What does target "_help" do?

Question

I'm having hard time to find information related to target="_help" on the Internet. So, when I have an HTMLAnchorElement like this:

<a href="http://www.google.com" target="_help"></a>

I can see that this thing is actually behaving like target="_blank", but anything else?

Could not find anything on MDN. Also no mention on the HTML5 Spec and detailed W3C Browsing Context page.

Answer 1

According to the MDN:

This attribute specifies where to display the linked resource. In HTML4, this is the name of, or a keyword for, a frame. In HTML5, it is a name of, or keyword for, a browsing context (for example, tab, window, or inline frame).

That means that click on a

<a href="http://www.google.com" target="_help"></a>

instructs iframe named _help to set src value to the value of href. The example below loads youtube video:

<a href="http://www.youtube.com/embed/M7lc1UVf-VE" target="_help">Help</a>
<iframe name="_help"></iframe>

JSBin.

On a side note, this feature looks pretty obscure, I did not know about it before your question.