Are button HTML tags outside of a form valid?

The <button> tag is valid anywhere in the document body. This is valid only where text-level markup may appear.

In HTML, <input type="button" /> is used to create buttons in an HTML form. Inside the <button> tag, you can place content like text or images. However, this is not the case with the buttons created with <input> tag.

The button element has type=button as default outside the form. You can consider generating buttons via JavaScript instead as static HTML content. This is because when scripting is disabled, there will not be any chaos in checking button of no use.

The input type=button is equivalent to button type=button element. One does not have content but gets the text from the value attributes, whereas other has content.