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Comment by publicfig | Hacker News Reader

I agree, I'm not sure what postprocessor would even mean in this context.

I think they chose "post-process" based on the following feature:

  Taking plain CSS as an input also means you can use Myth to post-process anyone else's CSS, adding the browser support you need, without having to re-write their code in a completely different syntax.

What distinguishes it from LESS or SASS or whatever is that the input has to be valid CSS, as well as the output. Their claim is that it makes your CSS act now like it will in the future once the version of the spec they're targeting has been fully adopted.

Or maybe they were thinking visual post-processing: http://en.wikipedia.org/wiki/Video_post-processing

To me they chose the wrong word, they are still preprocessing because current css engines don't accept future css. Therefore it must be preprocessed by Myth before its usable in the browser.

LESS, SASS and rework/stylus are all supersets of CSS, so they can too "post-process" anyone else's CSS.

That would be a noop with LESS/SASS unless the input CSS was not a "valid" CSS.

This project will "enhance" "normal" CSS to take care of polyfill, which alone is a win. Take any CSS file you got, and it suddenly has all browser prefixes thanks to this tool. This is something LESS/SASS can not do.

Styl(us) can. My point is that calling it a 'post-processor' is a misnomer.

Preprocessor: non css => css (e.g. less, sass)

Postprocessor: css => better css (e.g. myth, ?)

I think you mostly hit the mark, although wouldn't it be:

future css => compatible css ?

The reading I think they are going for is that preprocessors generate CSS from something else, while this uses (the platonic ideal of "true") CSS and generates the shambled code that the browser needs. But I could be way off.

I think the idea is that, instead of writing x other style language (SASS, LESS, etc.) that is turned into css, you write css that turns into different css. This means you can use other SASS/LESS/etc... and myth together.

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