div and span in html and difference between div and span elements

div and span are both HTML elements used to group and apply styles to HTML content.

div is a block-level element, which means that it creates a new block formatting context and takes up the full width of its parent container. 

It's commonly used to group other elements together in order to apply styles or layout to them as a group.

span is an inline element, which means that it only takes up as much width as necessary and does not create a new block formatting context. 

It's commonly used to apply styles to small groups of inline elements, such as a few words within a sentence.

In short, div is a container for HTML elements, and span is used to group small parts of the HTML document together.

The main difference between these two elements is that div is a block-level element, while span is an inline element. 

This means that div will create a new line after it, while span will not.

An example of using a div to group elements together and apply styles:

<div style="background-color: red; padding: 20px;">

  <h1>Welcome to my website</h1>

  <p>This is a simple example of using a div to group elements together and apply styles.</p>

  <ul>

    <li>Item 1</li>

    <li>Item 2</li>

    <li>Item 3</li>

  </ul>

</div>

In this example, the div element is used to group the h1, p, and ul elements together. A background color of red and padding of 20 pixels is applied to the entire group using the style attribute.

An example of using a span to apply styles to a small group of elements:

<p>This is an example of using a <span style="color: blue;">span</span> element to apply styles to a small group of elements.</p>

In this example, the span element is used to apply a blue color to the word "span" within the sentence.