Thank you for answer my question.
But this situation is more complex.
Firstly, Yes I know above html sample Ex1) is not respect for W3C specification refer to CSS Selector name.
But this file generated by MS-Word 2010 and I dare to upload it
because of respecting for peculiar Microsoft rule.
(Sorry, I forgot to describe this special case.)
Your suggestion is correct, this special CSS selector name "p.1" is invalid and should be repared.
So I already tried to develop code to rename this selector name intermidiately.
Thecondly, I tried to load below sample Ex3) is edited CSS selector name p.1 to p.hoge.
But Telerik Html Format Provider class does not apply for CSS style sheet parameter.
<body lang=JA style='text-justify-trim:punctuation'>
<div class=WordSection1 style='layout-grid:18.0pt'>
<p class=hoge>Sample Strings</p>
This Ex3) and above Ex2) are different in using CSS Style Sheet not CSS Style.
CSS Style Sheet is comment out terms <!-- --> for old web browsers they are not support CSS Style.
So I want to ask most important thing
that Telerik Html Format Provider is support OR not support for CSS Style Sheet.
If It's not support Style Sheet then I need to fix my code to convert from CSS Style Sheet to pure CSS Style.
If It is (OR will be) support Style Sheet, and I don't understand wise way to avoid this problem, Please tell me.