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At first I thought, great, where's the demo?

Then I realised it was the demo. Cool idea to make the about page the demo.

This looks like it hasn't been worked on in a while.

How do you save your document?

It's meant to be used as part of a web form, so just submitting the form would save the proper HTML code.

Alternatively, you could use JavaScript to get the value of the input. It's just an HTML textarea element.

Wysihtml5 - A better approach to rich text editing