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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="generator" content="MarkBind 6.3.1">
<meta name="viewport" content="width=device-width, initial-scale=1"><title>CustardUI - Your docs, shaped for every reader</title> <link rel="stylesheet" href="/devdocs/markbind/css/bootstrap.min.css"> <link rel="stylesheet" href="/devdocs/markbind/fontawesome/css/all.min.css"><link rel="stylesheet" href="/devdocs/markbind/css/codeblock-light.min.css"><link rel="stylesheet" href="/devdocs/markbind/css/markbind.min.css"><link rel="stylesheet" href="/devdocs/plugins/codeBlockCopyButtons/codeBlockButtons.css"><link rel="stylesheet" href="/devdocs/plugins/codeBlockWrapButtons/codeBlockButtons.css"><link rel="stylesheet" href="/devdocs/plugins/markbind-plugin-anchors/markbind-plugin-anchors.css"><link rel="stylesheet" href="/devdocs/plugins/markbind-plugin-tree/markbind-plugin-tree.css">
<link rel="stylesheet" href="/devdocs/stylesheets/main.css">
<link rel="stylesheet" href="/devdocs/stylesheets/custard.css">
<link rel="icon" href="/devdocs/favicon.ico"></head>
<script>
const baseUrl = '/devdocs'
</script>
<body data-code-theme="light">
<div id="app"><!--[--><div tags="dev-release" class="w-100 p-1 bg-info text-center d-print-none"><span><strong>This site documents developmental features of CustardUI (head of develop branch) and possible breaking changes.
For the latest stable release, visit <a href="https://custardui.github.io">here</a>.</strong></span></div> <header sticky><div data-v-26aac3dc><nav class="navbar navbar-expand-md d-print-none navbar-dark bg-dark" data-v-26aac3dc><div class="container-fluid" data-v-26aac3dc><div class="navbar-left" data-v-26aac3dc><!--[--><a href="/devdocs/index.html" title="Home" class="navbar-brand"><img src="/devdocs/images/custardUI-words.png" height="40"></a><!--]--></div><div class="navbar-default" data-v-26aac3dc><ul class="navbar-nav me-auto mt-2 mt-lg-0" data-v-26aac3dc><!--[--> <li><a highlight-on="exact" href="/devdocs/index.html" class="nav-link">HOME</a></li> <li><a highlight-on="sibling-or-child" href="/devdocs/authorGuide/index.html" class="nav-link">AUTHOR GUIDE</a></li> <li><a highlight-on="sibling-or-child" href="/devdocs/devGuide/index.html" class="nav-link">DEVELOPER GUIDE</a></li> <li><a highlight-on="exact" href="/devdocs/about.html" class="nav-link">ABOUT</a></li> <li><a highlight-on="none" href="#cv-open" class="nav-link"><div><div><svg fill="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg" width="1.2em" height="1.2em" style="vertical-align:middle;"><path fill-rule="evenodd" clip-rule="evenodd" d="M12 8.00002C9.79085 8.00002 7.99999 9.79088 7.99999 12C7.99999 14.2092 9.79085 16 12 16C14.2091 16 16 14.2092 16 12C16 9.79088 14.2091 8.00002 12 8.00002ZM9.99999 12C9.99999 10.8955 10.8954 10 12 10C13.1046 10 14 10.8955 14 12C14 13.1046 13.1046 14 12 14C10.8954 14 9.99999 13.1046 9.99999 12Z" fill="currentColor"></path> <path fill-rule="evenodd" clip-rule="evenodd" d="M10.7673 1.01709C10.9925 0.999829 11.2454 0.99993 11.4516 1.00001L12.5484 1.00001C12.7546 0.99993 13.0075 0.999829 13.2327 1.01709C13.4989 1.03749 13.8678 1.08936 14.2634 1.26937C14.7635 1.49689 15.1915 1.85736 15.5007 2.31147C15.7454 2.67075 15.8592 3.0255 15.9246 3.2843C15.9799 3.50334 16.0228 3.75249 16.0577 3.9557L16.1993 4.77635L16.2021 4.77788C16.2369 4.79712 16.2715 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fill="currentColor"></path></svg></div></div></a></li> <li><a highlight-on="none" href="#cv-share" class="nav-link"><div><div><svg xmlns="http://www.w3.org/2000/svg" width="1.2em" height="1.2em" viewBox="0 0 24 24" fill="currentColor" style="vertical-align:middle;"><path d="M18 8h-2a1 1 0 0 0 0 2h2v8H6v-8h2a1 1 0 0 0 0-2H6a2 2 0 0 0-2 2v8a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2v-8a2 2 0 0 0-2-2z"></path> <path d="M11 6.41V12a1 1 0 0 0 2 0V6.41l1.29 1.3a1 1 0 0 0 1.42 0a1 1 0 0 0 0-1.42l-3-3a1 1 0 0 0-1.42 0l-3 3a1 1 0 1 0 1.42 1.42L11 6.41z"></path></svg></div></div></a></li> <li><a href="https://github.com/custardui/custardui" target="_blank" class="nav-link"><span><span aria-hidden="true" class="fab fa-github"></span></span></a></li> <!--]--></ul></div><ul class="navbar-nav navbar-right" data-v-26aac3dc><!--[--><li><form class="navbar-form"><div style="position:relative;" class="dropdown" data-v-00e26d0a><!--[--><input value="" data-bs-toggle="dropdown" type="text" class="form-control" placeholder="Search" autocomplete="off" data-v-00e26d0a><div class="form-control placeholder-div-hidden" data-v-00e26d0a>Search</div><!--]--><ul class="dropdown-menu search-dropdown-menu dropdown-menu-hidden dropdown-menu-end" data-v-00e26d0a><!--[--><!--]--></ul></div></form></li><!--]--></ul></div></nav><div style="display:none;" class="lower-navbar-container" data-v-26aac3dc><!--[--><!----><!----><!--]--></div></div></header> <div id="flex-body"><div id="content-wrapper"><div class="cv-hero-title"><span class="cv-custard">Custard</span><span class="cv-ui">U<span style="font-family:Georgia, serif;">I</span></span></div> <div class="cv-hero-tagline">Let readers <span class="hero-text-highlight">customise</span> your static web pages!</div> <div class="cv-hero-accent"></div> <p>Add CustardUI to any static site and let readers personalise their experience. Hide sections, set preferences and share exactly the right content with others. No backend required.</p> <p><a href="/devdocs/authorGuide"><span aria-hidden="true" class="fa-solid fa-book"></span> Read the docs</a> • <a href="https://github.com/custardui/custardui"><span aria-hidden="true" class="fa-brands fa-github"></span> View on GitHub</a> • <a href="https://www.npmjs.com/package/@custardui/custardui"><span aria-hidden="true" class="fa-solid fa-cube"></span> npm package</a></p> <br> <h2 class="cv-section-title" id="what-it-can-do">What it can do<a class="fa fa-anchor" href="#what-it-can-do" onclick="event.stopPropagation()"></a></h2> <p class="cv-section-header" style="margin-top:0rem;">Hide irrelevant sections; Collapse less relevant sections.</p> <p>Let readers collapse what they don't need. Their choice sticks across pages and sessions.</p> <div><div class="cv-browser-triple"><div class="cv-browser-triple-bar"><div class="cv-browser-triple-dots"><div class="cv-browser-triple-dot"></div> <div class="cv-browser-triple-dot"></div> <div class="cv-browser-triple-dot"></div></div> <div class="cv-browser-triple-url">https://project-documentation.org/best-practices</div> <div class="cv-browser-triple-menu"><div class="cv-browser-triple-menu-dot"></div> <div class="cv-browser-triple-menu-dot"></div> <div class="cv-browser-triple-menu-dot"></div></div></div> <div class="cv-browser-triple-panes"><div class="cv-browser-triple-col"><div class="cv-browser-triple-pane"><h4 id="dependency-injection">Dependency Injection<a class="fa fa-anchor" href="#dependency-injection" onclick="event.stopPropagation()"></a></h4> <p><strong>Toggle:</strong> <cv-toggle-control toggle-id="code-example-hide" inline></cv-toggle-control></p> <p>Dependency Injection (DI) is a technique where an object's dependencies are provided externally rather than created by the object itself. This reduces coupling and makes code easier to test.</p> <cv-toggle toggle-id="code-example-hide" show-label show-peek-border><pre><code class="hljs java"><span><span class="hljs-comment">// Without DI — tightly coupled</span>
</span><span><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">UserService</span> </span>{
</span><span> <span class="hljs-keyword">private</span> Database db = <span class="hljs-keyword">new</span> Database();
</span><span>}
</span><span>
</span><span><span class="hljs-comment">// With DI — dependency is injected</span>
</span><span><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">UserService</span> </span>{
</span><span> <span class="hljs-keyword">private</span> Database db;
</span><span>
</span><span> <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">UserService</span><span class="hljs-params">(Database db)</span> </span>{
</span><span> <span class="hljs-keyword">this</span>.db = db;
</span><span> }
</span><span>}
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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</button></div></pre></cv-toggle> <p><span class="dimmed">Prefer constructor injection over field injection — it makes dependencies explicit and the class easier to test.</span></p></div></div> <div class="cv-browser-triple-col"><div class="cv-browser-triple-pane"><h4 id="dependency-injection-2">Dependency Injection<a class="fa fa-anchor" href="#dependency-injection-2" onclick="event.stopPropagation()"></a></h4> <p><strong>Toggle:</strong> <cv-toggle-control toggle-id="code-example-peek" inline></cv-toggle-control></p> <p>Dependency Injection (DI) is a technique where an object's dependencies are provided externally rather than created by the object itself. This reduces coupling and makes code easier to test.</p> <cv-toggle toggle-id="code-example-peek" show-label show-peek-border><pre><code class="hljs java"><span><span class="hljs-comment">// Without DI — tightly coupled</span>
</span><span><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">UserService</span> </span>{
</span><span> <span class="hljs-keyword">private</span> Database db = <span class="hljs-keyword">new</span> Database();
</span><span>}
</span><span>
</span><span><span class="hljs-comment">// With DI — dependency is injected</span>
</span><span><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">UserService</span> </span>{
</span><span> <span class="hljs-keyword">private</span> Database db;
</span><span>
</span><span> <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">UserService</span><span class="hljs-params">(Database db)</span> </span>{
</span><span> <span class="hljs-keyword">this</span>.db = db;
</span><span> }
</span><span>}
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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5.1054688 z "></path>
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</button></div></pre></cv-toggle> <p><span class="dimmed">Prefer constructor injection over field injection — it makes dependencies explicit and the class easier to test.</span></p></div></div> <div class="cv-browser-triple-col"><div class="cv-browser-triple-pane"><h4 id="dependency-injection-3">Dependency Injection<a class="fa fa-anchor" href="#dependency-injection-3" onclick="event.stopPropagation()"></a></h4> <p><strong>Toggle:</strong> <cv-toggle-control toggle-id="code-example-show" inline></cv-toggle-control></p> <p>Dependency Injection (DI) is a technique where an object's dependencies are provided externally rather than created by the object itself. This reduces coupling and makes code easier to test.</p> <cv-toggle toggle-id="code-example-show" show-label show-peek-border><pre><code class="hljs java"><span><span class="hljs-comment">// Without DI — tightly coupled</span>
</span><span><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">UserService</span> </span>{
</span><span> <span class="hljs-keyword">private</span> Database db = <span class="hljs-keyword">new</span> Database();
</span><span>}
</span><span>
</span><span><span class="hljs-comment">// With DI — dependency is injected</span>
</span><span><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">UserService</span> </span>{
</span><span> <span class="hljs-keyword">private</span> Database db;
</span><span>
</span><span> <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">UserService</span><span class="hljs-params">(Database db)</span> </span>{
</span><span> <span class="hljs-keyword">this</span>.db = db;
</span><span> }
</span><span>}
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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9.3222656 L 3.4746094 10.144531 L 8.8027344 10.144531 L 8.8027344 9.3222656 L
7.4492188 9.3222656 L 7.4492188 0.93164062 L 10.25 0.93164062 L 10.25 2.5351562 L
11.166016 2.5351562 L 11.166016 0 L 1.109375 0 z M 10.84375 5.1054688 L 10.84375
6.6074219 C 12.268027 6.6074219 13.40625 7.7456444 13.40625 9.1699219 C 13.40625
10.185673 12.827237 11.055036 11.978516 11.470703 L 11.978516 9.5175781 L 7.1386719
12.3125 L 11.978516 15.105469 L 11.978516 13.072266 C 13.66701 12.577757 14.910156
11.012746 14.910156 9.1699219 C 14.910156 6.9333638 13.080308 5.1054688 10.84375
5.1054688 z "></path>
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</button></div></pre></cv-toggle> <p><span class="dimmed">Prefer constructor injection over field injection — it makes dependencies explicit and the class easier to test.</span></p></div></div></div></div></div> <p><span class="dimmed">The same page, three toggle states, where each reader can set their own peferences and see only what they chose to.</span></p> <hr> <p class="cv-section-header">Set the default tab in tab groups.</p> <p>Let readers switch to their preferred view for tabgroups once, and this selection persists across your site.</p> <ul><li>Hover and click the <span aria-hidden="true" class="fa-solid fa-bookmark"></span> icon on any tab, or simply double-click it, to set it as your default across the site.</li> <li>Prefer a cleaner view? Hide the tab bar entirely in the settings modal through the <span aria-hidden="true" class="fa-solid fa-gear"></span> icon on the left. Click the option to <br> <em>"show only the selected tab"</em> to hide the navigation headers and show only your preferred content!</li></ul> <div><div class="cv-browser-split"><div class="cv-browser-split-bar"><div class="cv-browser-split-dots"><div class="cv-browser-split-dot"></div> <div class="cv-browser-split-dot"></div> <div class="cv-browser-split-dot"></div></div> <div class="cv-browser-split-urls"><div class="cv-browser-split-url">https://course-website.org/textbook/sorting</div> <div class="cv-browser-split-url-divider"></div> <div class="cv-browser-split-url">https://course-website.org/textbook/searching</div></div> <div class="cv-browser-split-menu"><div class="cv-browser-split-menu-dot"></div> <div class="cv-browser-split-menu-dot"></div> <div class="cv-browser-split-menu-dot"></div></div></div> <div class="cv-browser-split-panes"><div class="cv-browser-split-pane"><h4 id="insertion-sort">Insertion Sort<a class="fa fa-anchor" href="#insertion-sort" onclick="event.stopPropagation()"></a></h4> <p><span class="dimmed">Insertion Sort builds a sorted array one element at a time by picking each element and placing it in its correct position. Simple and efficient for small or nearly sorted arrays.</span></p> <cv-tabgroup group-id="tab-group-example" nav="auto"><cv-tab tab-id="javascript" header="JavaScript"><pre><code class="hljs javascript"><span><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">insertionSort</span>(<span class="hljs-params">arr</span>) </span>{
</span><span> <span class="hljs-keyword">for</span> (<span class="hljs-keyword">let</span> i = <span class="hljs-number">1</span>; i < arr.length; i++) {
</span><span> <span class="hljs-keyword">let</span> key = arr[i];
</span><span> <span class="hljs-keyword">let</span> j = i - <span class="hljs-number">1</span>;
</span><span> <span class="hljs-keyword">while</span> (j >= <span class="hljs-number">0</span> && arr[j] > key) {
</span><span> arr[j + <span class="hljs-number">1</span>] = arr[j];
</span><span> j--;
</span><span> }
</span><span> arr[j + <span class="hljs-number">1</span>] = key;
</span><span> }
</span><span>}
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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</span><span> <span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i = <span class="hljs-number">1</span>; i < arr.length; i++) {
</span><span> <span class="hljs-keyword">int</span> key = arr[i];
</span><span> <span class="hljs-keyword">int</span> j = i - <span class="hljs-number">1</span>;
</span><span> <span class="hljs-keyword">while</span> (j >= <span class="hljs-number">0</span> && arr[j] > key) {
</span><span> arr[j + <span class="hljs-number">1</span>] = arr[j];
</span><span> j--;
</span><span> }
</span><span> arr[j + <span class="hljs-number">1</span>] = key;
</span><span> }
</span><span>}
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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11.012746 14.910156 9.1699219 C 14.910156 6.9333638 13.080308 5.1054688 10.84375
5.1054688 z "></path>
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</span><span> <span class="hljs-keyword">for</span> i <span class="hljs-keyword">in</span> <span class="hljs-built_in">range</span>(<span class="hljs-number">1</span>, <span class="hljs-built_in">len</span>(arr)):
</span><span> key = arr[i]
</span><span> j = i - <span class="hljs-number">1</span>
</span><span> <span class="hljs-keyword">while</span> j >= <span class="hljs-number">0</span> <span class="hljs-keyword">and</span> arr[j] > key:
</span><span> arr[j + <span class="hljs-number">1</span>] = arr[j]
</span><span> j -= <span class="hljs-number">1</span>
</span><span> arr[j + <span class="hljs-number">1</span>] = key
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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5.1054688 z "></path>
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</button></div></pre></cv-tab></cv-tabgroup> <p><span class="dimmed">Time complexity: O(n²) worst case, O(n) best case on nearly sorted arrays.</span></p></div> <div class="cv-browser-split-pane"><h4 id="binary-search">Binary Search<a class="fa fa-anchor" href="#binary-search" onclick="event.stopPropagation()"></a></h4> <p><span class="dimmed">Binary Search finds a target value in a sorted array by repeatedly halving the search space. Far more efficient than linear search for large datasets.</span></p> <cv-tabgroup group-id="tab-group-example" nav="auto"><cv-tab tab-id="javascript" header="JavaScript"><pre><code class="hljs javascript"><span><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">binarySearch</span>(<span class="hljs-params">arr, target</span>) </span>{
</span><span> <span class="hljs-keyword">let</span> left = <span class="hljs-number">0</span>, right = arr.length - <span class="hljs-number">1</span>;
</span><span> <span class="hljs-keyword">while</span> (left <= right) {
</span><span> <span class="hljs-keyword">const</span> mid = <span class="hljs-built_in">Math</span>.floor((left + right) / <span class="hljs-number">2</span>);
</span><span> <span class="hljs-keyword">if</span> (arr[mid] === target) <span class="hljs-keyword">return</span> mid;
</span><span> <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (arr[mid] < target) left = mid + <span class="hljs-number">1</span>;
</span><span> <span class="hljs-keyword">else</span> right = mid - <span class="hljs-number">1</span>;
</span><span> }
</span><span> <span class="hljs-keyword">return</span> -<span class="hljs-number">1</span>;
</span><span>}
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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9.3222656 L 3.4746094 10.144531 L 8.8027344 10.144531 L 8.8027344 9.3222656 L
7.4492188 9.3222656 L 7.4492188 0.93164062 L 10.25 0.93164062 L 10.25 2.5351562 L
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6.6074219 C 12.268027 6.6074219 13.40625 7.7456444 13.40625 9.1699219 C 13.40625
10.185673 12.827237 11.055036 11.978516 11.470703 L 11.978516 9.5175781 L 7.1386719
12.3125 L 11.978516 15.105469 L 11.978516 13.072266 C 13.66701 12.577757 14.910156
11.012746 14.910156 9.1699219 C 14.910156 6.9333638 13.080308 5.1054688 10.84375
5.1054688 z "></path>
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</button></div></pre></cv-tab> <cv-tab tab-id="java" header="Java"><pre><code class="hljs java"><span><span class="hljs-function"><span class="hljs-keyword">int</span> <span class="hljs-title">binarySearch</span><span class="hljs-params">(<span class="hljs-keyword">int</span>[] arr, <span class="hljs-keyword">int</span> target)</span> </span>{
</span><span> <span class="hljs-keyword">int</span> left = <span class="hljs-number">0</span>, right = arr.length - <span class="hljs-number">1</span>;
</span><span> <span class="hljs-keyword">while</span> (left <= right) {
</span><span> <span class="hljs-keyword">int</span> mid = (left + right) / <span class="hljs-number">2</span>;
</span><span> <span class="hljs-keyword">if</span> (arr[mid] == target) <span class="hljs-keyword">return</span> mid;
</span><span> <span class="hljs-keyword">else</span> <span class="hljs-keyword">if</span> (arr[mid] < target) left = mid + <span class="hljs-number">1</span>;
</span><span> <span class="hljs-keyword">else</span> right = mid - <span class="hljs-number">1</span>;
</span><span> }
</span><span> <span class="hljs-keyword">return</span> -<span class="hljs-number">1</span>;
</span><span>}
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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1.363281 Z M 13.453125 2.726562 L 5.453125 2.726562 C 4.65625 2.726562 4 3.339844 4
4.089844 L 4 13.636719 C 4 14.386719 4.65625 15 5.453125 15 L 13.453125 15 C 14.253906
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6.6074219 C 12.268027 6.6074219 13.40625 7.7456444 13.40625 9.1699219 C 13.40625
10.185673 12.827237 11.055036 11.978516 11.470703 L 11.978516 9.5175781 L 7.1386719
12.3125 L 11.978516 15.105469 L 11.978516 13.072266 C 13.66701 12.577757 14.910156
11.012746 14.910156 9.1699219 C 14.910156 6.9333638 13.080308 5.1054688 10.84375
5.1054688 z "></path>
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</button></div></pre></cv-tab> <cv-tab tab-id="python" header="Python"><pre><code class="hljs python"><span><span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">binary_search</span>(<span class="hljs-params">arr, target</span>):</span>
</span><span> left, right = <span class="hljs-number">0</span>, <span class="hljs-built_in">len</span>(arr) - <span class="hljs-number">1</span>
</span><span> <span class="hljs-keyword">while</span> left <= right:
</span><span> mid = (left + right) // <span class="hljs-number">2</span>
</span><span> <span class="hljs-keyword">if</span> arr[mid] == target:
</span><span> <span class="hljs-keyword">return</span> mid
</span><span> <span class="hljs-keyword">elif</span> arr[mid] < target:
</span><span> left = mid + <span class="hljs-number">1</span>
</span><span> <span class="hljs-keyword">else</span>:
</span><span> right = mid - <span class="hljs-number">1</span>
</span><span> <span class="hljs-keyword">return</span> -<span class="hljs-number">1</span>
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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</button></div></pre></cv-tab></cv-tabgroup> <p><span class="dimmed">Time complexity: O(log n). Requires the array to be sorted before searching.</span></p></div></div></div></div> <p><span class="dimmed">Switch to Python on either page, and every code example across the site follows.</span></p> <hr> <p class="cv-section-header">Tweak placeholder text to match the reader's profile.</p> <p>Let readers personalise your page to their needs.</p> <ul><li>Define a placeholder once, readers fill it in, and every instance across the site updates instantly. No backend required.</li></ul> <div><div class="cv-browser-single"><div class="cv-browser-single-bar"><div class="cv-browser-single-dots"><div class="cv-browser-single-dot"></div> <div class="cv-browser-single-dot"></div> <div class="cv-browser-single-dot"></div></div> <div class="cv-browser-single-url">https://course-website.org/admin/setup</div> <div class="cv-browser-triple-menu"><div class="cv-browser-triple-menu-dot"></div> <div class="cv-browser-triple-menu-dot"></div> <div class="cv-browser-triple-menu-dot"></div></div></div> <div class="cv-browser-single-body"><h4 id="course-instructions-and-guide"><span aria-hidden="true" class="fa-solid fa-graduation-cap"></span> Course Instructions and Guide<a class="fa fa-anchor" href="#course-instructions-and-guide" onclick="event.stopPropagation()"></a></h4> <p>Follow the steps below to set up your individual project repository. Enter your GitHub username once — all links and commands on this page will update to match.</p> <p>Enter your GitHub username here: <cv-placeholder-input name="username" hint="e.g. johndoe" layout="inline" appearance="underline"></cv-placeholder-input>
<img src="https://github.com/[[username : github ]].png" style="height:1.8rem;vertical-align:middle;border-radius:50%;margin-left:0.5rem;" class="cv-bind" alt="GitHub Avatar"></p> <p><strong>Step 1 — Fork and accept the invitation</strong></p> <p>Accept the GitHub Classroom invitation using your account at <span aria-hidden="true" class="fa-brands fa-github"></span> <a href="https://github.com[[username ? /$ : ]]" class="cv-bind" target="_blank">github.com[[username ? /$ : ]]</a>. This will create a pre-configured fork of the exercise repository under your account.</p> <p><strong>Step 2 — Clone and get started</strong></p> <p>Run the command below to clone your repository to your local machine, then make your first commit to confirm everything is working.</p> <pre><code class="hljs"><span>git clone https://[[ username ? github.com/cs2103t/$-ip.git : your-repo-link ]]
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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No more "scroll down and look for it."</p> <div><div class="cv-browser-split"><div class="cv-browser-split-bar"><div class="cv-browser-split-dots"><div class="cv-browser-split-dot"></div> <div class="cv-browser-split-dot"></div> <div class="cv-browser-split-dot"></div></div> <div class="cv-browser-split-urls"><div class="cv-browser-split-url">https://course-website.org/textbook/week9</div> <div class="cv-browser-split-url-divider"></div> <div class="cv-browser-split-url">https://course-website.org/admin/faq</div></div> <div class="cv-browser-split-menu"><div class="cv-browser-split-menu-dot"></div> <div class="cv-browser-split-menu-dot"></div> <div class="cv-browser-split-menu-dot"></div></div></div> <div class="cv-browser-split-panes"><div class="cv-browser-split-pane"><h4 id="liskov-substitution-principle">Liskov Substitution Principle<a class="fa fa-anchor" href="#liskov-substitution-principle" onclick="event.stopPropagation()"></a></h4> <p>The Liskov Substitution Principle (LSP) states that objects of a subclass should be substitutable for objects of the superclass without altering the correctness of the program.</p> <div id="lsp-violation-example"><p><strong>Common violation:</strong> Overriding a method in a subclass to throw an exception or do nothing breaks substitutability — callers written against the superclass will break unexpectedly.</p> <p><a href="/devdocs/?cv-highlight=lsp-violation-example"><span aria-hidden="true" class="fa-solid fa-link"></span> Share</a> · <a href="/devdocs/?cv-highlight=lsp-violation-example%3Ared%3Abr%3AWatch%2520out%2520for%2520this%2521"><span aria-hidden="true" class="fa-solid fa-link"></span> Share with note</a></p></div> <p>The principle encourages designing inheritance hierarchies where subclasses genuinely extend, rather than contradict, the behaviour of their parent.</p></div> <div class="cv-browser-split-pane"><h4 id="frequently-asked-questions">Frequently Asked Questions<a class="fa fa-anchor" href="#frequently-asked-questions" onclick="event.stopPropagation()"></a></h4> <p><strong>When is the submission deadline?</strong></p> <p>All submissions are due Friday 11:59 PM. Push to your <code class="hljs inline no-lang">main</code> branch on GitHub.</p> <div id="faq-team-repo"><p><strong>Where do I find my team repo?</strong></p> <p>Your team repo is at <code class="hljs inline no-lang">github.com/course-[team-id]/project</code>. If you cannot access it, check that you have accepted the GitHub Classroom invitation.</p> <p><a href="/devdocs/?cv-highlight=faq-team-repo"><span aria-hidden="true" class="fa-solid fa-link"></span> Share</a> · <a href="/devdocs/?cv-highlight=faq-team-repo%3A%3Atl%3ARefer%2520to%2520this%2521"><span aria-hidden="true" class="fa-solid fa-link"></span> Share with note</a></p></div> <p><strong>How do I add my tutor as a collaborator?</strong></p> <p>Go to your repo → Settings → Collaborators → Add your tutor's GitHub username.</p></div></div></div></div> <p><span class="dimmed">Click "Share" for a plain highlight, or "Share with note" to include a message and color. The URL encodes the element, color, position, and note — the recipient lands directly on that section.</span></p> <p><strong>Generating share links is built in.</strong> Add <code class="hljs inline no-lang">#cv-share</code> to any page URL to enter share mode. Hover over any element on the page, add a note, and CustardUI generates the shareable URL for you. Links use content fingerprinting to stay robust even if the page text changes slightly.</p> <hr> <p class="cv-section-header">Share your customisations with others.</p> <p>Send a custom link that opens the page exactly as you intend, with placeholders pre-filled, sections pre-set. The recipient sees a personalised view instantly, no configuration needed.</p> <div><div class="cv-browser-single"><div class="cv-browser-single-bar"><div class="cv-browser-single-dots"><div class="cv-browser-single-dot"></div> <div class="cv-browser-single-dot"></div> <div class="cv-browser-single-dot"></div></div> <div class="cv-browser-single-url">https://course.org/setup?ph=username:johndoe,name:John%20Doe&t-hide=optional-steps</div> <div class="cv-browser-triple-menu"><div class="cv-browser-triple-menu-dot"></div> <div class="cv-browser-triple-menu-dot"></div> <div class="cv-browser-triple-menu-dot"></div></div></div> <div class="cv-browser-single-body"><h4 id="course-setup-guide">Course Setup Guide<a class="fa fa-anchor" href="#course-setup-guide" onclick="event.stopPropagation()"></a></h4> <p><span class="dimmed">This page was shared with your details pre-filled.</span></p> <p>Welcome, <strong>John Doe</strong>! Here are your setup instructions.</p> <hr> <p><strong>Step 1 — Accept the classroom invitation</strong></p> <p>Accept the invitation at <a href="https://github.com/johndoe" target="_blank">github.com/johndoe</a>. This will create your personal fork of the exercise repository.</p> <p><strong>Step 2 — Clone your repository</strong></p> <pre><code class="hljs bash"><span>git <span class="hljs-built_in">clone</span> https://github.com/cs2103t/johndoe-ip.git
</span><span><span class="hljs-built_in">cd</span> johndoe-ip
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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</span><span>git commit -m <span class="hljs-string">"Initial commit"</span>
</span><span>git push origin main
</span></code><div class="function-btn-container"><button onclick="copyCodeBlock(this)" class="function-btn d-print-none">
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</button></div></pre><p><span class="dimmed"><code class="hljs inline no-lang">ph=</code> pre-fills placeholders. <code class="hljs inline no-lang">t-hide=</code> hides toggle sections. A teacher can generate this link in seconds and send it directly to a student.</span></p> <hr> <p class="cv-section-header">Advanced: let adopters create adaptations of your site.</p> <p>Authors can expose selected content, such as logos, images, labels, and branding text, as adaptation points. Each organisation that adopts the site supplies a config preset overriding those values. The result is a single deployment that feels native to every audience it serves.</p> <div><div class="cv-browser-split"><div class="cv-browser-split-bar"><div class="cv-browser-split-dots"><div class="cv-browser-split-dot"></div> <div class="cv-browser-split-dot"></div> <div class="cv-browser-split-dot"></div></div> <div class="cv-browser-split-urls"><div class="cv-browser-split-url">onboarding.example.com#/alpha-corp</div> <div class="cv-browser-split-url-divider"></div> <div class="cv-browser-split-url">onboarding.example.com#/beta-labs</div></div> <div class="cv-browser-split-menu"><div class="cv-browser-split-menu-dot"></div> <div class="cv-browser-split-menu-dot"></div> <div class="cv-browser-split-menu-dot"></div></div></div> <div class="cv-browser-split-panes"><div class="cv-browser-split-pane"><h5 id="alpha-corp-onboarding-guide"><span aria-hidden="true" class="fa-solid fa-building"></span> <strong>Alpha Corp — Onboarding Guide</strong><a class="fa fa-anchor" href="#alpha-corp-onboarding-guide" onclick="event.stopPropagation()"></a></h5> <p>Welcome to <strong>Alpha Corp</strong>! Follow the steps below to get set up.</p> <p><strong>Exercise 1</strong> <cv-label color="#3b82f6">OPTIONAL</cv-label></p> <p>Complete the introductory module at your own pace.</p> <p><strong>Exercise 2</strong> <cv-label color="#3b82f6">OPTIONAL</cv-label></p> <p>Read through the team handbook before your first standup.</p> <p><span class="dimmed">Powered by the <code class="hljs inline no-lang">alpha-corp</code> adaptation preset.</span></p></div> <div class="cv-browser-split-pane"><h5 id="beta-labs-onboarding-guide"><span aria-hidden="true" class="fa-solid fa-flask"></span> <strong>Beta Labs — Onboarding Guide</strong><a class="fa fa-anchor" href="#beta-labs-onboarding-guide" onclick="event.stopPropagation()"></a></h5> <p>Welcome to <strong>Beta Labs</strong>! Follow the steps below to get set up.</p> <p><strong>Exercise 1</strong> <cv-label color="#ef4444">COMPULSORY</cv-label></p> <p>Complete the introductory module before your first day.</p> <p><strong>Exercise 2</strong> <cv-label color="#ef4444">COMPULSORY</cv-label></p> <p>Read through the team handbook before your first standup.</p> <p><span class="dimmed">Powered by the <code class="hljs inline no-lang">beta-labs</code> adaptation preset.</span></p></div></div></div></div> <p><span class="dimmed">Same page, same deployment — different logo, different branding, different labels. Each organisation supplies a config preset; the site adapts automatically.</span></p> <hr> <br> <h2 class="cv-section-title" id="how-it-works">How it works<a class="fa fa-anchor" href="#how-it-works" onclick="event.stopPropagation()"></a></h2> <p>All reader preferences, tab selections, toggle states, and placeholder values are saved in the browser's localStorage. Nothing is sent to a server, nothing leaves the device. You define exactly what can be customised; readers adjust within those boundaries.</p> <p>CustardUI works across all modern browsers with no configuration needed on the reader's end.</p> <hr> <br> <h2 class="cv-section-title" id="works-with-any-static-site">Works with any static site<a class="fa fa-anchor" href="#works-with-any-static-site" onclick="event.stopPropagation()"></a></h2> <p>CustardUI is open source under the MIT licence. Add it to any static site with a single script tag without needing any build step, npm install, or backend.</p> <p>Built and tested with <a href="https://markbind.org/">MarkBind</a>. Also works with Jekyll, Docusaurus, React static sites, and any site that serves plain HTML.</p> <p><a href="https://github.com/custardui/custardui"><span aria-hidden="true" class="fa-brands fa-github"></span> View on GitHub</a> • <a href="https://www.npmjs.com/package/@custardui/custardui"><span aria-hidden="true" class="fa-solid fa-cube"></span> npm package</a></p> <hr> <br> <h2 class="cv-section-title" id="how-to-get-started">How to Get Started<a class="fa fa-anchor" href="#how-to-get-started" onclick="event.stopPropagation()"></a></h2> <p>Up and running in minutes. Add one script tag. Write one config file.</p> <div class="cv-setup-steps"><div class="cv-setup-step"><div class="cv-step-num">1</div> <div><h4 id="add-the-script-tag">Add the script tag<a class="fa fa-anchor" href="#add-the-script-tag" onclick="event.stopPropagation()"></a></h4> <p>Drop one line of the CustardUI CDN script into your base layout or <code class="hljs inline no-lang"><head></code> template.
</p></div><p></p></div> <div class="cv-setup-step"><div class="cv-step-num">2</div> <div><h4 id="create-your-config">Create your config<a class="fa fa-anchor" href="#create-your-config" onclick="event.stopPropagation()"></a></h4> <p>Add a <code class="hljs inline no-lang">custardui.config.json</code> to your site root. Define what readers can customise.
</p></div><p></p></div></div> <p>Done. Check the author guide for components and examples.</p> <br> <br> <div class="cv-cta-actions"><a href="/devdocs/authorGuide/gettingStarted.html" class="cv-btn-secondary"><span><span aria-hidden="true" class="fa-solid fa-book"></span></span> Read the Author Guide</a></div> <div class="cv-logo-row"><div class="cv-logo-item"><img src="/devdocs/images/logo-art/custard-click.png" alt="Custard Click"></div> <div class="cv-logo-item"><img src="/devdocs/images/logo-art/custard-half.png" alt="Custard Half"></div> <div class="cv-logo-item"><img src="/devdocs/images/logo-art/custard-inspect.png" alt="Custard Inspect"></div> <div class="cv-logo-item cv-logo-placeholder"><img src="/devdocs/images/logo-art/custard-placeholder.png" alt="Custard Placeholder"></div> <div class="cv-logo-item"><img src="/devdocs/images/logo-art/custard-share.png" alt="Custard Share"></div></div> <br></div> <div class="scroll-top-button fa-lg d-print-none" style="display:none;bottom:2%;right:2%;position:fixed;" aria-hidden="true"><!--[--><i class="fas fa-arrow-circle-up"></i><!--]--></div></div> <div><footer><div class="text-center"><small>[Generated by <a href="https://markbind.org/">MarkBind 6.3.1</a> on Sat, 4 Apr 2026, 17:46:09 GMT+8]</small><br></div></footer></div><!--]--></div>
</body><style>
.cv-browser-triple {
border: 1px solid rgba(196,133,58,0.4);
border-radius: 10px;
overflow: hidden;
margin: 1rem 0;
font-size: 0.9rem;
}
.cv-browser-triple-bar {
background: rgba(129,76,32,0.2);
border-bottom: 1px solid rgba(196,133,58,0.35);
padding: 0.5rem 0.75rem;
display: flex;
align-items: center;
gap: 0.6rem;
}
.cv-browser-triple-dots {
display: flex;
gap: 5px;
flex-shrink: 0;
}
.cv-browser-triple-dot {
width: 10px;
height: 10px;
border-radius: 50%;
background: rgba(196,133,58,0.3);
}
.cv-browser-triple-url {
background: var(--bs-body-bg, #ffffff);
border: 1px solid rgba(196,133,58,0.2);
border-radius: 4px;
padding: 2px 10px;
font-size: 0.72rem;
color: var(--bs-body-color);
opacity: 0.8;
flex: 1;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.cv-browser-triple-panes {
display: flex;
background: rgba(129,76,32,0.1);
gap: 6px;
padding: 6px;
align-items: stretch;
}
.cv-browser-triple-col {
flex: 1;
min-width: 0;
display: flex;
flex-direction: column;
}
.cv-browser-triple-pane {
padding: 1rem 1.25rem;
font-size: 0.85rem;
background: var(--bs-body-bg, #ffffff);
border-radius: 6px;
border: 1px solid rgba(196,133,58,0.15);
flex: 1;
}
.cv-browser-triple-menu {
display: flex;
flex-direction: column;
gap: 3px;
flex-shrink: 0;
width: 40px;
align-items: flex-end;
justify-content: center;
opacity: 0.4;
padding-right: 4px;
}
.cv-browser-triple-menu-dot {
width: 3px;
height: 3px;
border-radius: 50%;
background: var(--custard-light-brown);
}
</style>
<style>
.cv-browser-split {
border: 1px solid rgba(196,133,58,0.4);
border-radius: 10px;
overflow: hidden;
margin: 1rem 0;
font-size: 0.9rem;
}
.cv-browser-split-bar {
background: rgba(129,76,32,0.2);
border-bottom: 1px solid rgba(129,76,32,0.35);
padding: 0.5rem 0.75rem;
display: flex;
align-items: center;
gap: 0.6rem;
}
.cv-browser-split-dots {
display: flex;
gap: 5px;
flex-shrink: 0;
}
.cv-browser-split-dot {
width: 10px;
height: 10px;
border-radius: 50%;
background: rgba(196,133,58,0.3);
}
.cv-browser-split-urls {
display: flex;
flex: 1;
align-items: center;
gap: 0.6rem;
}
.cv-browser-split-url-divider {
width: 1px;
height: 14px;
background: rgba(196,133,58,0.4);
flex-shrink: 0;
}
.cv-browser-split-url {
background: var(--bs-body-bg, #ffffff);
border: 1px solid rgba(129,76,32,0.2);
border-radius: 4px;
padding: 2px 10px;
font-size: 0.72rem;
color: var(--bs-body-color);
opacity: 0.8;
flex: 1;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.cv-browser-split-menu {
display: flex;
flex-direction: column;
gap: 3px;
flex-shrink: 0;
width: 40px;
align-items: flex-end;
justify-content: center;
opacity: 0.4;
padding-right: 4px;
}
.cv-browser-split-menu-dot {
width: 3px;
height: 3px;
border-radius: 50%;
background: var(--custard-light-brown);
}
.cv-browser-split-panes {
display: flex;
background: rgba(129,76,32,0.1);
gap: 6px;
padding: 6px;
}
.cv-browser-split-pane {
padding: 1.25rem 1.5rem;
font-size: 0.9rem;
background: var(--bs-body-bg, #ffffff);
flex: 1;
min-width: 0;
border-radius: 6px;
border: 1px solid rgba(129,76,32,0.2);
}
</style>
<style>
.cv-browser-single {
border: 1px solid rgba(196,133,58,0.4);
border-radius: 10px;
overflow: hidden;
margin: 1rem 0;
font-size: 0.9rem;
}
.cv-browser-single-bar {
background: rgba(129,76,32,0.2);
border-bottom: 1px solid rgba(196,133,58,0.35);
padding: 0.5rem 0.75rem;
display: flex;
align-items: center;
gap: 0.6rem;
}
.cv-browser-single-dots {
display: flex;
gap: 5px;
flex-shrink: 0;
}
.cv-browser-single-dot {
width: 10px;
height: 10px;
border-radius: 50%;
background: rgba(196,133,58,0.3);
}
.cv-browser-single-url {
background: var(--bs-body-bg, #ffffff);
border: 1px solid rgba(196,133,58,0.2);
border-radius: 4px;
padding: 2px 10px;
font-size: 0.72rem;
color: var(--bs-body-color);
opacity: 0.8;
flex: 1;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.cv-browser-single-body {
background: var(--bs-body-bg, #ffffff);
padding: 1.25rem 1.5rem;
}
.cv-browser-triple-menu {
display: flex;
flex-direction: column;
gap: 3px;
flex-shrink: 0;
width: 40px;
align-items: flex-end;
justify-content: center;
opacity: 0.4;
padding-right: 4px;
}
.cv-browser-triple-menu-dot {
width: 3px;
height: 3px;
border-radius: 50%;
background: var(--custard-light-brown);
}
</style>
<style>
.cv-browser-split {
border: 1px solid rgba(196,133,58,0.4);
border-radius: 10px;
overflow: hidden;
margin: 1rem 0;
font-size: 0.9rem;
}
.cv-browser-split-bar {
background: rgba(129,76,32,0.2);
border-bottom: 1px solid rgba(129,76,32,0.35);
padding: 0.5rem 0.75rem;
display: flex;
align-items: center;
gap: 0.6rem;
}
.cv-browser-split-dots {
display: flex;
gap: 5px;
flex-shrink: 0;
}
.cv-browser-split-dot {
width: 10px;
height: 10px;
border-radius: 50%;
background: rgba(196,133,58,0.3);
}
.cv-browser-split-urls {
display: flex;
flex: 1;
align-items: center;
gap: 0.6rem;
}
.cv-browser-split-url-divider {
width: 1px;
height: 14px;
background: rgba(196,133,58,0.4);
flex-shrink: 0;
}
.cv-browser-split-url {
background: var(--bs-body-bg, #ffffff);
border: 1px solid rgba(129,76,32,0.2);
border-radius: 4px;
padding: 2px 10px;
font-size: 0.72rem;
color: var(--bs-body-color);
opacity: 0.8;
flex: 1;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.cv-browser-split-menu {
display: flex;
flex-direction: column;
gap: 3px;
flex-shrink: 0;
width: 40px;
align-items: flex-end;
justify-content: center;
opacity: 0.4;
padding-right: 4px;
}
.cv-browser-split-menu-dot {
width: 3px;
height: 3px;
border-radius: 50%;
background: var(--custard-light-brown);
}
.cv-browser-split-panes {
display: flex;
background: rgba(129,76,32,0.1);
gap: 6px;
padding: 6px;
}
.cv-browser-split-pane {
padding: 1.25rem 1.5rem;