HTML5 placeholder attribute used to hold default even after value change?

1. What does the HTML5 placeholder attribute?
2. Which attribute is used to fill in a default value for a form input?
3. How is a placeholder attribute different from a value attribute?

What does the HTML5 placeholder attribute?

The placeholder attribute specifies a short hint that describes the expected value of an input field (e.g. a sample value or a short description of the expected format). The short hint is displayed in the input field before the user enters a value.

Which attribute is used to fill in a default value for a form input?

The defaultValue property sets or returns the default value of a text field. Note: The default value is the value specified in the HTML value attribute.

How is a placeholder attribute different from a value attribute?

The value attribute puts actual content inside of a form, so if you want to change it you have to delete it first. While the placeholder attribute puts an image of content inside of a form, so when you click on the box and start typing it disapears.