It really depends on your intention writing your question!
Are you looking to make your code work on other browsers? If so, you're looking for someone to write a new feature/fix bugs for you, in this case CodeReview isn't the right spot.
Are you looking to make your existing code better, knowing that it doesn't work in every browser? That's on-topic, but ...
These are covered in multiple questions
Should a post with no specific question(s) imply a general review?
Should [programming-challenge] questions require a summary of the challenge?
Should design questions be on-topic here?
If there is little/no code:
Can I ask a question ...
Can I ask a question about a custom scripting language?
Yes, if there is a compiler / transpiler / interpreter that we can obtain to run the language through.
I translated it because I felt the original code would have been confusing.
If we can review BrainFuck and LOLCODE I think we can handle some old looking language. If we can find out what it is and ...
While I will answer your raised concerns one-by-one and it's perfectly possible to get your project reviewed, I'm not convinced Code Review is your best bet.
Does Code Review allow for posting (or linking to) entire projects?
Posting? Yes. Provided it fits within our character-limit of a post. The code must be in the post itself. We don't review entire ...
Re. the original modal dialog: I think most users will immediately close a box entitled "Asking a good question" followed by a bunch of waffley text. Ain't nobody got time for that.
That useless bold title and the text below it need to go away, and the important things (the bullet points) need to be in a larger font. Something more like:
Welcome to ...
I don't think linking directly to the guide to posting is a good idea.
It's fairly verbose, it's quite literally a wall of text. Whilst this is undoubtebly good for people that want to get the most out of their post it's just going to make the average Joe run.
It doesn't actually tell the user anything that is off-topic. The link only contains site policy ...