What attribute within an <input> tag is used to specify the expected input type (e.g., email, number)?

The attribute within an <input> tag that is used to specify the expected input type (e.g., email, number) is the "type" attribute. Here's how you would use it:

1. Start with the <input> tag: <input>
2. Add the "type" attribute, followed by an equals sign: <input type=
3. Specify the expected input type in quotes. For example, if you're expecting an email, you would write: <input type="email">

So, if you want the user to input an email, the tag would look like this: <input type="email">. If you want the user to input a number, the tag would look like this: <input type="number">.