Discussing possibilities of a 'CSS-ignore' rule.

Hello there!

I am Ketan, 23. I am a web developer based in India. I am freelancer at *
digit*, which is the leading technology magazine published in India.
I've been working on a project this week, which has a PHP script that is
meant to open a popup window that contains a 'template' with dynamically
generated values plugged in. The template was originally generated by
Microsoft Word 2010, using the 'html, featured' (or something like that)
saving option. The reason why I went for it instead of using CSS on HTML
markup, is because of the complexity of the tables that had to be created,
and I am sort of running short of time.
The tricky part started when I decided to insert the project's theme
'header' and 'footer' into that popup, which required me to include the css
file on it as well. Now that the external css file is hooked up with with
the popup, I have kind of, lost control on the styling that was originally
generated by Microsoft word. Though most of the template markup has inline
definitions, still some parts are not showing up as expected.

This makes me feel a need for something that could be called 'css-ignore'.
E.g. If I had a *div *with id 'my_div', I could have used something like
#my_div{  css-ignore:external;  } which could have asked the browser not to
associate any external style sheets with 'my_div'. The css-ignore rule
could have possible values such as 'inline', 'internal', 'external', which
could make the browser ignore css of a certain 'kind' for a particular
selection of elements.
I guess, there are many possible ways this can be achieved, many of them
kind of 'hackish' like tweaking it using jQuery; but having a proper
legitimate rule for it would certainly be helpful for many of us.
In addition, it can also be a great tool for developers, who might need it
to test their codes, in case they don't have a proper debugger.

I'd like to apologize in advance in case something similar to this already
exists. I couldn't spare much time to research on this topic.
In case there isn't anything similar to this, I'd love to discuss how this
can be taken forward.
Waiting for hearing from you!

Regards,
Ketan Singh