CSS::Minifier::XS(3)

💖 CSS::Minifier::XS 💖

okay bestie, so this is the manual page for CSS::Minifier::XS, which lives in your friendly neighborhood User Contributed Perl Documentation section. it's a perl thing, it's a CSS thing, it's giving glow up for your stylesheets. let's get into it 🫶

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✨ NAME ✨

CSS::Minifier::XS — an XS based CSS minifier. that's it, that's the name, and yes the XS part is the whole personality 💅

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🌸 SYNOPSIS 🌸

use CSS::Minifier::XS qw(minify);
my $css      = '...';
my $minified = minify($css);

look at that. four lines. immaculate. 🎀

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🦋 DESCRIPTION 🦋

CSS::Minifier::XS is a CSS "minifier" — and the way it works is that it's designed to remove unnecessary whitespace and comments from CSS files, while also not breaking the CSS. which is, like, the important part. nobody wants a minifier that minifies your whole website into a broken little puddle. 💀

CSS::Minifier::XS is similar in function to CSS::Minifier, but it's substantially faster, because it's written in XS and not just pure Perl. speed demon energy, no cap 🔥

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👑 METHODS 👑

• minify($css) — minifies the $css you hand it, and returns the minified CSS right back to you, the caller. give it CSS, get CSS back. the circle of life. 🌈

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🧚 HOW IT WORKS 🧚

so CSS::Minifier::XS minifies the CSS by removing unnecessary whitespace from CSS documents. comment blocks also get removed — except when (a) they contain the word "copyright" in them, or (b) they're needed to implement the "Mac/IE Comment Hack". those two get a pass, they're the main characters of comments. 👑

internally, the minification is done by taking multiple passes through the CSS document. four of them. a whole little assembly line. ⭐

🍓 Pass 1: Tokenize

first, we go through and parse the CSS document into a series of tokens internally. heads up though — the tokenizing process does not check to make sure that you've got syntactically valid CSS. it just breaks up the text into a stream of tokens suitable for processing by the subsequent stages. it's not a vibe check on your syntax, it's just vibes. 🙈

💜 Pass 2: Collapse

we then march through the token list and collapse certain tokens down to their smallest possible representation. if they're still included in the final results we only want to include them at their shortest. tiny. compact. adorable. ✨

Whitespace

runs of multiple whitespace characters are reduced down to a single whitespace character. if the whitespace contains any "end of line" (EOL) characters, then the end result is the first EOL character encountered. otherwise, the result is the first whitespace character in the run. basically: one survivor per group. 💅

Comments

comments implementing the "Mac/IE Comment Hack" are collapsed down to the smallest possible comment that would still implement the hack — that's /*\*/ to start the hack, and /**/ to end it. minimal, but still doing its job. iconic. 🎀

Zero Units

Zero Units (e.g. 0px) are reduced down to just 0, because the CSS specification indicates that the unit is not required when it's a zero value. the unit said "I'm not needed here" and honestly, respect. 😭

🌟 Pass 3: Pruning

we then go back through the token list and prune and remove unnecessary tokens. glow-up via subtraction. 🦋

Whitespace

wherever possible, whitespace is removed: before+after comment blocks, and before+after various symbols/sigils. gone. bye. 💨

Comments

comments that either (a) are needed to implement the "Mac/IE Comment Hack", or that (b) contain the word "copyright" in them are preserved. all other comments are removed. sorry to the rest of you, it's not personal, it's pruning. 💀

Symbols/Sigils

semi-colons that are immediately followed by a closing brace (e.g. ;}) are removed. semi-colons are needed to separate multiple declarations, but aren't required at the end of a group. last one at the function said "I'm done" and left. 🫶

Everything else

we keep everything else — identifiers, quoted literal strings, symbols/sigils, etc. all of it stays. untouched. protected. 💖

🌈 Pass 4: Re-assembly

lastly, we go back through the token list and re-assemble it all back into a single CSS string, which is then returned back to the caller. it left as one thing, it comes home as one thing. full circle moment. 😭

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🌸 AUTHOR 🌸

Graham TerMarsch (cpan@howlingfrog.com) — the icon, the legend, the one who wrote the XS. 👑

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💜 COPYRIGHT 💜

Copyright (C) 2007-, Graham TerMarsch. All Rights Reserved.

this is free software; you can redistribute it and/or modify it under the same license as Perl itself. share the wealth, bestie. 🎀

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⭐ SEE ALSO ⭐

• CSS::Minifier — the pure-Perl sibling. same job, slower walk, still valid. 🦋

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and that's the whole page, bestie. this was CSS::Minifier::XS(3), served up in perl v5.42.2, dated 2026-06-30. go forth and minify. no cap, periodt. 💅✨🫶