rel="compression-dictionary

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The compression-dictionary keyword for the rel attribute of the {{HTMLElement("link")}} element is a link that browsers can use to download a {{glossary("Compression dictionary transport", "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 {{HTTPHeader("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.

Specifications

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Browser compatibility

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See also

• Compression Dictionary Transport guide