Web Development

Common use cases include: • Comments • Feedback • Messages • Descriptions 13. Select Dropdown A dropdown can be created using <select> and <option>.

<label for="city">City</label>

<select id="city" name="city">
    <option value="pune">Pune</option>
    <option value="mumbai">Mumbai</option>
    <option value="delhi">Delhi</option>
</select>

14. Complete Form Example

<form>

    <label for="name">Full Name</label>
    <input
        type="text"
        id="name"
        name="name"
        required>

    <label for="email">Email</label>
    <input
        type="email"
        id="email"
        name="email"
        required>

    <label for="password">Password</label>
    <input
        type="password"
        id="password"
        name="password"
        required>

    <label for="city">City</label>
    <select id="city" name="city">
        <option value="pune">Pune</option>
        <option value="mumbai">Mumbai</option>
    </select>

    <label for="message">Message</label>
    <textarea
        id="message"
        name="message">
    </textarea>

    <button type="submit">Register</button>

</form>

15. How a Form Works A typical form flow is: User enters information ↓ HTML form ↓ Submit ↓ Browser sends data ↓ Backend receives data ↓ Backend processes it ↓ Database may store it ↓ Response sent back HTML creates the form, but HTML alone doesn't create a complete registration or login system. JavaScript and backend technologies will later handle more advanced behavior and data processing. 🧠 Remember <form> → Form container <label> → Describes an input <input> → Single-line input <textarea> → Multi-line input <select> → Dropdown <option> → Dropdown option <button> → Button required → Makes a value required Understanding forms is essential because almost every real-world web application needs to collect information from users. Double Tap ❤️ For More ----- 1.67 ₽ · /balance_help

🌐 Web Development Roadmap — Part 20 HTML Forms Forms allow users to enter and submit information on a webpage. You see forms everywhere: • Login pages • Registration pages • Search boxes • Contact forms • Checkout pages • Job applications • Feedback forms 1. The <form> Element A form is created using <form>.

<form>
    ...
</form>

Example:

<form>
    <label>Name</label>
    <input type="text">

    <button>Submit</button>
</form>

2. <label> <label> describes what an input field is for.

<label for="name">Name</label>
<input type="text" id="name">

The for value should match the input's id. label ↓ for="name" ↓ id="name" ↓ input This also improves accessibility and makes the form easier to use. 3. Text Input The most common input is a text field.

<input type="text">

A better version:

<label for="name">Full Name</label>
<input type="text" id="name" name="name">

4. Email Input

<label for="email">Email</label>
<input type="email" id="email" name="email">

The email type allows browsers to provide appropriate input behavior and basic validation. 5. Password Input

<label for="password">Password</label>
<input type="password" id="password" name="password">

The entered characters are normally hidden. 6. Number Input

<label for="age">Age</label>
<input type="number" id="age" name="age">

This is useful when the expected value is numeric. 7. Submit Button

<button type="submit">Submit</button>

When placed inside a form, this submits the form by default. You can also write:

<input type="submit" value="Submit">

However, <button> is generally more flexible. 8. Required Fields The required attribute tells the browser that a value must be provided.

<input
    type="email"
    id="email"
    name="email"
    required>

The browser can prevent submission when the required field is empty. 9. Placeholder placeholder provides a hint inside an input.

<input
    type="text"
    placeholder="Enter your name">

Important: a placeholder is not a replacement for a <label>. 10. Radio Buttons Radio buttons allow the user to select one option from a group.

<p>Gender</p>

<label>
    <input type="radio" name="gender" value="male">
    Male
</label>

<label>
    <input type="radio" name="gender" value="female">
    Female
</label>

The same name groups the radio buttons together. 11. Checkboxes Checkboxes allow users to select multiple options.

<label>
    <input type="checkbox" name="skills" value="html">
    HTML
</label>

<label>
    <input type="checkbox" name="skills" value="css">
    CSS
</label>

Unlike radio buttons, multiple checkboxes can be selected. 12. Textarea Use <textarea> for longer text.

<label for="message">Message</label>

<textarea
    id="message"
    name="message"
    rows="5"
    cols="30">
</textarea>

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The Finance cell spans two rows. 10. Tables vs Layout Tables should be used for tabular data. Good use: Employee | Department | Salary Not recommended: Using tables to position a website's navigation, images and buttons. Modern layouts should use CSS Flexbox and Grid instead. 🧠 Remember <table> → Entire table <tr> → Table row <th> → Header cell <td> → Data cell <thead> → Header section <tbody> → Main data section <tfoot> → Footer/summary section Key Takeaway A semantic table usually follows this structure:

<table>
   ↓
<thead> → column headings
   ↓
<tbody> → actual data
   ↓
<tfoot> → totals/summary

HTML tables are primarily about representing relationships between rows and columns. CSS will later control how the table looks. Double Tap ❤️ For More ----- 2.64 ₽ · /balance_help

🌐 Web Development Roadmap — Part 19 HTML Tables Tables are used to display information in rows and columns. For example, a website might use a table to display: • Employee information • Product details • Exam results • Prices • Sales data • Schedules 1. Basic Table Structure A simple HTML table looks like this:

<table>
    <tr>
        <th>Name</th>
        <th>Role</th>
    </tr>

    <tr>
        <td>Rahul</td>
        <td>Developer</td>
    </tr>

    <tr>
        <td>Priya</td>
        <td>Designer</td>
    </tr>
</table>

The structure is:

<table>
   ↓
<tr> → Table Row
   ↓
<th> → Header Cell
<td> → Data Cell

2. <table> The <table> element defines the entire table.

<table>
    ...
</table>

Everything belonging to the table goes inside it. 3. <tr> — Table Row <tr> creates a row.

<tr>
    <td>Rahul</td>
    <td>Developer</td>
</tr>

Each <tr> represents one horizontal row. 4. <th> — Table Header <th> represents a header cell.

<tr>
    <th>Name</th>
    <th>Age</th>
    <th>City</th>
</tr>

Browsers typically display header cells in bold. 5. <td> — Table Data <td> represents normal data.

<tr>
    <td>Rahul</td>
    <td>25</td>
    <td>Pune</td>
</tr>

6. Understanding the Structure Consider:

<table>
    <tr>
        <th>Name</th>
        <th>Department</th>
    </tr>

    <tr>
        <td>Amit</td>
        <td>Finance</td>
    </tr>
</table>

7. <thead>, <tbody> and <tfoot> For larger or more structured tables, HTML provides sections.

<table>

    <thead>
        <tr>
            <th>Product</th>
            <th>Price</th>
        </tr>
    </thead>

    <tbody>
        <tr>
            <td>Laptop</td>
            <td>₹60,000</td>
        </tr>

        <tr>
            <td>Phone</td>
            <td>₹30,000</td>
        </tr>
    </tbody>

    <tfoot>
        <tr>
            <td>Total</td>
            <td>₹90,000</td>
        </tr>
    </tfoot>

</table>

The structure becomes:

<table>
 ├── <thead>
 │    └── Header rows
 │
 ├── <tbody>
 │    └── Main data rows
 │
 └── <tfoot>
      └── Summary/footer rows

8. colspan colspan allows a cell to span multiple columns.

<tr>
    <td colspan="2">Total Sales</td>
</tr>

Here the cell occupies two columns. 9. rowspan rowspan allows a cell to span multiple rows.

<tr>
    <td rowspan="2">Finance</td>
    <td>Rahul</td>
</tr>

<tr>
    <td>Priya</td>
</tr>

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🌐 Web Development Roadmap — Part 18 HTML Lists — , & 1. Lists are used whenever information needs to be presented as a group of related items. 1. Unordered List An unordered list displays items with bullets.

<ul>
    <li>HTML</li>
    <li>CSS</li>
    <li>JavaScript</li>
</ul>

It produces: • HTML • CSS • JavaScript <ul> means unordered list. 2. List Item Each item inside a list uses <li>. <li>HTML</li> Think of it as: <ul> → List container ↓ <li> → Individual item 3. Ordered List An ordered list displays items in a sequence, usually using numbers.

<ol>
    <li>Learn HTML</li>
    <li>Learn CSS</li>
    <li>Learn JavaScript</li>
</ol>

It produces: 1. Learn HTML 2. Learn CSS 3. Learn JavaScript <ol> means ordered list. 4. When to Use Which? Use <ul> when order doesn't matter:

<ul>
    <li>Apples</li>
    <li>Bananas</li>
    <li>Oranges</li>
</ul>

Use <ol> when order or sequence matters:

<ol>
    <li>Create an account</li>
    <li>Verify your email</li>
    <li>Log in</li>
</ol>

5. Nested Lists A list can contain another list.

<ul>
    <li>
        Frontend
        <ul>
            <li>HTML</li>
            <li>CSS</li>
            <li>JavaScript</li>
        </ul>
    </li>

    <li>
        Backend
        <ul>
            <li>Node.js</li>
            <li>Express</li>
        </ul>
    </li>
</ul>

The structure becomes: • Frontend • HTML • CSS • JavaScript • Backend • Node.js • Express 6. Lists in Navigation Lists are commonly used to structure navigation menus.

<nav>
    <ul>
        <li><a href="index.html">Home</a></li>
        <li><a href="about.html">About</a></li>
        <li><a href="contact.html">Contact</a></li>
    </ul>
</nav>

CSS can later transform this into a horizontal navigation bar. 7. Lists in Real Websites Lists are useful for many things: • Shopping items • Features • Navigation menus • Steps • Skills • Categories • Search results • Product specifications For example:

<h2>My Skills</h2>

<ul>
    <li>HTML</li>
    <li>CSS</li>
    <li>JavaScript</li>
    <li>React</li>
</ul>

8. Important Rule <li> should normally be used as a child of a list such as <ul> or <ol>. Good:

<ul>
    <li>HTML</li>
    <li>CSS</li>
</ul>

Not appropriate:

<li>HTML</li>
<li>CSS</li>

🧠 Remember <ul> → Unordered list → Bullets <ol> → Ordered list → Numbers/sequence <li> → List item → Individual item Key Takeaway

<ul>
   ↓
Unordered group
   ↓
<li> Item
<li> Item
<li> Item

and

<ol>
   ↓
Ordered group
   ↓
<li> Step 1
<li> Step 2
<li> Step 3

🌐 Web Development Roadmap — Part 17 HTML Images — <img> Tag Images make webpages more visual and engaging. HTML provides the <img> element to display images. 1. Adding an Image

<img src="photo.jpg" alt="A beautiful landscape">

Unlike elements such as <p>, <img> does not need a closing tag. 2. The src Attribute src stands for source. It tells the browser where the image is located.

<img src="images/profile.jpg" alt="Profile photo">

The browser follows the path:

HTML
 ↓
src="images/profile.jpg"
 ↓
images folder
 ↓
http://profile.jpg
 ↓
Display image

3. The alt Attribute alt provides alternative text describing the image.

<img src="profile.jpg" alt="Profile photo">

It is important for accessibility and can also be displayed if the image cannot be loaded. A good alt describes the actual image:

<img src="dog.jpg" alt="Golden retriever sitting in a park">

Avoid unnecessary descriptions such as:

alt="image"

4. Images Inside Folders Suppose your project looks like:

my-website/
├── http://index.html
├── http://style.css
└── images/
    ├── http://logo.png
    └── http://profile.jpg

You can write:

<img src="images/logo.png" alt="Company logo">

5. Image Dimensions You can specify dimensions using width and height attributes:

<img
    src="profile.jpg"
    alt="Profile photo"
    width="300"
    height="300">

However, modern websites commonly use CSS to control presentation and responsive sizing. 6. Absolute vs Relative Image Paths Relative path:

<img src="images/photo.jpg" alt="Photo">

This refers to a file within your project. An external image can use a full URL:

<img
    src="https://example.com/photo.jpg"
    alt="Example photo">

For real projects, images are often hosted as part of your application or through an image/CDN service. 7. Images as Links You can place an image inside an anchor element:

<a href="https://example.com">
    <img src="logo.png" alt="Example website">
</a>

Now clicking the image follows the link. 8. Decorative Images Not every image provides meaningful information. For a purely decorative image, an empty alt is appropriate:

<img src="decorative-line.png" alt="">

This tells assistive technologies that the image can be ignored. 9. Common Image Formats You will commonly encounter: JPEG / JPG → Photos PNG → Transparency and graphics SVG → Logos and scalable graphics WebP → Modern web images AVIF → Modern, highly compressed images GIF → Simple animations The appropriate format depends on the type of image and performance requirements. 10. Complete Example

<!DOCTYPE html>

<html>
<head>
    <title>My Portfolio</title>
</head>

<body>

    <h1>My Portfolio</h1>

    <img
        src="images/profile.jpg"
        alt="Profile photo"
        width="300"
        height="300">

    <h2>My Projects</h2>

    <img
        src="images/project.png"
        alt="Screenshot of my web development project">

</body>
</html>

🧠 Remember

<img>
  ↓
Displays an image

src
  ↓
Where the image comes from

alt
  ↓
Alternative description

width / height
  ↓
Image dimensions

Key Takeaway The basic image structure is:

<img src="image.jpg" alt="Description of image">

The two most important attributes to remember are: src → image location alt → meaningful alternative text Double Tap ❤️ For Part-18