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rel="compression-dictionary" HTML attribute valueThis feature is not Baseline because it does not work in some of the most widely-used browsers.
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Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The compression-dictionary keyword for the rel attribute of the <link> element is a link that browsers can use to download a compression dictionary that can be used to compress future downloads for resources on this site so the download sizes of those resources are smaller than standard compression.
Note: if the website has a Content-Security-Policy header, the connect-src directive (or default-src, if connect-src is not set) must permit the location of the dictionary resource to avoid the request being blocked.
See the Compression Dictionary Transport guide for more information.
| Specification |
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| Compression Dictionary Transport # the-compression-dictionary-link-relation-type |
This page was last modified on Apr 22, 2026 by MDN contributors.
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