Add support to escape non-html tags

[thedroiddiv]

Purpose/Description

Sometimes tags contain an invalid tag, which is not part of standard HTML tags. API can provide a way to optionally skip/escape these tags.

Suggested approach

This can be by replacing the corresponding <, > and & chars with &lt, >, &

[cbeyls]

The library already skips unknown tags.

And you can also escape tags yourself before calling the library.

Do you have an example of incorrect input and the output you expect?

[thedroiddiv]

Hey, I meant skip parsing but not rendering.
For example some random <ht> ml tag, currently <ht> won't show up. What I'm suggesting is render <ht> as <ht>

I had a custom parser for a very limited set of tags which I was using and I had a flag to optionally skip rendering or not any invalid html tag.

Let me know if this sounds something feasable, happy to raise a PR too :)

[cbeyls]

The goal of this library is to render html like a browser, not to sanitize or transform input. Browsers don't escape invalid html tags to display them, they ignore them.

If you want to do custom sanitizing, you should do it before feeding the library. Note that the library also supports supplying your own HTML parser so you could also roll your own and do some sanitizing on-the-fly if that's what you want.