I am looking for a free, usable without registration, online web text editor tha

Question

I am looking for a free, usable without registration, online web text editor that...

supports a vertical split pane. I want be able to write different text on both vertical panes and thus being able to compare them visually.
plain ASCII support is sufficient. No extra bells and whistles needed/wanted.
no special features for search/replace required (Ctrl+F from the browser is fine)

As a bonus but not necessary:

Markdown formatting support
Visual highlighting of text differences (diff tool) such as provided by for instance Meld

Do you know of any web application that offers that?

Explanation / Answer

You can create your own pretty easily if you have a html 5 compatible browser. Just create an html file with the following markup.

<div>
<div>
<div contenteditable>Lorem Ipsum</div>
<div contenteditable>Lorem Ipsum</div>
</div>
</div>

The part that makes it editable is the attribute contenteditable. If the width of the columns is not what you want, you can change the width of the first column which is currently 300px.

You can see a demo of this on jsfiddle. Click on the text to edit.

If you want something fancier, you could check out Aloha Editor. Here is a demo of the editor being used with divs that you could control.

Also, there are lots of online diff tools, for example, Diff Checker, Quick Diff, Diff Now, Pretty Diff, and Text Compare.

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