Wordpress strips out <textarea> tag

I have some HTML code within Wordpress where I am using the <textarea> tag. It works fine as long as the only editing is done in the "text" area of the edit page. But if you switch to the "visual" tab it strips that tag out.

I realize there is probably a simple answer to this, if someone could clue me in please.
Oscar9ertangoAsked:
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Jason C. LevineDon't talk to me.Commented:
Yes, WordPress fires a function whenever you publish or switch tabs that can blow away the HTML markup.

Try this plugin:

wordpress.org/plugins/preserved-html-editor-markup/

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