Re: [csswg-drafts] [css-fonts-5] @font-face supports incremental (#6063)

I agree that "FallbackURLForBrowsersWhichDontSupportIncrementalLoading.otf" should be "FallbackURLForBrowsersWhichDontSupportIncrementalLoading.woff2"

It isn't so simple for the Range Request method, because calculating byte ranges into a WOFF2 compressed stream is harder than calculating them into the uncompressed font.

The Patch Subset method uses the same [Brotli](https://tools.ietf.org/html/rfc7932) compression as WOFF2 for the initial delivery, and then [Brotli Patch Mode](https://lists.w3.org/Archives/Public/public-webfonts-wg/2018Aug/0000.html)to compress the patches, re-using the compression dictionary from the initial download.

You can see a [demo here](https://fonts.gstatic.com/experimental/incxfer_demo).

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Received on Monday, 8 March 2021 19:39:08 UTC