In HTML, the <span> tag is used to group inline elements and apply styles or add a class to them. It does not have any specific effect on its own. To use it, you simply need to open and close the <span> tags and place the content you want to group or style in between them.

Here is an example of how to use the <span> tag:

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<p>This is a <span style="color: blue;">blue</span> text.</p>

In this example, the word "blue" will appear in blue color because we applied the CSS color: blue; property to the <span> tag. You can also add a class to the <span> and style it using external CSS or add other attributes to it as needed.

Remember, the <span> tag is used for grouping and applying styles to inline elements. If you want to apply styles to block-level elements, you may need to use other tags like <div> instead.

To center a span tag you can use CSS to apply the text-align property to the parent container of the span tag and set its value to center. Here's an example using inline CSS:

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<div style="text-align: center;">
  <span>Hello World!</span>
</div>

You can also create a CSS class and apply it to the parent container of the span tag. Here's an example using CSS:

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<style>
.center {
  text-align: center;
}
</style>

<div class="center">
  <span>Hello World!</span>
</div>

Both of these approaches will center the content of the span tag horizontally within its parent container.

To adjust an <img> tag with a <span> tag you can use CSS to change the styling. However, it's important to note that the <img> tag is a self-closing tag, which means it doesn't have a closing tag. So, you can't nest a <span> tag inside an <img> tag. Instead, you can wrap the <img> tag with a <span> tag and apply the styles to the <span> tag. Here is an example:

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<span class="image-wrapper">
  <img src="your-image-source" alt="your-image-alt-text">
</span>

Then you can use CSS to style the .image-wrapper class, and it will affect the <img> tag inside it. For example, you can use CSS to adjust the width and height of the <img> tag:

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.image-wrapper img {
  width: 100%;
  height: auto;
}

This will make the image responsive and adjust to the width of the wrapper.

In HTML, the <span> tag is used to group inline-elements in a document. It's a container element that doesn't have any semantic meaning or affect the content of a document. It's mostly used to apply styles to specific parts of text or to manipulate the layout of elements on a page. Here's an example of a span tag in HTML:

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<p>My favorite color is <span style="color: blue;">blue</span>.</p>

In this example, the text "blue" is enclosed in a <span> element with a style attribute that changes its color to blue.

Here's an example of using the span tag in HTML:

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<p>This is a <span style="color: red;">red</span> word.</p>

In this example, the word "red" is wrapped inside a span element and styled with a red color using the style attribute.

You can also apply a class or an ID to the span element for more targeted styling with CSS:

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<p>This is a <span class="highlight">highlighted</span> word.</p>

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.highlight {
  background-color: yellow;
  font-weight: bold;
}

In this example, a class named highlight is added to the span element, and its background color is set to yellow and its font weight to bold using CSS.