Void elements

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HTML 4.01/XHTML 1.0 Strict includes the following void elements:

HTML 5 standards include all non-deprecated tags from the previous list and

The example below does not include void elements:

    <a href="http://stackoverflow.com/">
        <h3>Click here to visit <i>Stack Overflow!</i></h3>
    <button onclick="alert('Hello!');">Say Hello!</button>
    <p>My favorite language is <b>HTML</b>. Here are my others:</p>

Notice how every element has an opening tag, a closing tag, and text or other elements inside the opening and closing tags. Void tags however, are shown in the example below:

<img src="https://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-icon.png" />
<input type="number" placeholder="Enter your favorite number">

With the exception of the img tag, all of these void elements have only an opening tag. The img tag, unlike any other tag, has a self closing / before the greater than sign of the opening tag. It is best practice to have a space before the slash.

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