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Allow Internationalization Tag Set attribute in EPUB

spec: EPUB 3.4Impacting the support of EPUB 3.4Impacting the support of EPUB 3.4

status: ready for implemThe issue is ready to be implementedThe issue is ready to be implemented

type: specThe issue is related to a Specification updateThe issue is related to a Specification update

Status: Open.

#1616 In w3c/epubcheck;

· iherman opened on Jun 2, 2025

Adding AVIF to EPUB 3.4

spec: EPUB 3.4Impacting the support of EPUB 3.4Impacting the support of EPUB 3.4

status: ready for implemThe issue is ready to be implementedThe issue is ready to be implemented

type: specThe issue is related to a Specification updateThe issue is related to a Specification update

Status: Open.

#1642 In w3c/epubcheck;

· iherman opened on Oct 6, 2025

Newly deprecated features in epub 3.4

spec: EPUB 3.4Impacting the support of EPUB 3.4Impacting the support of EPUB 3.4

status: ready for implemThe issue is ready to be implementedThe issue is ready to be implemented

Status: Open.

#1649 In w3c/epubcheck;

· mattgarrish opened on Jan 2, 2026

Outdated features

spec: EPUB 3.4Impacting the support of EPUB 3.4Impacting the support of EPUB 3.4

status: acceptedReady to be further processedReady to be further processed

Status: Open.

#1650 In w3c/epubcheck;

· mattgarrish opened on Jan 2, 2026

Roll layouts

spec: EPUB 3.4Impacting the support of EPUB 3.4Impacting the support of EPUB 3.4

status: acceptedReady to be further processedReady to be further processed

Status: Open.

#1651 In w3c/epubcheck;

· mattgarrish opened on Jan 2, 2026

Reflowable documents cannot be designated in spreads

spec: EPUB 3.4Impacting the support of EPUB 3.4Impacting the support of EPUB 3.4

status: acceptedReady to be further processedReady to be further processed

Status: Open.

#1652 In w3c/epubcheck;

· mattgarrish opened on Jan 2, 2026

Allow pageBreakSource as an unprefixed meta property

spec: EPUB 3.4Impacting the support of EPUB 3.4Impacting the support of EPUB 3.4

status: acceptedReady to be further processedReady to be further processed

Status: Open.

#1653 In w3c/epubcheck;

· mattgarrish opened on Jan 2, 2026

Resources referenced from script element are exempt

spec: EPUB 3.4Impacting the support of EPUB 3.4Impacting the support of EPUB 3.4

status: acceptedReady to be further processedReady to be further processed

Status: Open.

#1654 In w3c/epubcheck;

· mattgarrish opened on Jan 2, 2026