Option to ignore elements with CSS selectors

[pawamoy]

Is your feature request related to a problem? Please describe.
Some HTML elements should not be checked, see #5, #6 and #7.

Describe the solution you'd like
Instead of #5, #6 and #7, we could add an option to ignore elements by selecting them with CSS selectors.
I guess we would need a library for that, because I don't have the ability to write a full, correct CSS selector.
It might also be hard to fit this in the HTML stripper.

Describe alternatives you've considered
Simple options like #5, #6 and #7.

Additional context
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[Archmonger]

On the note of this issue, if you decide to develop this I highly recommend using lxml for performing CSS selector queries.