Can the action attribute on a form element be empty?

Question

As of HTML5, the widely used and recommended action="" is invalid HTML.

From the specs:

The action and formaction content attributes, if specified, must have a value that is a valid URL.

So what is the correct way to have the action attribute point to the current page?

I am currently using

action="<php htmlspecialchars($_SERVER["REQUEST_URI"]); ?>"

Answer 1

It's true that the action= attribute may not be empty, as an empty string is not a valid URL. However, it is valid to simply leave it out, and let the browser figure it out.

The browser will assume the current page.

Answer 2

You can set value to '.' or do not set action attribute at all.

<form method="post">
or
<form method="post" action=".">

(I was surprise but it is really invalid to leave it blank, at least validator.w3.org is returning error).

Answer 3

不可以，在HTML5中，可以省略action属性 ，它默认为emoty字符串，表示对当前文档的引用。