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<!DOCTYPE html><html lang="en-US"><head><title>Explode the Web!</title><meta property="og:title" content="Explode the Web!"><meta name="author" content="Owen Mundy"><meta property="article:author" content="Owen Mundy"><meta name="keywords" content="computing,proficiency,browser extensions"><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button{-webkit-tap-highlight-color:transparent;-webkit-appearance:none;appearance:none;background-color:initial;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:disabled,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:disabled,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:disabled,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button:disabled{cursor:not-allowed;opacity:.15!important}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:hover,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:hover,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:hover,body[data-bespoke-view=presenter] 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/*!
* Marp default theme.
*
* @theme default
* @author Yuki Hattori
*
* @auto-scaling true
* @size 16:9 1280px 720px
* @size 4:3 960px 720px
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.contains-task-list{position:relative}div#\:\$p>svg>foreignObject>section .contains-task-list:focus-within .task-list-item-convert-container,div#\:\$p>svg>foreignObject>section .contains-task-list:hover .task-list-item-convert-container{clip:auto;display:block;height:24px;overflow:visible;width:auto}div#\:\$p>svg>foreignObject>section ::-webkit-calendar-picker-indicator{filter:invert(50%)}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1){color:var(--h1-color);font-size:1.6em}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1),div#\:\$p>svg>foreignObject>section :is(h2,marp-h2){border-bottom:none}div#\:\$p>svg>foreignObject>section :is(h2,marp-h2){font-size:1.3em}div#\:\$p>svg>foreignObject>section :is(h3,marp-h3){font-size:1.1em}div#\:\$p>svg>foreignObject>section :is(h4,marp-h4){font-size:1.05em}div#\:\$p>svg>foreignObject>section :is(h5,marp-h5){font-size:1em}div#\:\$p>svg>foreignObject>section :is(h6,marp-h6){font-size:.9em}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1) 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<h1 id="img-width4-srcextensionexplode-tutorial-finalassetsimgexplosion-iconsvg-1--hello-world"><img width="4%" src="../../extension/explode-tutorial-final/assets/img/explosion-icon.svg" /> 1- Hello World!</h1>
<p><span class="slides-small"><a href="../slides/1-hello-world.html">slides</a> | <span class="slides-small"><a href="../markdown/1-hello-world.md">markdown</a> | <a href="../www/1-hello-world.html">HTML</a></span></p>
<p><span class="slides-small"><a href="../../README.md">⌂</a> | <a href="0-introduction.html">0-Introduction</a> | <a href="1-hello-world.html">1-Hello World!</a> | <a href="2-architecture.html">2-Architecture</a> | <a href="3-dom.html">3-DOM</a> | <a href="4-explosion.html">4-Explosion</a> | <a href="5-examples.html">5-Examples</a></span></p>
<ol>
<li>HTML, CSS, and Javascript</li>
<li>Create manifest.json</li>
<li>Load an extension</li>
<li>Edit and refresh an extension</li>
<li>Next steps</li>
</ol>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-paginate="true" data-theme="owen" data-marpit-pagination="2" data-marpit-pagination-total="7" style="--paginate:true;--theme:owen;">
<h2 id="html-css-javascript">HTML, CSS, Javascript</h2>
<div class="twocolumn">
<div class="col">
<ul>
<li>Like all web pages, extensions are built using HTML, CSS, and Javascript code.</li>
<li><a target="_blank" href="https://www.w3schools.com/html/default.asp">HTML</a> (HyperText Markup Language) structures content for the web.</li>
<li><a target="_blank" href="https://www.w3schools.com/css/default.asp">CSS</a> (Cascading StyleSheets) control the presentation of content.</li>
<li><a target="_blank" href="https://www.w3schools.com/js/default.asp">JS</a> (Javascript) is the programming language for web pages.</li>
<li>This simple example will look like:</li>
</ul>
<blockquote>
<p>This is a <span style="color:red">paragraph</span></p>
</blockquote>
</div>
<div class="col">
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-html"><span class="hljs-comment"><!-- hello.html --></span>
<span class="hljs-tag"><<span class="hljs-name">html</span>></span>
<span class="hljs-tag"><<span class="hljs-name">head</span>></span>
<span class="hljs-tag"><<span class="hljs-name">title</span>></span>Hello world!<span class="hljs-tag"></<span class="hljs-name">title</span>></span>
<span class="hljs-tag"><<span class="hljs-name">link</span> <span class="hljs-attr">rel</span>=<span class="hljs-string">"stylesheet"</span> <span class="hljs-attr">href</span>=<span class="hljs-string">"styles.css"</span>></span>
<span class="hljs-tag"><<span class="hljs-name">body</span>></span>
<span class="hljs-tag"><<span class="hljs-name">h1</span>></span>Hello world!<span class="hljs-tag"></<span class="hljs-name">h1</span>></span>
<span class="hljs-tag"><<span class="hljs-name">p</span>></span>This is a <span class="hljs-tag"><<span class="hljs-name">span</span> <span class="hljs-attr">style</span>=<span class="hljs-string">"color:red"</span>></span>paragraph<span class="hljs-tag"></<span class="hljs-name">span</span>></span><span class="hljs-tag"></<span class="hljs-name">p</span>></span>
<span class="hljs-tag"><<span class="hljs-name">script</span> <span class="hljs-attr">src</span>=<span class="hljs-string">"main.js"</span>></span><span class="hljs-tag"></<span class="hljs-name">script</span>></span>
<span class="hljs-tag"></<span class="hljs-name">body</span>></span>
<span class="hljs-tag"></<span class="hljs-name">html</span>></span>
</code></pre>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-css"><span class="hljs-comment">/* styles.css */</span>
<span class="hljs-selector-tag">span</span> { <span class="hljs-attribute">color</span>: red; }
</code></pre>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-js"><span class="hljs-comment">// main.js</span>
<span class="hljs-title function_">alert</span>(<span class="hljs-string">"This is a simple Javascript alert"</span>);
</code></pre>
</div>
</div>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-paginate="true" data-theme="owen" data-marpit-pagination="3" data-marpit-pagination-total="7" style="--paginate:true;--theme:owen;">
<h2 id="%F0%9F%91%89-create-the-manifest-file"><img class="emoji" draggable="false" alt="👉" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f449.svg" data-marp-twemoji=""/> Create the manifest file</h2>
<p>The <a target="_blank" href="https://developer.chrome.com/docs/extensions/mv3/manifest/">manifest file</a> tells the browser how to install and run the extension code.</p>
<div class="twocolumn">
<div class="col">
<ol>
<li>Create a new folder and call it <code>explode-tutorial</code></li>
<li>Create a new file <code>manifest.json</code> inside this folder.</li>
<li>Paste or type the example.</li>
<li>Install the extension in your browser using the instructions below.</li>
</ol>
</div>
<div class="col">
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">{</span>
<span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"My First Browser Extension"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"description"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"<img class="emoji" draggable="false" alt="🐌" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f40c.svg" data-marp-twemoji=""/>"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"version"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"1.1.0"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"manifest_version"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">3</span>
<span class="hljs-punctuation">}</span>
</code></pre>
<div class="slides-small caption">We are using Manifest version 3, which is now required for all new published extensions.</div>
</div>
</div>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-paginate="true" data-theme="owen" data-marpit-pagination="4" data-marpit-pagination-total="7" style="--paginate:true;--theme:owen;">
<h2 id="%F0%9F%91%89-install-an-extension-for-development"><img class="emoji" draggable="false" alt="👉" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f449.svg" data-marp-twemoji=""/> Install an extension for development</h2>
<div class="twocolumn">
<div class="col">
<h4 id="chromium-browsers">Chromium Browsers</h4>
<ol>
<li>Go to <code>chrome://extensions</code></li>
<li>Enable Developer mode by toggling the checkbox in the upper-right corner.</li>
<li>Click "Load unpacked" and select the folder with your extension manifest file.</li>
</ol>
</div>
<div class="col">
<h4 id="a-target_blank-hrefhttpsdevelopermozillaorgen-usdocsmozillaadd-onswebextensionsyour_first_webextensioninstallingmozilla-firefoxa"><a target="_blank" href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Your_first_WebExtension#installing">Mozilla Firefox</a></h4>
<ol>
<li>Go to <code>about:debugging</code>.</li>
<li>Click "This Firefox".</li>
<li>Click "Load Temporary Add-on" and select any file in your extension folder.</li>
<li>The extension will remain installed until you restart Firefox.</li>
</ol>
</div>
</div>
<div class="slides-small caption">We are building a "cross-browser extension" so, from this point instructions refer to Chromium browsers (Chrome, Brave, Opera, Edge, <a target="_blank" href="https://en.wikipedia.org/wiki/Chromium_(web_browser)#Browsers_based_on_Chromium">and others</a>), but it will work fine in <a target="_blank" href="https://developer.chrome.com/docs/extensions/mv3/getstarted/">Chrome</a> or <a target="_blank" href="https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions">Firefox</a>.</div>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-paginate="true" data-theme="owen" data-marpit-pagination="5" data-marpit-pagination-total="7" style="--paginate:true;--theme:owen;">
<h2 id="%F0%9F%91%89-confirm-the-extension-has-loaded"><img class="emoji" draggable="false" alt="👉" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f449.svg" data-marp-twemoji=""/> Confirm the extension has loaded</h2>
<div class="twocolumn">
<div class="col">
<ol>
<li>Confirm your extension has loaded at <code>chrome://extensions</code></li>
<li>Examine the panel for your extension to see the name, description, and version from your manifest file.</li>
<li>Notice also the enable|disable toggle and reload button.</li>
</ol>
</div>
<div class="col">
<img width="550" src="../figures/tutorial-2022/1-1-installed.png" />
<div class="slides-small caption">Note that, "unpacked" simply means the folder and files have not yet been zipped to upload and distribute on Chrome or Firefox platforms. You can recognize unpacked extensions by the orange "hard drive" icon.</div>
</div>
</div>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-paginate="true" data-theme="owen" data-marpit-pagination="6" data-marpit-pagination-total="7" style="--paginate:true;--theme:owen;">
<h2 id="%F0%9F%91%89-edit-and-refresh-an-extension"><img class="emoji" draggable="false" alt="👉" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f449.svg" data-marp-twemoji=""/> Edit and refresh an extension</h2>
<p>These are basic steps you repeat will to build and test any extension. Try updating your manifest to match the example.</p>
<div class="twocolumn">
<div class="col">
<ol>
<li>Edit and save the extension files in your code editor.</li>
<li>Click the small "refresh" button at <code>chrome://extensions</code> to reload the extension.</li>
<li>Normally you'll refresh a test page to run the extension on that page. Let's add one now.</li>
</ol>
</div>
<div class="col">
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-json"><span class="hljs-punctuation">{</span>
<span class="hljs-attr">"name"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"Explode the Web! Tutorial"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"description"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"<img class="emoji" draggable="false" alt="🐢" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f422.svg" data-marp-twemoji=""/>"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"version"</span><span class="hljs-punctuation">:</span> <span class="hljs-string">"1.1.1"</span><span class="hljs-punctuation">,</span>
<span class="hljs-attr">"manifest_version"</span><span class="hljs-punctuation">:</span> <span class="hljs-number">3</span>
<span class="hljs-punctuation">}</span>
</code></pre>
<div class="slides-small caption">You may have probably aleady noticed that the 👉 emoji lets you know there are steps to complete.</div>
</div>
</div>
</section>
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<h2 id="part-1-conclusion">Part 1 conclusion</h2>
<ul>
<li>So far we have created a project folder and manifest, and learned how to load, update, and refresh the extension in Chrome.</li>
<li>You check your progress by looking at the completed files for each section, for example in <code>extensions/explode-tutorial-1</code>.</li>
<li><img class="emoji" draggable="false" alt="👉" src="https://cdn.jsdelivr.net/gh/jdecked/twemoji@14.1.2/assets/svg/1f449.svg" data-marp-twemoji=""/> Start the next section <a href="2-architecture.html">Architecture and Debugging</a></li>
</ul>
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