Optimize generated CSS by removing unused selectors #2008
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Hugo generates stats about the HTML elements, IDs and classes that can be found in the website, and we post-process the rendered CSS with postcss-purgecss that uses those stats to remove unused selectors. Signed-off-by: Kévin Commaille <[email protected]>
Signed-off-by: Kévin Commaille <[email protected]>
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This was done thanks to this Hugo guide.
The way this works is that Hugo generates stats about the HTML elements, IDs and classes that can be found in the website, and we post-process the generated CSS with PurgeCSS that uses those stats to remove unused selectors.
The generated file's size goes down from 403.8 Ko to 38.1 Ko (less than 10%!). Gzipped it goes down from 64.8 Ko to 8.7 Ko (less than 15%!). This huge gain is probably explained because Docsy includes the whole CSS from Bootstrap instead of only the parts that we need.
More than the gain in the download time of the file, we should gain performance in the parsing of the CSS.
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Preview: https://pr2008--matrix-spec-previews.netlify.app