Support to block Iframes

[amon-ra]

This changes blocks cookies from iframes using the sandbox option.

[elbywan]

Hi @amon-ra, thanks a lot for your contribution! 👍

Before we can go in depth and review/evaluate the code/features, could you please:

• provide us with some concrete use case
• add further explanation about the features you are adding - for instance document the api
• make unitary pull requests with one single feature (here I can see at least 2 features at first glance: iframe blocking & unblocking by id)
• make sure that your code contains comments (if needed)

Thanks again, and please let us know when you feel that your PR fullfills these requirements so we can pursue.

[amon-ra]

Sorry for the late response. I have been working, a link, in a big change to support advanced patterns and block other elements apart of scripts. The syntax used is a string in the form 'element_type:tag/regex/actions'. For example 'iframe:src/blockeddomain/sandbox:allow-scripts' Needs some more testing but it is in a working state. Sorry no to fulfills your requirements but this is one big feature, I will try to document in more detail. Thanks for your work.

[vladiiancu]

Any updates here?