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I was looking at jsfiddle's code and saw these lines:
<meta name="description" edit="mootools shell, easy test you snippets before implementing">
<meta name="keywords" edit="mootools,javascript,javascript framework,shell,test">
<meta name="robots" edit="all">
I've never seen the edit attr before. What does it do? I couldn't find any info on w3.org or google
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Note: In HTML5, id attributes can be used by any HTML tag but in HTML 4.01 there are some restriction to use id attributes. It can not be used by <base>, <head>, <html>, <meta>, <param>, <script>, <style>, and <title> tag.
Search engines such as Google use metadata from meta tags to understand additional information about the webpage. They can use this information for ranking purposes, to display snippets in search results, and sometimes they can ignore meta tags. Example of meta tags include the <title> and <description> elements.
<meta content=""> Defines the values for the meta element. The content attribute of the meta element contains its values. This is used with the name attribute to specify metadata about the page.
I would bet it's just mistake on their part and the "edit" attribute should have been "content". Maybe you should send them a note and let them know.
Update: I just sent Piotr a note, letting him about it. I'll update my answer with his response (if any).
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