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CSS Optimization: Is Using Declarations Just Once (UDJO) Still Effective Today? · Jens Oliver Meiert
The technique is to use:
.example,
.sample {
display: flex;
}instead of
.example {
display: flex;
}
.sample {
display: flex;
}Gaining 1-3% on the bundle size is few IMHO. The tool to make it happen is available at https://github.com/j9t/css-dedup
