Remove impossible selectors

[clarfonthey]

I use partial selectors in SASS which sometimes produces impossible selectors if you're not careful. These selectors are valid syntax but can never match an element, so, can safely be removed.

A few examples I thought of:

• tag:not(tag)
• :matches(h1):matches(h2)
• html html (assuming well-formed HTML)
• p div (again, assuming well-formed HTML)
• ...

[chrisdothtml]

Do you really have enough impossible selectors in your codebase to notice a bundle size benefit from removing them?

[clarfonthey]

@chrisdothtml yes. :not especially, as I use %partial:not(%other) in a few places. Sure, there are ways of getting around this and I have also suggested removing these during compilation in sass, but I think that having the option of removing these in minification tools is also a good idea, even if not enabled by default.

[andyjansson]

Closing this due to being an issue which is likely difficult to implement and which provides very little value.