
    var leftclick = false;
    var middleclick = false;
@ -2554,16 +2615,21 @@ var w3c_slidy = {
    return true;
  },

-  special_element: function (e) {
-    var tag = e.nodeName.toLowerCase();
+  special_element: function (element) {
+    if (this.has_class(element, "non-interactive"))
+      return false;

-    return e.onkeydown ||
-      e.onclick ||
+    var tag = element.nodeName.toLowerCase();
+
+    return element.onkeydown ||
+      element.onclick ||
      tag == "a" ||
      tag == "embed" ||
      tag == "object" ||
      tag == "video" ||
      tag == "audio" ||
+      tag == "svg" ||
+      tag == "canvas" ||
      tag == "input" ||
      tag == "textarea" ||
      tag == "select" ||
--- a/scripts/term.min.js
+++ b/scripts/term.min.js
--- a/scripts/tty-player.min.js
+++ b/scripts/tty-player.min.js
@ -0,0 +1,26 @@
+(function(){function G(a){return a instanceof Array||!q?decodeURIComponent(Array.prototype.map.call(a,function(a){return"%"+("0"+a.toString(16)).substr(-2)}).join("")):q.decode(a)}function y(a){a=/^data:([^,]*),([^#]+)/.exec(a);if(null===a)return null;var b=decodeURIComponent(a[2]),d=a[1].replace(/;base64$/,"");return[d,d===a[1]?b:atob(b)]}function H(a){if(!a)return{type:null};switch(/^(?:(.*):)?/.exec(a)[1]){case "npt":return(a=(a=/^(?:npt:)?(?:(?:(\d+):)?(\d+):)?(\d+(?:\.\d+)?)$/i.exec(a))?3600*
+(a[1]||0)+60*(a[2]||0)+a[3]:null)?{type:"npt",time:a}:{type:null};case "data":if(a=y(a),/^text\/plain$/i.test(a[0]))return{type:"text",data:a[1]}}return{type:null}}function E(a){a|=0;var b=a/60|0;a=("0"+a%60).substr(-2);if(60<=b){var d=b/60|0,b=("0"+b%60).substr(-2);return d+":"+b+":"+a}return b+":"+a}function m(a){return{get:function(){return this.hasAttribute(a)},set:function(b){b?this.setAttribute(a,""):this.removeAttribute(a)}}}function I(a){function b(a,b){f.label=a;f.icon="data:image/svg+xml,%3C?xml version='1.0' encoding='UTF-8' standalone='no'?%3E%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16'%3E%3Cpath stroke='%23999' stroke-width='1' fill='%23eee' d='"+
+b+"'/%3E%3C/svg%3E"}function d(){b("Play","m2.5,2 0,12 11,-6z")}var c=document.createElement("menu");if(!("type"in c))return null;try{c.type="context"}catch(e){}if("context"!==c.type)return null;c.id="treplay-contextmenu-"+J++;var f=document.createElement("menuitem");f.onclick=function(){a.paused?a.play():a.pause()};d();a.addEventListener("play",function(){b("Pause","m2.5,1.5 0,13 4,0 0,-13zm7,0 0,13 4,0 0,-13z")});a.addEventListener("pause",d);var n=document.createElement("menuitem");c.aa=function(){n.label=
+a.controls?"Hide Controls":"Show Controls"};c.aa();n.onclick=function(){a.controls=!a.controls};c.appendChild(f);c.appendChild(n);return c}function F(a){this.B=a}var q="TextDecoder"in window?new TextDecoder:null,r,k;r=function(a){Object.defineProperty(this,"code",{value:a})};r.prototype=Object.create(MediaError.prototype);var l=document.createElement("video").played;k=function(a){Object.defineProperty(this,"length",{value:a.length});this._=a};k.prototype=Object.create(TimeRanges.prototype);k.prototype.start=
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+4:["MEDIA_ERR_SRC_NOT_SUPPORTED","The media resource indicated by the \u001b[4msrc\u001b[24m attribute was not suitable."]},J=0,L=Terminal.prototype.reset;Terminal.prototype.reset=function(){L.call(this);"useFocus"in this.options&&!this.options.useFocus&&this.showCursor()};var c=F.prototype;c.ga=function(){var a=this,b=a.B;a.N=document.createElement("div");a.N.className="title";b.appendChild(a.N);a.D=new Terminal({useFocus:!1});a.D.on("title",function(a){b.title=a});a.D.open(b);b.addEventListener("error",
+function(){var b=K[a.error.code];a.D.reset();a.D.write("\u001b]2;Error :-(\u0007\r\n\u001b[1mMediaError.\u001b[31m"+b[0]+"\u001b[m (numeric value "+a.error.code+")\r\n\r\n    "+b[1]+"\r\n\r\n(Sorry \u2019bout that.)")});var d=+b.getAttribute("rows"),c=+b.getAttribute("cols");b.resize(0<c?c:b.cols,0<d?d:b.rows);a.defaultPlaybackRate=a.playbackRate=1;a.S=0;a.currentSrc="";a.readyState=0;a.networkState=0;a.paused=!0;a.duration=NaN;a.T=b.getAttribute("window-title")||"";a.V=document.createElement("tty-player-poster");
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+0;0!==a&&this.A("timeupdate");this.data=null;this.duration=NaN}this.playbackRate=this.defaultPlaybackRate;this.error=null;this.fa()};c.fa=function(){var a=this;a.networkState=3;a.J=!0;var b=a.B.getAttribute("src");null===b?a.networkState=0:(a.networkState=2,a.A("loadstart"),""===b?a.X():(b=new URL(b.trim(),a.B.baseURI),a.currentSrc=b.toString(),setTimeout(function(){a.ea()},0)))};c.X=function(){this.error=new r(4);this.networkState=3;this.J=!0;this.A("error")};c.ea=function(){function a(){delete d.W}
+function b(b,c){if(200===b.status){var e;try{var h;if(c){var f=b.responseText;h=[];for(var p=0;p<f.length;p++)h.push(f.charCodeAt(p)&255)}else h=b.response;for(var k=h instanceof Array,f=!0,p=null,m=[],g=0,l=0,r=k?h.length:h.byteLength;g<r;){var z,A,t;if(k)z=h[g]+(h[g+1]<<8)+(h[g+2]<<16)+(h[g+3]<<24),A=h[g+4]+(h[g+5]<<8)+(h[g+6]<<16)+(h[g+7]<<24),t=h[g+8]+(h[g+9]<<8)+(h[g+10]<<16)+(h[g+11]<<24);else{var B=new DataView(h,g);z=B.getUint32(0,!0);A=B.getUint32(4,!0);t=B.getUint32(8,!0)}var w=z+A/1E6,
+g=g+12,u=k?h.slice(g,g+t):new Uint8Array(h,g,t),C;if(f)C=G(u);else{for(var D=u,q=[],v=0;v<D.length;v+=32768)q.push(String.fromCharCode.apply(null,D["subarray"in D?"subarray":"slice"](v,v+32768)));C=q.join("")}u=C;if(12===g){var l=w,x=/^\x1b%(G|@)\x1b\[8;([0-9]+);([0-9]+)t$/.exec(u);x&&(f="G"===x[1],p={rows:+x[2],cols:+x[3]})}w-=l;g+=t;m.push([u,w])}e={ia:1E8<=l?new Date(1E3*l):null,U:p,data:m}}catch(y){a();d.X();return}d.currentTime=0;d.F=0;d.data=e.data;d.duration=0===e.data.length?0:e.data[e.data.length-
+1][1];d.A("durationchange");e.U&&d.B.resize(e.U.cols,e.U.rows);d.readyState=1;d.A("loadedmetadata");0<d.S&&(d.currentTime=d.S);d.S=0;d.A("progress");d.networkState=1;d.A("suspend");d.readyState=4;d.A("loadeddata");d.A("canplay");d.A("canplaythrough");a()}else a(),d.X()}var d=this,c;c=y(d.currentSrc);if(null!==c)b({status:200,responseText:c[1]},!0);else{var e=new XMLHttpRequest;"use-credentials"===d.B.crossOrigin?e.withCredentials=!0:"anonymous"===d.B.crossOrigin&&"mozAnon"in e&&(e.ha=!0);e.onabort=
+a;e.open("GET",d.currentSrc);c=!("responseType"in e);e.responseType="arraybuffer";"arraybuffer"!==e.responseType&&(c=!0);c?(e.overrideMimeType("text/plain; charset=x-user-defined"),e.onreadystatechange=function(){4===e.readyState&&b(e,!0)}):e.onload=e.onerror=function(){b(e,!1)};d.W=e;try{e.send()}catch(f){b(e,void 0)}}};c=Object.create(HTMLElement.prototype);c.createdCallback=function(){this._=new F(this);this._.ga();"none"!==this.preload&&this.load();this.autoplay&&this.play()};c.attributeChangedCallback=
+function(a){"src"===a&&this.hasAttribute("src")?(this.pause(),this.load()):"controls"===a&&this.hasAttribute("controls")?this._.R():"poster"===a&&(this._.J=this._.J)};c.attachedCallback=function(){this._.R()};Object.defineProperties(c,{error:{get:function(){return this._.error}},src:{get:function(){return this._.currentSrc},set:function(a){this.setAttribute("src",a)}},currentSrc:{get:function(){return this._.currentSrc}},crossOrigin:{get:function(){var a=this.getAttribute("crossorigin");return null===
+a||"anonymous"===a||"use-credentials"===a?a:"anonymous"},set:function(a){null===a?this.removeAttribute("crossorigin"):"use-credentials"===a?this.setAttribute("crossorigin",a):this.setAttribute("crossorigin","anonymous")}},NETWORK_EMPTY:{value:0},NETWORK_IDLE:{value:1},NETWORK_LOADING:{value:2},NETWORK_NO_SOURCE:{value:3},networkState:{get:function(){return this._.networkState}},preload:{get:function(){var a=this.getAttribute("preload");return"none"===a||"metadata"===a||"auto"===a?a:"auto"},set:function(a){"none"===
+a||"metadata"===a||"auto"===a?this.setAttribute("metadata",a):this.removeAttribute("metadata")}},buffered:{get:function(){return this.seekable}},HAVE_NOTHING:{value:0},HAVE_METADATA:{value:1},HAVE_CURRENT_DATA:{value:2},HAVE_FUTURE_DATA:{value:3},HAVE_ENOUGH_DATA:{value:4},readyState:{get:function(){return this._.readyState}},seeking:{value:!1},currentTime:{get:function(){return this._.currentTime},set:function(a){if(!this._.data)throw document.createElement("video").currentTime=1,void 0;this._.currentTime=
+Math.max(0,Math.min(a,this.duration));this._.ba()}},duration:{get:function(){return this._.duration}},paused:{get:function(){return this._.paused}},defaultPlaybackRate:{get:function(){return this._.defaultPlaybackRate},set:function(a){a=+a;var b=this._.defaultPlaybackRate!==a;this._.defaultPlaybackRate=a;b&&this._.A("ratechange")}},playbackRate:{get:function(){return this._.playbackRate},set:function(a){a=+a;var b=this._.playbackRate!==a;this._.playbackRate=a;b&&this._.A("ratechange")}},played:{value:l},
+seekable:{get:function(){return 4===this.readyState?new k([0,this.duration]):l}},ended:{get:function(){return this.paused&&this.currentTime===(0>this.playbackRate?0:this.duration)}},autoplay:m("autoplay"),loop:m("loop"),controls:m("controls"),defaultMuted:m("muted"),textTracks:{get:function(){return document.createElement("video").textTracks}},title:{get:function(){return this._.N.textContent},set:function(a){this._.N.textContent=a;this._.A("titlechange")}},defaultTitle:{get:function(){return this._.T},
+set:function(a){this._.T=a;this._.A("titlechange")}},cols:{get:function(){return this._.D.cols}},rows:{get:function(){return this._.D.rows}},poster:{get:function(){return(this.getAttribute("poster")||"").trim()},set:function(a){this.setAttribute("poster",a)}}});c.load=function(){this._.$()};c.canPlayType=function(){return"maybe"};c.play=function(){function a(){c.ended&&(c.currentTime=0>c.playbackRate?c.duration:0);c._.J=!1;c._.paused=!1;var a=new Date;c._.ca=setInterval(function(){var b=new Date;
+c._.I||(c.currentTime+=(b-a)/1E3*c.playbackRate);a=b},16);c._.A("play")}function b(){c.removeEventListener("loadeddata",b);a()}var c=this;this._.paused&&(this._.data?a():(this.addEventListener("loadeddata",b),this._.Z()))};c.pause=function(){this._.paused||(this._.paused=!0,clearInterval(this._.ca),this._.A("pause"))};c.volume=1;c.muted=!1;c.addTextTrack=function(){return null};c.ontitlechange=null;c.resize=function(a,b){this._.D.resize(a,b)};c.pretendToBeAVideo=function(){Object.defineProperties(this,
+{tagName:{value:"VIDEO"},width:{get:function(){return this.offsetWidth},set:function(a){this.style.fontSize="100%";this.style.fontSize=a/this.offsetWidth*100+"%"}},height:{get:function(){return this.offsetHeight},set:function(a){this.style.fontSize="100%";this.style.fontSize=a/this.offsetHeight*100+"%"}},videoWidth:{get:function(){return this.width}},videoHeight:{get:function(){return this.height}}})};document.registerElement("tty-player",{prototype:c})})();
--- a/scripts/webcomponents-lite.min.js
+++ b/scripts/webcomponents-lite.min.js
--- a/styles/local.css
+++ b/styles/local.css
@ -0,0 +1,456 @@
+/* w3c-blue.css
+
+   Copyright (c) 2005-2010 W3C (MIT, ERCIM, Keio), All Rights Reserved.
+   W3C liability, trademark, document use and software licensing
+   rules apply, see:
+
+   http://www.w3.org/Consortium/Legal/copyright-documents
+   http://www.w3.org/Consortium/Legal/copyright-software
+*/
+body
+{
+  margin: 0 0 0 0;
+  padding: 0 0 0 0;
+  width: 100%;
+  height: 100%;
+  color: black;
+  background-color: white;
+  font-family: "Open Sans", OpenSans, sans-serif;
+  font-size: 14pt;
+}
+
+div.slide.titlepage {
+  text-align: center;
+}
+
+div.slide.titlepage h1 {
+  padding-top: 40%;
+}
+
+div.slide {
+  z-index: 20;
+  margin: 0 0 0 0;
+  padding: 0;
+  border-width: 0;
+  top: 0;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  line-height: 120%;
+  background-color: transparent;
+}
+
+div.background {
+  z-index: 1;
+  position: absolute;
+  vertical-align: bottom;
+  left: 0;
+  right: 0;
+  top: 0;
+  bottom: auto;
+  height: 5.0em;
+  padding: 0 0 0 0.2em;
+  margin: 0 0 0 0;
+  background-color: #fff;
+  border-bottom: solid 3px #ee265e; /* #071d49; */
+}
+
+div.background img {
+  height: 4em;
+}
+
+/* this rule is hidden from IE which doesn't support + selector */
+div.slide + div[class].slide { page-break-before: always;}
+
+div.slide h1 {
+  padding-right: 3em;
+  padding-top: 1em;
+  margin-bottom: 1.2em;
+  margin-left: 5em;
+  margin-right: 0;
+  min-height: 2.3em;
+  color: #ee265e; /* #071d49; */
+  height: 2.2em;
+  font-size: 160%;
+  line-height: 1.1em;
+}
+
+div.slide h1 a {
+  color: white;
+  text-decoration: none;
+}
+
+div.slide h1 a:link {
+  color: white;
+  text-decoration: none;
+}
+
+div.slide h1 a:visited {
+  color: white;
+  text-decoration: none;
+}
+
+div.slide h1 a:hover {
+  color: white;
+  text-decoration: underline;
+}
+
+div.slide h1 a:active {
+  color: red;
+  text-decoration: underline;
+}
+
+#head-logo {
+  margin: 0;
+  margin-top: 0.25em;
+  padding-top: 0.3em;
+  padding-bottom: 0.2em;
+  padding-left: .3em;
+  padding-right: 0;
+  height: 3.8em;
+  width: 5.8em;
+  float: left;
+  z-index: 2;
+}
+
+#head-logo-fallback {
+  margin: 0;
+  padding: 0;
+  margin-top: -0.8em;
+  width: 4.8em;
+  float: right;
+  z-index: 2;
+}
+
+/* the next two classes support vertical and horizontal centering */
+div.vbox {
+  float: left;
+  height: 40%;
+  width: 50%;
+  margin-top: -240px;
+}
+div.hbox {
+  width:60%;
+  margin-top: 0;
+  margin-left:auto;
+  margin-right:auto;
+  height: 60%;
+  border:1px solid silver;
+  background:#F0F0F0;
+  overflow:auto;
+  text-align:left;
+  clear:both;
+}
+
+/* styling for named background */
+div.background.slanty {
+  z-index: 2;
+  bottom: 0; 
+  height: 100%;
+  background: transparent;
+}
+
+div.background.slanty img { margin-top: 4em; width: 100%; height: 80% }
+
+/* the following makes the pre background translucent */
+/* opacity is a CSS3 property but supported by Mozilla family */
+/* filter is an IE specific feature that also requires width */
+div.slide.slanty pre {
+  width: 93%;  /* needed for IE filter to work */
+  opacity: .8;
+  filter: alpha(opacity=80);
+}
+
+img.withBorder {
+  border: 2px solid #c60;
+  padding: 4px;
+}
+
+li pre { margin-left: 0; }
+
+@media print { pre { font-size: 60% } }
+
+blockquote { font-style: italic }
+
+img { background-color: transparent }
+
+p.copyright { font-size: smaller }
+
+.center { text-align: center }
+.footnote { font-size: smaller; margin-left: 2em; }
+
+a img { border-width: 0; border-style: none }
+
+a:visited { color: navy }
+a:link { color: navy }
+a:hover { color: red; text-decoration: underline }
+a:active { color: red; text-decoration: underline }
+
+a {text-decoration: none}
+.navbar a:link {color: white}
+.navbar a:visited {color: yellow}
+.navbar a:active {color: red}
+.navbar a:hover {color: red}
+
+ul { list-style-type: square; }
+ul ul { list-style-type: disc; }
+ul ul ul { list-style-type: circle; }
+ul ul ul ul { list-style-type: disc; }
+li { margin-left: 0.5em; margin-top: 0.5em; }
+li li { font-size: 85%; font-style: italic }
+li li li { font-size: 85%; font-style: normal }
+
+div dt
+{
+  margin-left: 0;
+  margin-top: 1em;
+  margin-bottom: 0.5em;
+  font-weight: bold;
+}
+div dd
+{
+  margin-left: 2em;
+  margin-bottom: 0.5em;
+}
+
+
+p,pre,ul,ol,blockquote,h2,h3,h4,h5,h6,dl,table {
+  margin-left: 1.4em;
+  margin-right: 1em;
+}
+
+p.subhead { font-weight: bold; margin-top: 2em; }
+
+div.cover p.explanation {
+  font-style: italic;
+  margin-top: 3em;
+}
+
+
+.smaller { font-size: smaller }
+
+td,th { padding: 0.2em }
+
+ul {
+  margin: 0.5em 1.5em 0.5em 1.5em;
+  padding: 0;
+}
+
+ol {
+  margin: 0.5em 1.5em 0.5em 1.5em;
+  padding: 0;
+}
+
+ul { list-style-type: square; }
+ul ul { list-style-type: disc; }
+ul ul ul { list-style-type: circle; }
+ul ul ul ul { list-style-type: disc; }
+li { margin-left: 0.5em; margin-top: 0.5em; }
+li li { font-size: 85%; font-style: italic }
+li li li { font-size: 85%; font-style: normal }
+
+
+ul li { 
+  list-style: none;
+  margin: 0.1em 0em 0.6em 0;
+  padding: 0 0 0 40px;
+  background: transparent url(../graphics/bullet.png) no-repeat 5px 0.3em;
+  line-height: 140%;
+}
+
+/* workaround IE's failure to support background on li for print media */
+@media print { ul li { list-style: disc; padding-left: 0; background: none; } }
+
+ol li { 
+  margin: 0.1em 0em 0.6em 1.5em;
+  padding: 0 0 0 0px;
+  line-height: 140%;
+}
+
+li li { 
+  font-size: 85%; 
+  font-style: italic;
+  list-style-type: disc;
+  background: transparent;
+  padding: 0 0 0 0;
+}
+li li li { 
+  font-size: 85%; 
+  font-style: normal;
+  list-style-type: circle;
+  background: transparent;
+  padding: 0 0 0 0;
+}
+li li li li {
+  list-style-type: disc;
+  background: transparent;
+  padding: 0 0 0 0;
+}
+
+/* rectangular blue bullet + unfold/nofold/fold widget */
+
+/*
+ setting class="outline on ol or ul makes it behave as an
+ ouline list where blocklevel content in li elements is
+ hidden by default and can be expanded or collapsed with
+ mouse click. Set class="expand" on li to override default
+*/
+
+ol.outline li:hover { cursor: pointer }
+ol.outline li.nofold:hover { cursor: default }
+
+ul.outline li:hover { cursor: pointer }
+ul.outline li.nofold:hover { cursor: default }
+
+ol.outline { list-style:decimal; }
+ol.outline ol { list-style-type:lower-alpha }
+
+ol.outline li.nofold {
+  padding: 0 0 0 20px;
+  background: transparent url(../graphics/nofold-dim.gif) no-repeat 0px 0.3em;
+}
+ol.outline li.unfolded {
+  padding: 0 0 0 20px;
+  background: transparent url(../graphics/fold-dim.gif) no-repeat 0px 0.3em;
+}
+ol.outline li.folded {
+  padding: 0 0 0 20px;
+  background: transparent url(../graphics/unfold-dim.gif) no-repeat 0px 0.3em;
+}
+ol.outline li.unfolded:hover {
+  padding: 0 0 0 20px;
+  background: transparent url(../graphics/fold.gif) no-repeat 0px 0.3em;
+}
+ol.outline li.folded:hover {
+  padding: 0 0 0 20px;
+  background: transparent url(../graphics/unfold.gif) no-repeat 0px 0.3em;
+}
+
+ul.outline li.nofold {
+  padding: 0 0 0 52px;
+  background: transparent url(../graphics/bullet-nofold-dim.gif) no-repeat 5px 0.3em;
+}
+ul.outline li.unfolded {
+  padding: 0 0 0 52px;
+  background: transparent url(../graphics/bullet-fold-dim.gif) no-repeat 5px 0.3em;
+}
+ul.outline li.folded {
+  padding: 0 0 0 52px;
+  background: transparent url(../graphics/bullet-unfold-dim.gif) no-repeat 5px 0.3em;
+}
+ul.outline li.unfolded:hover {
+  padding: 0 0 0 52px;
+  background: transparent url(../graphics/bullet-fold.gif) no-repeat 5px 0.3em;
+}
+ul.outline li.folded:hover {
+  padding: 0 0 0 52px;
+  background: transparent url(../graphics/bullet-unfold.gif) no-repeat 5px 0.3em;
+}
+
+li ul.outline li.nofold {
+  padding: 0 0 0 21px;
+  background: transparent url(../graphics/nofold-dim.gif) no-repeat 5px 0.3em;
+}
+li ul.outline li.unfolded {
+  padding: 0 0 0 21px;
+  background: transparent url(../graphics/fold-dim.gif) no-repeat 5px 0.3em;
+}
+li ul.outline li.folded {
+  padding: 0 0 0 21px;
+  background: transparent url(../graphics/unfold-dim.gif) no-repeat 5px 0.3em;
+}
+li ul.outline li.unfolded:hover {
+  padding: 0 0 0 21px;
+  background: transparent url(../graphics/fold.gif) no-repeat 5px 0.3em;
+}
+li ul.outline li.folded:hover {
+  padding: 0 0 0 21px;
+  background: transparent url(../graphics/unfold.gif) no-repeat 5px 0.3em;
+}
+
+img {
+  image-rendering: optimize-quality;
+}
+
+img.withBorder {
+  border: 2px solid #c60;
+  padding: 4px;
+}
+
+div.header {
+  position: absolute;
+  z-index: 2;
+  left: 0;
+  right: 0;
+  top: 0;
+  bottom: auto;
+  height: 2.95em;
+  width: 100%;
+  padding: 0 0 0 0;
+  margin: 0 0 0 0;
+  border-width: 0;
+  border-style: solid;
+  background-color: #005A9C;
+  border-bottom-width: thick;
+  border-bottom-color: #95ABD0;
+}
+
+div.footer {
+  position: absolute;
+  z-index: 80;
+  left: 0;
+  right: 0;
+  top: auto;
+  bottom: 0;
+  height: 3.5em;
+  margin: 0;
+  font-size: 80%;
+  font-weight: bold;
+  padding-left: 1em;
+  padding-right: 0;
+  padding-top: 0.3em;
+  padding-bottom: 0;
+  color: #003366;
+  background-color: #95ABD0;
+}
+
+/* this is a hack to hide property from IE6 and below */
+div[class="footer"] {
+  position: fixed;
+}
+
+#hidden-bullet {
+  visibility: hidden;
+  display: none;
+}
+
+div.slide.cover {
+  padding-top: 0;
+  padding-right: 0;
+}
+
+div.slide.cover h1 {
+  margin-top:3em;
+  height: auto;
+}
+
+#cover {
+  /* background-image: url("../graphics/banner.jpg"); */
+  background-position: center center;
+  background-size: cover;
+  height: 18em;
+  text-align: center;
+  position: relative;
+  margin-top: 6.0em;
+}
+
+/* for Bert as an ardent user of the old W3C slidemaker tool */
+
+div.comment { display: none; visibility: hidden }
+
+@media print {
+ div.slide h1 { background: transparent; color: black }
+ div.slide.cover { background: transparent; color: black }
+ div.slide.cover h1 { background: transparent; color: black }
+ div.comment { display: block; visibility: visible } 
+}
--- a/styles/slidy.css
+++ b/styles/slidy.css
@ -160,6 +160,10 @@ div.toc-heading {
  text-align: center;
 }

+img {
+  image-rendering: optimize-quality;
+}
+
 pre {
 font-size: 80%;
 font-weight: bold;
--- a/styles/tty-player.css
+++ b/styles/tty-player.css
@ -0,0 +1,223 @@
+.terminal {
+	font-family: monospace, monospace;
+	cursor: text;
+	line-height: initial;
+	font-size: 12pt;
+}
+.terminal-cursor {
+    background: #00ff00;
+    color: black;
+}
+
+tty-player {
+	border: 2px solid #285577;
+	border-top: 1px solid #4c7899;
+}
+
+tty-player .title {
+	background: #285577;
+	border-bottom: 1px solid #4c7899;
+	color: #fff;
+	font-family: sans-serif;
+	font-weight: bold;
+	padding: 0.2em;
+	line-height: 1;
+	height: 1em;
+	cursor: default;
+}
+
+tty-player menu {
+	display: none;
+}
+
+tty-player {
+	display: inline-block;
+	position: relative;
+}
+
+tty-player:not([controls]) tty-player-controls {
+	display: none;
+}
+
+tty-player-poster {
+	/* XXX: <video> has an overlay with play button if [controls] over the poster *image*, but here we have an overlay with play button regardless. Perhaps specifying a poster currentTime or script might work? */
+	background: rgba(53, 47, 47, 0.5);
+	opacity: 0.5;
+	transition: opacity 0.2s linear;
+	background-repeat: no-repeat;
+	background-position: center;
+	background-image: url("data:image/svg+xml,%3C?xml%20version='1.0'%20encoding='UTF-8'%20standalone='no'?%3E%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='66'%20height='66'%3E%3Cfilter%20id='f'%3E%3CfeColorMatrix%20type='matrix'%20values='0%200%200%200%200%200%200%200%200%200%200%200%200%200%200%200%200%200%20.5%200'/%3E%3CfeGaussianBlur%20result='r'%20stdDeviation='2'/%3E%3CfeComposite%20in='SourceGraphic'%20in2='r'/%3E%3C/filter%3E%3Cpath%20fill='%23ddd'%20stroke='%23ccc'%20stroke-width='1'%20d='M33,5.5A27.5,27.5%200%200%200%205.5,33%2027.5,27.5%200%200%200%2033,60.5%2027.5,27.5%200%200%200%2060.5,33%2027.5,27.5%200%200%200%2033,5.5Zm-9.5,13%2025,14.5-25,14.5%200,-29z'%20filter='url(%23f)'/%3E%3C/svg%3E");
+	position: absolute;
+	top: 0;
+	left: 0;
+	right: 0;
+	bottom: 0;
+}
+
+tty-player[controls] tty-player-poster {
+	bottom: 28px;
+}
+
+tty-player:hover tty-player-poster {
+	opacity: 1;
+}
+
+tty-player-controls {
+	position: absolute;
+	left: 0;
+	right: 0;
+	bottom: 0;
+	background: rgba(53, 47, 47, 0.5);
+	opacity: 0;
+	display: flex;
+	flex-direction: row;
+	transition: opacity 0.2s linear;
+	cursor: default;
+}
+
+/* Browsers tend to show the controls when a <video> ends, too; I, however, am not doing this for now at least as the controls will overlap with what is often the most important part of the terminal (the bottom). For this reason, I haven’t hooked up any support for that either, only showing controls persistently when the poster is up. */
+tty-player-controls.poster,
+tty-player:hover tty-player-controls {
+	opacity: 1;
+}
+
+tty-player-controls input[type=range], tty-player-controls button {
+	margin: 0;
+	padding: 0;
+	border: none;
+	background: none;
+	font: inherit;
+	line-height: inherit;
+	-moz-appearance: none;
+	-webkit-appearance: none;
+}
+
+tty-player-controls button {
+	padding: 0;
+	background: none;
+	opacity: 0.75;
+	flex: 0 1 auto;
+	line-height: 1;
+	width: 28px;
+	height: 28px;
+}
+
+tty-player-controls button:hover {
+	color: #777;
+	opacity: 1;
+}
+
+tty-player-controls input[type=range] {
+	flex: 1;
+	height: 8px;
+	margin: 10px 5px;
+}
+
+tty-player-controls button {
+	background-repeat: no-repeat;
+	background-position: center;
+}
+
+tty-player-controls button.play {
+	background-image: url("data:image/svg+xml,%3C?xml%20version='1.0'%20encoding='UTF-8'%20standalone='no'?%3E%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='14'%20height='16'%3E%3Cpath%20fill='%23ccc'%20d='M0,0%200,16%2014,8Z'/%3E%3C/svg%3E");
+}
+
+tty-player-controls button.pause {
+	background-image: url("data:image/svg+xml,%3C?xml%20version='1.0'%20encoding='UTF-8'%20standalone='no'?%3E%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20width='14'%20height='16'%3E%3Cpath%20fill='%23ccc'%20d='M1,0L1,16L5,16L5,0L0,0zM9,0L9,16L13,16L13,0L9,0z'/%3E%3C/svg%3E");
+}
+
+tty-player-controls input[type=range]:focus {
+	box-shadow: none;
+	outline: none;
+}
+
+tty-player-controls input[type=range]::-moz-range-track,
+tty-player-controls input[type=range]::-moz-range-thumb,
+tty-player-controls input[type=range]::-moz-range-progress {
+	border-radius: 4px;
+	height: 8px;
+}
+
+tty-player-controls input[type=range]::-moz-range-track {
+	background: rgba(255, 255, 255, 0.5);
+}
+
+tty-player-controls input[type=range]::-moz-range-thumb {
+	-moz-appearance: none;
+	width: 0;
+	background: transparent;
+	border: 0;
+	border-radius: 0;
+	box-shadow: 0;
+	position: relative;
+}
+
+tty-player-controls input[type=range]::-moz-range-progress {
+	background: #fff;
+}
+
+input[type=range] {
+	overflow: hidden;
+}
+
+tty-player-controls input[type=range]::-webkit-slider-runnable-track {
+	-webkit-appearance: none;
+	height: 8px;
+	background: rgba(255, 255, 255, 0.5);
+	//border-radius: 4px;
+}
+
+tty-player-controls input[type=range]::-webkit-slider-thumb:before {
+	position: absolute;
+	top: 0;
+	right: 50%;
+	left: -9999px;
+	background: #fff;
+	content: '';
+	height: 8px;
+	pointer-events: none;
+}
+
+tty-player-controls input[type=range]::-webkit-slider-thumb {
+	-webkit-appearance: none;
+	width: 0;
+	height: 0;
+	position: relative;
+}
+
+/* I have not altered IE’s styles because I feel them already satisfactory */
+
+tty-player-controls .current-time {
+	position: absolute;
+	color: #ddd;
+	background: #888;
+	font-family: sans-serif;
+	font-size: 12px;
+	display: block;
+	box-shadow: 0 1px rgba(0, 0, 0, 0.5), 0 1px 2px rgba(0, 0, 0, 0.5), inset 0 1px rgba(255, 255, 255, 0.2);
+	padding: 0 5px;
+	line-height: 16px;
+	border-radius: 4px;
+	top: -7px;
+}
+
+tty-player-controls .current-time::after {
+	content: "";
+	position: absolute;
+	width: 8px;
+	height: 8px;
+	background: linear-gradient(-45deg, #888 50%, transparent 50%);
+	box-shadow: 1px 1px rgba(0, 0, 0, 0.5), 1px 1px 1px rgba(0, 0, 0, 0.5);
+	bottom: -3px;
+	left: 50%;
+	margin-left: -5px;
+	transform: rotate(45deg);
+}
+
+tty-player-controls .duration {
+	font-family: sans-serif;
+	font-size: 12px;
+	color: #999;
+	line-height: 18px;
+	padding: 5px;
+}