I Built the ULTIMATE Educational Website from Scratch — Day 3

Many people were asking me, how much time are going to spend on this. I was like may be 2 or 3 weeks. But, that question, led me to rethink how much time I'm spending on the website. I spent 8 hours on just the homepage. So, I've decided to quickly create content, and not focus on the minute details, which I did in the previous days. I've wasted a lot of your attention, now let's jump straight into the process.

Hour 19: Creating a Chemistry Content Page

I'll start by creating the periodicity-of-elements-qa.html file inside the Chemistry/3/ directory. This page will include questions and answers on the topic of the periodicity of elements.

    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Periodicity of Elements - Questions and Answers</title>
        <!-- styles and scripts -->


    <header>
        <nav>
            <div>



<p>As usual, I included a basic HTML boilerplate with links to necessary scripts and styles, along with navigation to main pages. I am using a container div, aside element with the id table-of-contents, which will be populated using javascript, and finally the main tag.</p>

<p>Next, I added the content, formatted with heading tags and some paragraph tags for the main body. For formulas and symbols I used the LaTeX syntax, LaTeX is used because it is the go-to standard:<br>
</p>

<pre class="brush:php;toolbar:false">            <h2>



</h2><p>This contains a lot of content, which is formatted using headings and sub-headings, some lists and tables. I also added an "About the Author" tag for authenticity.</p>

<p>I needed to style this page so that the text can be readable, and it doesn't look too bad. I will add an additional css file into this page, keeping style.css and style-main.css for common elements.</p>

<h2>
  
  
  Hour 20: Styling the content page and adding JS for dynamic Table of Contents
</h2>

<p>I created an style tag inside the head element, and added basic style to it:<br>
</p>

<pre class="brush:php;toolbar:false">     <style>
header {
    background: linear-gradient(135deg, #252525 0%, #303030 100%); /* Subtle gradient for depth */
    padding: 1.2rem 0; /* Slightly increased padding */
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2); /* More pronounced, darker shadow */
    position: sticky;
    top: 0;
    z-index: 1000; /* Increased z-index for better layering */
    transition: box-shadow 0.3s ease-in-out, transform 0.3s ease-in-out; /* Smooth transition for sticky effect */
    transform: translateY(0); /* Initial state for smooth sticky animation */
}

header.sticky-active {
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3); /* Different shadow when sticky */
    transform: translateY(-5px); /* Slight lift when sticky */
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 30px; /* Slightly increased side padding */
}

.logo {
    font-size: 2rem; /* Slightly larger logo */
    font-weight: 700; /* Bolder logo */
    color: #7db4ff; /* Updated logo color, slightly lighter */
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4); /* Subtle text shadow for depth */
    transition: transform 0.3s ease-in-out;
}

.logo:hover {
    transform: scale(1.05); /* Gentle scale on hover */
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: 30px; /* Use gap for spacing between list items */
}

nav ul li a {
    text-decoration: none;
    color: #f0f0f0; /* Slightly brighter text color */
    position: relative; /* For the underline effect */
    padding-bottom: 4px; /* Space for the underline */
    transition: color 0.3s ease-in-out, transform 0.3s ease-in-out;
    overflow: hidden; /* Clip the pseudo-element */
}

nav ul li a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: #7db4ff; /* Same as logo color for consistency */
    transform: scaleX(0); /* Initially hidden */
    transform-origin: bottom right;
    transition: transform 0.4s ease-out;
}

nav ul li a:hover {
    color: #90caf9; /* Lighter hover color */
    transform: translateY(-2px); /* Slight lift on hover */
}

nav ul li a:hover::before {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* Optional: Add an active state highlight */
nav ul li a.active {
    color: #90caf9;
    font-weight: 600;
}

nav ul li a.active::before {
    transform: scaleX(1);
}

/* Enhancements for Mobile (consider using JavaScript for more advanced mobile menus) */
@media (max-width: 1024px) {
    header {
        display: hidden;
    }
}
        :root {
    --primary-bg: #f9f9f9; /* Very light grey for a softer white */
    --secondary-bg: #ffffff; /* Pure white for content areas */
    --text-primary: #212121; /* Dark grey for primary text */
    --text-secondary: #757575; /* Medium grey for secondary text */
    --accent-color: #2962ff; /* A vibrant blue */
    --hover-color: #5393ff; /* Lighter blue for hover states */
    --border-color: #e0e0e0; /* Light grey for borders */
    --code-bg: #f0f0f0; /* Very light grey for code backgrounds */
    --code-text: #333333; /* Dark grey for code text */
    --toc-active: #2962ff;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
}

body {
    font-family: 'Roboto', sans-serif; /* A clean and modern sans-serif font */
    line-height: 1.6;
    margin: 0;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    padding-bottom: 40px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

/* Custom Scrollbar - Light theme version */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background-color: #bdbdbd;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: #9e9e9e;
}

.container {
    max-width: 1200px;
    margin: 50px auto;
    padding: 60px;
    background-color: var(--secondary-bg);
    box-shadow: var(--shadow-md);
    border-radius: 8px;
    display: grid;
    grid-template-columns: minmax(250px, 300px) 1fr;
    gap: 40px;
}

#table-of-contents {
    padding: 30px;
    background-color: var(--secondary-bg);
    border-radius: 6px;
    position: sticky;
    top: 30px;
    height: fit-content;
    border: 1px solid var(--border-color);
}

/* Custom Scrollbar for Table of Contents */
#table-of-contents::-webkit-scrollbar {
    width: 6px; /* Thinner scrollbar */
}

#table-of-contents::-webkit-scrollbar-track {
    background: #f1f1f1; /* Light background for the track */
    border-radius: 3px; /* Slightly rounded track */
}

#table-of-contents::-webkit-scrollbar-thumb {
    background-color: #bdbdbd; /* Medium grey for the thumb */
    border-radius: 3px; /* Slightly rounded thumb */
}

#table-of-contents::-webkit-scrollbar-thumb:hover {
    background-color: #9e9e9e; /* Darker grey on hover */
}

#table-of-contents > h2 {
    font-size: 1.5rem;
    margin-top: 0;
    margin-bottom: 15px;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    text-align: left;
}

#table-of-contents ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

#table-of-contents li {
    margin-bottom: 10px;
    padding-left: 0;
    border-left: 3px solid transparent;
    transition: border-left-color var(--transition-fast), color var(--transition-fast);
}

#table-of-contents li:hover,
#table-of-contents li.active {
    border-left-color: var(--toc-active);
}

#table-of-contents li.active > a {
    color: var(--toc-active);
    font-weight: 500;
}

#table-of-contents a {
    text-decoration: none;
    color: var(--text-secondary);
    display: block;
    padding: 6px 0;
    transition: color var(--transition-fast);
}

#table-of-contents a:hover {
    color: var(--hover-color);
}

#table-of-contents ul ul {
    margin-left: 15px;
    margin-top: 6px;
}

/* Main content styles - Focus on readability */
main {
    padding: 40px;
    border-radius: 6px;
    overflow: hidden;
    background-color: var(--secondary-bg);
    box-shadow: var(--shadow-sm);
}

main > *:not(:last-child) {
    margin-bottom: 2em;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

h1 {
    font-size: 2.5rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.4em;
    margin-bottom: 1em;
}

h2 {
    font-size: 24px;
    border-bottom: 1px solid var(--accent-color);
    padding-bottom: 0.3em;
    margin-bottom: 0.9em;
    color: var(--accent-color);
}

h3 {
    font-size: 1.6rem;
    margin-bottom: 0.7em;
}

h4 {
    font-size: 1.4rem;
    margin-bottom: 0.6em;
}

p {
    margin-bottom: 1.5em;
    color: var(--text-secondary);
    orphans: 3;
    widows: 3;
    word-break: break-word;
}

ul, ol {
    margin-left: 25px;
    margin-bottom: 1.7em;
}

li {
    margin-bottom: 0.7em;
    color: var(--text-secondary);
    line-height: 1.5;
    word-break: break-word;
}

strong {
    font-weight: 600;
    color: var(--text-primary);
}

em {
    font-style: italic;
    color: var(--accent-color);
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color var(--transition-fast);
    border-bottom: 1px solid transparent; /* Subtle underline on hover */
}

a:hover {
    color: var(--hover-color);
    border-bottom-color: var(--hover-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2em;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--secondary-bg);
}

th, td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    word-break: break-word;
}

th {
    background-color: #f5f5f5; /* Lighter header background */
    font-weight: 600;
    color: var(--text-primary);
}

tbody tr:nth-child(even) {
    background-color: #fafafa; /* Very light grey for even rows */
}

/* Code blocks - Light theme styling */
pre {
    background-color: var(--code-bg);
    color: var(--code-text);
    padding: 12px 18px;
    border-radius: 4px;
    overflow-x: auto;
    font-family: 'Menlo', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1.6em;
    white-space: pre-wrap;
    border: 1px solid var(--border-color);
}

code {
    font-family: 'Menlo', monospace;
    background-color: #e8e8e8; /* Even lighter background for inline code */
    color: var(--code-text);
    padding: 3px 6px;
    border-radius: 3px;
    word-break: break-word;
}

pre code {
    background-color: transparent;
    padding: 0;
}

/* Horizontal rules - Simpler style */
hr {
    border: none;
    height: 1px;
    background-color: var(--border-color);
    margin: 2em 0;
}

/* Blockquotes - Clean separation */
blockquote {
    border-left: 3px solid var(--accent-color);
    padding: 10px 15px;
    margin: 1.5em 0;
    font-style: italic;
    background-color: #f5f5f5;
    border-radius: 3px;
    color: var(--text-secondary);
}

blockquote p {
    margin-bottom: 0;
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    .container {
        max-width: 90%;
        padding: 50px;
        grid-template-columns: 1fr;
        gap: 30px;
    }

    #table-of-contents {
        position: static;
        margin-bottom: 30px;
    }

    #table-of-contents > h2 {
        text-align: center;
    }
}

@media (max-width: 768px) {
    main {
        padding: 30px;
    }

    h1 {
        font-size: 2.2rem;
    }

    h2 {
        font-size: 22px;
    }
    nav{
        display:none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 30px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 20px;
    }
}
    </style>

This is just basic styling, with some changes to the header, and the main content, to ensure, the elements are readable, not too distracting and is consistent across the website.
I've also added CSS for table, blockquotes, and code blocks to improve readability.

I also wanted to add a script to make the table of contents on the left interactive. So, I added this script to the bottom of the body tag:

<script>
        // script.js
document.addEventListener('DOMContentLoaded', () => {
    const mainContent = document.querySelector('main');
    const tableOfContents = document.getElementById('table-of-contents');

    if (!mainContent || !tableOfContents) {
        console.error('Main content or table of contents element not found.');
        return;
    }

    const headings = mainContent.querySelectorAll('h2, h3, h4');
    const tocList = document.createElement('ul');

    let currentList = tocList;
    const stack = [currentList];

    headings.forEach(heading => {
        const tagName = heading.tagName;
        const id = heading.id;
        const text = heading.textContent;

        if (id) {
            const listItem = document.createElement('li');
            const link = document.createElement('a');
            link.href = `#${id}`;
            link.textContent = text;
            listItem.appendChild(link);

            if (tagName === 'H2') {
                while (stack.length > 1) {
                    stack.pop();
                }
                currentList = stack[stack.length - 1];
                currentList.appendChild(listItem);
                stack.push(document.createElement('ul'));
                currentList = stack[stack.length - 1];
                listItem.appendChild(currentList);
            } else if (tagName === 'H3') {
                while (stack.length > 2) {
                    stack.pop();
                }
                currentList = stack[stack.length - 1];
                currentList.appendChild(listItem);
                stack.push(document.createElement('ul'));
                currentList = stack[stack.length - 1];
                listItem.appendChild(currentList);
            } else if (tagName === 'H4') {
                while (stack.length > 3) {
                    stack.pop();
                }
                currentList = stack[stack.length - 1];
                currentList.appendChild(listItem);
            }
        }
    });

    // Remove any empty ul elements that might have been created
    function removeEmptyLists(list) {
        Array.from(list.children).forEach(item => {
            if (item.tagName === 'UL' && item.children.length === 0) {
                item.remove();
            } else if (item.tagName === 'LI') {
                const childUl = item.querySelector('ul');
                if (childUl) {
                    removeEmptyLists(childUl);
                }
            }
        });
    }
    removeEmptyLists(tocList);

    const tocTitle = document.createElement('h2');
    tocTitle.textContent = 'Table of Contents';
    tableOfContents.appendChild(tocTitle);
    tableOfContents.appendChild(tocList);
});
    </script>

This script automatically generates a nested table of contents from the headings in the main element, which works seamlessly. The script automatically populates the table-of-contents aside tag, which I created earlier.

Finally, I added support for LaTeX formulas and equations by adding these script and link tags inside the head tag.

        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.4/dist/katex.min.css">
        <script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.4/dist/katex.min.js"></script>
        <script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.4/dist/contrib/auto-render.min.js"></script>
        <script>
            document.addEventListener("DOMContentLoaded", function () {
                renderMathInElement(document.body, {
                    delimiters: [
                        { left: "$", right: "$", display: false },
                        { left: "$$", right: "$$", display: true }
                    ]
                });
            });
        </script>

And with that, the content page is done. I like that the design is very minimal, doesn't distract from the content and still has all the necessary features.
If you want to see how, it looks in the live version, instead of just copying content yourself, see here: Periodicity Of Elements - Question and Answers

Hour 21 to 25: Completing a Chemistry Content Page

I'll create the periodicity-of-elements-notes.html file inside Chemistry/3/ folder. This will contain the notes on periodicity of elements.

    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Periodicity of Elements - Notes</title>
    <!-- styles and scripts -->


    <header>
        <nav>
            <div>



<p>This is the same base HTML structure as the previous file, periodicity-of-elements-qa.html. </p>

<p>Now, for the most time consuming part, copying over the massive text of the notes and formating it with headings, paragraphs, and lists. I've also used LaTeX syntax where appropriate.<br>
</p>

<pre class="brush:php;toolbar:false">            <h1>
                Structure of Periodic Table
            </h1>

            <h2>



</h2><p>I've added the base CSS from before, but I also added new CSS to style the calculator container, did I mention, this page also has a calculator, for interactivity:<br>
</p>

<pre class="brush:php;toolbar:false"> <style for="Calculator">
            /* Light Mode Styles */
            .calculator-container {
                background-color: #f5f5f5; /* Light background */
                padding: 20px;
                border-radius: 8px;
                box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* Subtle shadow */
                margin: 20px 0;
            }

            .calculator-controls {
                display: flex;
                gap: 10px;
                margin-bottom: 20px;
            }

            .calculator-controls input,
            .calculator-controls button {
                padding: 10px;
                border-radius: 4px;
                border: 1px solid #ccc; /* Light border */
                background-color: #fff; /* White background */
                color: #333; /* Dark text */
                transition: background-color 0.3s ease, box-shadow 0.3s ease; /* Added box-shadow transition */
            }

            .calculator-controls input:focus,
            .calculator-controls button:focus {
                outline: none;
                box-shadow: 0 0 5px #3498db; /* Focus highlight (same as dark mode) */
            }

            .calculator-controls input {
                flex: 2;
            }

            .calculator-controls button {
                flex: 1;
            }

            .calculator-controls button:hover {
                background-color: #e0e0e0; /* Slightly darker on hover */
                cursor: pointer;
            }

            #calculator-output {
                overflow-x: auto;
            }

            #calculator-output table {
                width: 100%;
                border-collapse: collapse;
                margin-top: 10px;
                box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1); /* Subtle shadow */
            }

            #calculator-output th,
            #calculator-output td {
                border: 1px solid #ccc; /* Light border */
                padding: 8px;
                text-align: left;
            }

            #calculator-output th {
                background-color: #3498db; /* Header color (same as dark mode) */
                color: white;
            }

            #calculator-output tr:nth-child(even) {
                background-color: #f0f0f0; /* Slightly darker for even rows */
            }

            #calculator-output tr:hover {
                background-color: #e8e8e8; /* Slightly darker on hover */
            }

            /* Loading Spinner */
            .loading-spinner {
                border: 4px solid #ccc; /* Light border */
                border-top: 4px solid #3498db; /* Spinner color (same as dark mode) */
                border-radius: 50%;
                width: 30px;
                height: 30px;
                animation: spin 1s linear infinite;
                margin: 20px auto;
                display: none;
            }

            @keyframes spin {
                0% {
                    transform: rotate(0deg);
                }
                100% {
                    transform: rotate(360deg);
                }
            }

            .calculator-container h2 {
                margin-top: 0;
                color: #333; /* Darker text color for heading */
            }
        </style>

This is a very basic style, but its fine for now.

Then, I added the JavaScript for the table of contents as before, and added a script to generate the table of the properties of elements:

   <script>
        document.addEventListener('DOMContentLoaded', function () {
        let elementInput = document.getElementById('element-input');
        let calculateBtn = document.getElementById('calculate-btn');
        let calculatorOutput = document.getElementById('calculator-output');

        const elementData = {
        "H": {
        "Hfg_298_15K": -241.8,
        "Hfg_0K": -217.8,
        "Entropy_298_15K": 130.7,
        "Integrated_Heat_Capacity_0_to_298_15K": 25.7,
        "Heat_Capacity_298_15K": 28.8,
        "Electronic_Energy_Levels": [1216.5, 1025.7],
        "Ionization_Energies": 13.6,
        "Electron_Affinity": 0.75
      },
        "He": {
        "Hfg_298_15K": 0,
        "Hfg_0K": 0,
        "Entropy_298_15K": 126.1,
        "Integrated_Heat_Capacity_0_to_298_15K": 20.8,
        "Heat_Capacity_298_15K": 20.8,
        "Electronic_Energy_Levels": [159850, 169084, 171133],
        "Ionization_Energies": 24.6,
        "Electron_Affinity": -0.08
        },
          "Li": {
            "Hfg_298_15K": 159.3,
            "Hfg_0K": 155.3,
            "Entropy_298_15K": 29.1,
            "Integrated_Heat_Capacity_0_to_298_15K": 22.8,
            "Heat_Capacity_298_15K": 24.8,
            "Electronic_Energy_Levels": [14908, 17159],
            "Ionization_Energies": 5.39,
            "Electron_Affinity": 0.61
            },
            "Be": {
                "Hfg_298_15K": 324.3,
                "Hfg_0K": 315.3,
                "Entropy_298_15K": 9.5,
                "Integrated_Heat_Capacity_0_to_298_15K": 16.8,
                "Heat_Capacity_298_15K": 16.7,
                "Electronic_Energy_Levels": [21978, 38178],
                "Ionization_Energies": 9.32,
                "Electron_Affinity": -0.20
            },
              "B": {
                    "Hfg_298_15K": 565,
                    "Hfg_0K": 561.5,
                    "Entropy_298_15K": 5.9,
                    "Integrated_Heat_Capacity_0_to_298_15K": 11.1,
                    "Heat_Capacity_298_15K": 11.1,
                    "Electronic_Energy_Levels": [38144, 38178],
                    "Ionization_Energies": 8.30,
                    "Electron_Affinity": 0.28
                },
                 "C": {
                    "Hfg_298_15K": 716.7,
                    "Hfg_0K": 711.2,
                    "Entropy_298_15K": 5.7,
                    "Integrated_Heat_Capacity_0_to_298_15K": 8.5,
                    "Heat_Capacity_298_15K": 8.5,
                    "Electronic_Energy_Levels": [10193, 21648],
                    "Ionization_Energies": 11.3,
                    "Electron_Affinity": 1.26
                },
                   "N": {
                    "Hfg_298_15K": 472.7,
                    "Hfg_0K": 472.7,
                    "Entropy_298_15K": 153.3,
                    "Integrated_Heat_Capacity_0_to_298_15K": 29.1,
                    "Heat_Capacity_298_15K": 29.1,
                    "Electronic_Energy_Levels": [19233, 28838],
                    "Ionization_Energies": 14.5,
                    "Electron_Affinity": -0.07
                 },
                  "O": {
                    "Hfg_298_15K": 249.2,
                    "Hfg_0K": 246.7,
                    "Entropy_298_15K": 161.1,
                    "Integrated_Heat_Capacity_0_to_298_15K": 29.4,
                    "Heat_Capacity_298_15K": 29.4,
                    "Electronic_Energy_Levels": [15867, 22698],
                    "Ionization_Energies": 13.6,
                    "Electron_Affinity": 1.46
                  },
                  "F": {
                    "Hfg_298_15K": 79.4,
                     "Hfg_0K": 77.2,
                    "Entropy_298_15K": 158.8,
                    "Integrated_Heat_Capacity_0_to_298_15K": 30.2,
                     "Heat_Capacity_298_15K": 30.2,
                     "Electronic_Energy_Levels": [404, 40889],
                    "Ionization_Energies": 17.4,
                     "Electron_Affinity": 3.40
                 },
                  "Ne": {
                      "Hfg_298_15K": 0,
                      "Hfg_0K": 0,
                      "Entropy_298_15K": 146.3,
                      "Integrated_Heat_Capacity_0_to_298_15K": 20.8,
                      "Heat_Capacity_298_15K": 20.8,
                       "Electronic_Energy_Levels": [134041, 136541, 138892],
                      "Ionization_Energies": 21.6,
                      "Electron_Affinity": -0.08
                  },
                "Na":{
                    "Hfg_298_15K": 107.3,
                     "Hfg_0K": 107.7,
                    "Entropy_298_15K": 153.7,
                    "Integrated_Heat_Capacity_0_to_298_15K": 44.4,
                     "Heat_Capacity_298_15K": 44.4,
                     "Electronic_Energy_Levels": [16956, 17293],
                     "Ionization_Energies": 5.14,
                    "Electron_Affinity": 0.54
                },
              "Mg":{
                "Hfg_298_15K": 147.7,
                "Hfg_0K": 146.2,
                "Entropy_298_15K": 32.7,
                "Integrated_Heat_Capacity_0_to_298_15K": 24.9,
                "Heat_Capacity_298_15K": 24.9,
                 "Electronic_Energy_Levels": [24581, 30994],
                "Ionization_Energies": 7.65,
                "Electron_Affinity": -0.30
            },
            "Al":{
                "Hfg_298_15K": 324.3,
                 "Hfg_0K": 324.1,
                "Entropy_298_15K": 28.3,
                 "Integrated_Heat_Capacity_0_to_298_15K": 24.4,
                  "Heat_Capacity_298_15K": 24.4,
                  "Electronic_Energy_Levels": [25057, 33951],
                 "Ionization_Energies": 5.99,
                  "Electron_Affinity": 0.43
              },
              "Si":{
                "Hfg_298_15K": 450.0,
                "Hfg_0K": 447.6,
                "Entropy_298_15K": 18.8,
                "Integrated_Heat_Capacity_0_to_298_15K": 20.2,
                 "Heat_Capacity_298_15K": 20.2,
                "Electronic_Energy_Levels": [6209, 14300],
                 "Ionization_Energies": 8.15,
                 "Electron_Affinity": 1.39
               },
                "P":{
                    "Hfg_298_15K": 314.6,
                    "Hfg_0K": 314.6,
                    "Entropy_298_15K": 163.2,
                    "Integrated_Heat_Capacity_0_to_298_15K": 27.3,
                     "Heat_Capacity_298_15K": 27.3,
                      "Electronic_Energy_Levels": [11828, 19553],
                     "Ionization_Energies": 10.5,
                      "Electron_Affinity": 0.75
                  },
                "S":{
                     "Hfg_298_15K": 278.3,
                     "Hfg_0K": 275.2,
                     "Entropy_298_15K": 167.7,
                    "Integrated_Heat_Capacity_0_to_298_15K": 29.2,
                     "Heat_Capacity_298_15K": 29.2,
                     "Electronic_Energy_Levels": [21394, 29394],
                     "Ionization_Energies": 10.4,
                      "Electron_Affinity": 2.08
                  },
                  "Cl":{
                     "Hfg_298_15K": 121.3,
                     "Hfg_0K": 119.1,
                     "Entropy_298_15K": 165.2,
                     "Integrated_Heat_Capacity_0_to_298_15K": 33.3,
                     "Heat_Capacity_298_15K": 33.3,
                       "Electronic_Energy_Levels": [882, 8823],
                      "Ionization_Energies": 13.0,
                       "Electron_Affinity": 3.62
                  },
                 "Ar": {
                      "Hfg_298_15K": 0,
                      "Hfg_0K": 0,
                     "Entropy_298_15K": 154.8,
                      "Integrated_Heat_Capacity_0_to_298_15K": 20.8,
                      "Heat_Capacity_298_15K": 20.8,
                     "Electronic_Energy_Levels": [93144, 93751, 95282],
                     "Ionization_Energies": 15.8,
                      "Electron_Affinity": -0.08
                  },
                  "K":{
                    "Hfg_298_15K": 89.2,
                     "Hfg_0K": 89.2,
                      "Entropy_298_15K": 160.3,
                       "Integrated_Heat_Capacity_0_to_298_15K": 46.2,
                      "Heat_Capacity_298_15K": 46.2,
                     "Electronic_Energy_Levels": [12985, 13042],
                      "Ionization_Energies": 4.34,
                     "Electron_Affinity": 0.50
                   },
                  "Ca":{
                      "Hfg_298_15K": 178.2,
                       "Hfg_0K": 177.3,
                       "Entropy_298_15K": 41.6,
                      "Integrated_Heat_Capacity_0_to_298_15K": 25.9,
                      "Heat_Capacity_298_15K": 25.9,
                      "Electronic_Energy_Levels": [15315, 23652],
                     "Ionization_Energies": 6.11,
                       "Electron_Affinity": -0.02
                  },
                  "Sc":{
                      "Hfg_298_15K": 0,
                       "Hfg_0K": 0,
                       "Entropy_298_15K": 33.2,
                      "Integrated_Heat_Capacity_0_to_298_15K": 3.80,
                      "Heat_Capacity_298_15K": 25.52,
                      "Electronic_Energy_Levels": [0, 11519.99],
                     "Ionization_Energies": 6.561,
                       "Electron_Affinity": 0.189
                  },
                  "Ti":{
                      "Hfg_298_15K": 473.00,
                       "Hfg_0K": 470.00 ,
                       "Entropy_298_15K": 180.30,
                      "Integrated_Heat_Capacity_0_to_298_15K": 7.54,
                      "Heat_Capacity_298_15K": 24.43,
                      "Electronic_Energy_Levels": [0, 170.132, 386.874, 6556.833, 6598.765, 6661.006, 6742.756, 6842.962, 7255.355, 8436.618, 8492.421, 8602.34],
                     "Ionization_Energies": 6.828,
                       "Electron_Affinity": 0.087
                  },
                  "Ti":{
                      "Hfg_298_15K": 473.00,
                       "Hfg_0K": 470.00 ,
                       "Entropy_298_15K": 180.30,
                      "Integrated_Heat_Capacity_0_to_298_15K": 7.54,
                      "Heat_Capacity_298_15K": 24.43,
                      "Electronic_Energy_Levels": [0, 170.132, 386.874, 6556.833, 6598.765, 6661.006, 6742.756, 6842.962, 7255.355, 8436.618, 8492.421, 8602.34],
                     "Ionization_Energies": 6.828,
                       "Electron_Affinity": 0.087
                  },
        };


        calculateBtn.addEventListener('click', function() {
            let selectedElement = elementInput.value.trim();
            if (!selectedElement) {
                alert('Please enter an element symbol.');
                return;
            }let normalizedElement = selectedElement.charAt(0).toUpperCase()   selectedElement.slice(1).toLowerCase();
            calculatorOutput.innerHTML = '<div>



<p>I've added a lot of content, along with the logic to generate the table of contents dynamically, and the logic to calculate the values for each element, for the calculator. Noah asked me if I could integrate basic calculator, for elements and their covalent radii and bond length. The page is now ready! Wanna see it, it is over here:<br>
Periodicity of Elements - Notes

<p>This marks the end of the coding for the day. I know, it feels a bit rushed, because it is. I couldn't accurately describe what all I did and why, because I don't remember most of that either. I just remember the basic changes.


          </script>