[transition] CR Request for Incremental Font Transfer - IFT

This is a transition request for a Candidate Recommendation
CR Request for Incremental Font Transfer - IFT
from https://github.com/w3c/transitions/issues/732

# Document title, URLs, estimated publication date

Incremental Font Transfer
https://www.w3.org/TR/2025/WD-IFT-20250715/ (latest WD)
https://w3c.github.io/IFT/Overview.html (as ED)
once approved

# Abstract

This specification defines a method to incrementally transfer a font from server to client. The client loads only the portion(s) of the font that they actually need, significantly reducing data transfer. Multiple incremental additions to the same font are possible, such as a user agent updating a font as a user browses multiple pages. Incremental transfer improves on unicode-range by avoiding damage to layout (kerning, ligatures, etc) rules, meaning it can efficiently support fine grained increments to latin and to complex scripts like Indic or Arabic.

# Status

https://www.w3.org/TR/2025/WD-IFT-20250715/#sotd

# Link to group's decision to request transition

> RESOLUTION: request a transition to CR after the working draft is published.
https://www.w3.org/2025/07/08-webfonts-minutes.html#12a3

# Changes

- WD to CR: removes an unused entry from the references
- WD changes are the result of responding to wide review

# Requirements satisfied

Meets requirements established in
  https://www.w3.org/TR/PFE-evaluation/

# Dependencies met (or not)

CSS Fonts 4 is a normative reference and is a (very mature, and widely implemented) WD.

# Wide Review

[Wide Review](https://github.com/w3c/IFT/issues/193)

# Issues addressed

[Issues](https://github.com/w3c/IFT/issues?q=is%3Aissue%20state%3Aclosed)

# Formal Objections

None

# Implementation

- [Fontations](https://github.com/googlefonts/fontations) is an open-source client implementation, written in Rust
- [IFT Encoder](https://github.com/w3c/ift-encoder) is a server-side or offline generator in C++, to produce the initial subset font files and the patches.

# Patent disclosures

[IPP](https://www.w3.org/groups/wg/webfonts/ipr/)


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Received on Thursday, 24 July 2025 20:09:24 UTC