When comparing CSS-On-Diet vs Pleeease, the Slant community recommends Pleeease for most people. In the question“What are the best CSS preprocessors/postprocessors?” Pleeease is ranked 12th while CSS-On-Diet is ranked 15th. The most important reason people chose Pleeease is:
preprocess CSS (experimental) adds prefixes, based on Autoprefixer provides fallbacks for rem unit, CSS3 pseudo-elements notation adds opacity filter for IE8 converts CSS shorthand filters to SVG equivalent packs same media-query in one @media rule inlines @import styles minifies the result generates sourcemaps from pre- to postprocessors
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Pros
Pro Fast to read and write CSS
Works like Emmet, shorting CSS keywords, but it's not limited only to writing. Also modifying and reading COD(CSS-On-Diet) files is faster.
Pro Easy to learn and use
Doesn't require programming skill to work with variables, mixins, media breakpoints
Pro All-in-one post processor
preprocess CSS (experimental)
adds prefixes, based on Autoprefixer
provides fallbacks for rem unit, CSS3 pseudo-elements notation
adds opacity filter for IE8
converts CSS shorthand filters to SVG equivalent
packs same media-query in one @media rule
inlines @import styles
minifies the result
generates sourcemaps from pre- to postprocessors
Pro Combines media queries into single rules
If you have repeated media queries in your stylesheet, Pleeease will pack them into a single media query when compiled.
Pro Rem fallback
Rem unites are not supported in IE8 and below, so Pleeease provides a pixel fallback.
Pro Uses Autoprefixer
Pleeease uses Autoprefixer to add vendor prefixes based on which browsers you want to support (prefixes are added based on information from caniuse.com.
Cons
Con It's difficult adjusting to different keywords
The keywords are shortened to 3 letters. For example, "background-color" becomes "bac" and "max-width" becomes "maw". These keywords are far less intuitive than their original form and make the CSS much less readable for those who don't know CSS-On-Diet.
Con Extremely limited adoption
CSS-On-Diet has just 7 stars on Github and a very small adoption rate. For an open source project this usually means less bugs reported, lesser documentation and few third-party learning resources.
Con Not very popular
Pleeease is not very popular. This may make finding guides, tutorials or resources outside the official ones difficult.