CKEditor HTML Autocorrection Issue - ckeditor

I have few lines of HTML in my database. I want to edit the content in CKEditor. But when I open that in editor the HTML gets break down. The HTML gets rearranged.
Below is the HTML which is in database:
<span class="sec_title">
<h1><span>Web</span> Engineering</h1>
<hr>
</span>
And when I open it in CKEditor the HTML looks likes below:
<h1><span class="sec_title"><span>Web</span> Engineering</span></h1>
<hr />
Some one please help me. I tried config.allowedContent = true; but it is also not stopping the CKEditor to do the modifications.

CKEditor works with a valid HTML only and <h1> is not a valid content of <span>. Quoting CKEditor basic concepts:
CKEditor is not a tool that will let you input invalid HTML code. CKEditor abides by W3C standards so it will modify code if it is invalid.

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CKEditor is not a tool that will let you input invalid HTML code. CKEditor abides by W3C standards so it will modify code if it is invalid.

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This doc at the CKEditor howto shows how you can modify the formatting of the output, so you just have to specify the rules that you want: http://docs.cksource.com/CKEditor_3.x/Howto/FCKeditor_HTML_Output

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