HTML attributes are used to provide additional information or modify the behavior of HTML elements. They are defined within the opening tag of an HTML element and consist of a name-value pair. Here are some commonly used HTML attributes:

1. **class**: Specifies one or more class names for an element. It is used to associate the element with CSS styles or JavaScript functions.
html
<div class="container">...</div>

2. **id**: Specifies a unique identifier for an element. It is often used to target specific elements with CSS or JavaScript.
html
<p id="myParagraph">...</p>

3. **style**: Defines inline CSS styles for an element. It allows you to specify properties like color, font-size, padding, etc., directly within the HTML tag.
html
<span style="color: red; font-weight: bold;">Hello</span>

4. **src**: Specifies the source URL of an external resource, such as an image or a script.
html
<img src="image.jpg" alt="Image">
<script src="script.js"></script>

5. **href**: Specifies the URL of a linked resource, such as a web page or a file.
html
<a href="https://www.example.com">Visit Example</a>
<a href="document.pdf">Download PDF</a>

6. **alt**: Provides alternative text for an image, which is displayed if the image cannot be loaded.
html
<img src="image.jpg" alt="Description of the image">

7. **disabled**: Disables an input field, button, or any interactive element, preventing user interaction.
html
<input type="text" disabled>
<button disabled>Click me</button>

8. **placeholder**: Displays a short hint or example text within an input field before the user enters a value.
html
<input type="text" placeholder="Enter your name">

9. **target**: Specifies where to open a linked resource. For example, "_blank" opens the link in a new window or tab.
html
<a href="https://www.example.com" target="_blank">Open in new tab</a>

These are just a few examples of HTML attributes. There are many more attributes available depending on the HTML element you are working with.

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