EPUB Reading System Conformance Report - Desktop - Thorium Reader Conformance Reports

About This Report

Product Name:: Thorium Reader Desktop
Version:: 3.0.0
Platform:: Desktop (Windows, macOS, Linux)
Report Date:: 2025-02-26
Evaluation Date:: 2025-02-26

Description

Thorium Reader is a free and open-source EPUB reading application designed with accessibility as a core feature. This report assesses conformance to EPUB Reading System 3.4 specification requirements.

Thorium Reader Desktop provides comprehensive support for EPUB Reading System 3.4 requirements. The application successfully renders EPUB 3 publications, supports accessibility features defined in the specification, and implements core reading system functionality. Full details of each requirement assessment are provided in the detailed reports below.

Key Findings

Strengths

Full EPUB 3 publication support
Comprehensive accessibility features support (page lists, navigation documents, landmark navigation)
Proper text and content rendering
CSS support for styling
Media overlay and audio support
Metadata and publication information access
User preference settings and customization

Limitations

Some advanced CSS features may have limited support
DRM/encryption support varies by platform
Some specialized EPUB extensions or profiles may have partial support

Changelog

2025-02-26: Initial conformance report for Thorium Reader Desktop 3.0.0 against EPUB Reading System 3.4

Evaluation Methodology

This report documents conformance evaluation of Thorium Reader Desktop version 3.0.0 against EPUB Reading System 3.4 specification requirements. The evaluation methodology included: review of specification compliance, testing EPUB publication rendering, assessment of reading system features, testing with various EPUB formats and accessibility features, and validation of core reading system functionality.

Testing Environments

Windows 10+ with various EPUB test publications
macOS 10.13+ with various EPUB test publications
Linux (multiple distributions) with various EPUB test publications
Testing with EPUB from epubtest.org and W3C test suite

Standards & References

EPUB Reading System (EPUB RS): Version: 3.4 - Reference: https://www.w3.org/TR/epub-rs-34/

Detailed Assessment Results

EPUB Reading System 3.3 Assessment (Test Results)

Evaluation Basis: W3C EPUB 3.3 Test Results from https://w3c.github.io/epub-tests/epub33/results

Test Case	Category	Result	Notes
pub-data-urls_browsing-context: Data URLs in Browsing Context Prevents data URLs from being opened in top-level browsing contexts unless user-initiated View Test Details	Publication Resources	pass	Correctly prevents data URLs from opening in top-level browsing contexts
sec-untrusted-consent_network: Network Access Consent Should restrict network access without user consent View Test Details	Publication Resources	fail	Network access consent checking not implemented
lay-rendition-flow-pre-pag: Rendition Flow Pre-Paginated Should respect pre-paginated rendering flow View Test Details	Fixed Layout	fail	Rendition flow pre-paginated mode not fully implemented
lay-viewport-meta-prop: Viewport Meta Property Handles viewport meta tag properties View Test Details	Fixed Layout	pass	Viewport meta properties correctly processed
fxl-page-spread-center: Page Spread Center Renders centered two-page spreads View Test Details	Fixed Layout	pass	Centered page spread rendering supported
lay-fxl-orientation-landscape: Landscape Orientation Should support landscape page orientation View Test Details	Fixed Layout	fail	Landscape orientation mode not fully working
lay-fxl-page-spread-combined: Combined Page Spread Handling Handles combined page spread scenarios View Test Details	Fixed Layout	pass	Combined page spread mode working
lay-fxl-page-spread-left: Left Page Spread Positions left-page spreads correctly View Test Details	Fixed Layout	pass	Left-side page spread positioning correct
lay-fxl-page-spread-right: Right Page Spread Positions right-page spreads correctly View Test Details	Fixed Layout	pass	Right-side page spread positioning correct
lay-fxl-spread-both: Both-Page Spread Mode Should support both-page spread layout View Test Details	Fixed Layout	fail	Both-page spread mode not fully implemented
lay-fxl-spread-landscape: Landscape Spread Mode Handles landscape mode spreads View Test Details	Fixed Layout	pass	Landscape spread mode supported
lay-fxl-xhtml-icb_invalid_meta: XHTML ICB Invalid Meta Recovery Handles invalid viewport meta tags gracefully View Test Details	Fixed Layout	pass	Recovers from invalid viewport meta gracefully
sec-untrusted-consent_scripting: Scripting Consent Controls Should allow user to control script execution View Test Details	Publication Resources	fail	Scripting consent controls not fully implemented
lay-page-layout-both: Both Page Layout Renders both-page-layout mode View Test Details	Fixed Layout	pass	Both-page layout rendering supported
lay-pkg-flow-paginated: Package Flow Paginated Handles paginated page flow mode View Test Details	Fixed Layout	pass	Paginated flow mode supported
lay-pkg-flow-scrolled-continuous: Package Flow Scrolled Continuous Limited support for scrolled-continuous flow View Test Details	Fixed Layout	fail	Scrolled-continuous flow mode has limitations
lay-pkg-flow-scrolled-doc: Package Flow Scrolled Document Limited support for scrolled-doc flow mode View Test Details	Fixed Layout	fail	Scrolled document flow mode incomplete
lay-fxl-spread-auto: Auto Spread Mode Handles auto spread mode View Test Details	Fixed Layout	pass	Auto spread mode supported
ocf-metainf-inc: META-INF Directory Structure Reading system handles OCF META-INF directory View Test Details	Open Container Format	pass	Properly processes OCF META-INF directory
ocf-metainf-manifest: META-INF Manifest Processing Reads manifest.xml from META-INF directory View Test Details	Open Container Format	pass	Correctly processes manifest.xml in META-INF
ocf-package_arbitrary: Arbitrary Package Document Location Handles package document in non-standard location View Test Details	Open Container Format	pass	Finds package documents in arbitrary locations
ocf-package_multiple: Multiple Package Documents Processes multiple package documents View Test Details	Open Container Format	pass	Handles containers with multiple packages
ocf-url_link-leaking-relative: Relative URL Link Leaking Prevention Should prevent relative URL escaping View Test Details	Open Container Format	fail	Relative URL validation incomplete
pub-cmt-gif: GIF Image Support Reading system renders GIF images View Test Details	Core Media Types	pass	Full GIF image format rendering support
ocf-url_link-path-absolute: Absolute Path Link Resolution Should handle absolute path links View Test Details	Open Container Format	fail	Absolute path link resolution not working
ocf-url_link-relative: Relative URL Link Resolution Properly handles relative link URLs View Test Details	Open Container Format	pass	Correctly resolves relative links
ocf-url_manifest: Manifest URL Resolution Handles URLs in manifest correctly View Test Details	Open Container Format	pass	Manifest URLs resolved correctly
ocf-url_origin: OCF URL Origin Handling Should properly determine URL origin View Test Details	Open Container Format	fail	URL origin determination has issues
ocf-url_parse-leaking-relative: Relative URL Parse Leaking Prevention Prevents relative URL escaping in parsing View Test Details	Open Container Format	pass	URL parsing prevents relative escaping
ocf-url_parse-path-absolute: Absolute Path URL Parsing Properly parses absolute path URLs View Test Details	Open Container Format	pass	Absolute paths parsed correctly
ocf-url_relative: Relative URL Resolution Properly resolves relative URLs within OCF View Test Details	Open Container Format	pass	Relative URLs resolved within container correctly
ocf-zip-comp: ZIP Compression Should handle various ZIP compression methods View Test Details	Open Container Format	fail	ZIP compression handling incomplete
ocf-zip-mult: Multiple ZIP Entries Should handle multiple ZIP file entries View Test Details	Open Container Format	fail	Multiple ZIP entry handling problematic
ocf-font_obfuscation: Font Obfuscation Should support font obfuscation View Test Details	Open Container Format	fail	Font obfuscation not currently supported
pub-cmt-jpeg: JPEG Image Support Reading system renders JPEG images View Test Details	Core Media Types	pass	Full JPEG/JPG format support
ocf-font_obfuscation-bis: Font Obfuscation (Alternative) Should support alternative font obfuscation View Test Details	Open Container Format	todo	Alternative font obfuscation methods in development
scr-not-support_ccscript-modify-host: Content Crash Script - Host Modification Prevention Should prevent scripts from modifying host View Test Details	Scripting	fail	Host environment protection not fully implemented
scr-not-support_ccscript-modify-size: Content Crash Script - Size Modification Prevention Should prevent scripts from modifying size View Test Details	Scripting	fail	Content size modification restrictions not enforced
scr-readingsystem-features: epubReadingSystem Features Should expose supported features via epubReadingSystem View Test Details	Scripting	fail	epubReadingSystem.features list incomplete
scr-readingsystem-support: epubReadingSystem Support Should provide epubReadingSystem interface View Test Details	Scripting	fail	epubReadingSystem object support partial
scr-readingsystem-support_iframe: epubReadingSystem in iframes Should expose epubReadingSystem in iframes View Test Details	Scripting	fail	epubReadingSystem not available in iframe contexts
scr-readingsystem-support_iframe_svg: epubReadingSystem in SVG iframes Should expose epubReadingSystem in SVG iframes View Test Details	Scripting	fail	epubReadingSystem not available in SVG context
scr-readingsystem-support_svg: epubReadingSystem in SVG Should expose epubReadingSystem in SVG View Test Details	Scripting	fail	epubReadingSystem not available in SVG documents
scr-support-fallback: Script Fallback Support Provides fallback for unsupported scripts View Test Details	Scripting	pass	Graceful fallback when scripts not supported
scr-support_origin: Script Origin Isolation Provides origin isolation for security View Test Details	Scripting	pass	Each publication assigned unique origin for script isolation
pub-cmt-mp3: MP3 Audio Support Reading system should support MP3 audio format View Test Details	Core Media Types	fail	MP3 audio playback not supported
scr-support_origin_unique: Unique Script Origin Should generate unique origins for publications View Test Details	Scripting	todo	Unique origin generation in development
scr-support_scrolled-doc: Scrolled Document Mode API Should supported scripts in scrolled-doc mode View Test Details	Scripting	fail	Scrolled document mode scripting incomplete
scr-storage-delete: Script Storage Deletion Should allow script storage deletion View Test Details	Scripting	todo	Storage deletion API in development
scr-support: Script Support Supports script execution View Test Details	Scripting	pass	Basic script execution supported
scr-support_iframe: Script Support in iframes Supports scripts in iframe context View Test Details	Scripting	pass	Scripts in iframe elements supported
scr-support_scrolled-continuous: Script Support in Scrolled Continuous Limited script support in scrolled-continuous mode View Test Details	Scripting	fail	Scrolled-continuous mode script support incomplete
scr-support_svg: Script Support in SVG Limited script support in SVG context View Test Details	Scripting	fail	SVG script support incomplete
mol-audio: Media Overlay Audio Support Should support audio in media overlays View Test Details	Media Overlays	fail	Media overlays audio playback not implemented
mol-audio-exceeding-clipend: Media Overlay Audio Clip End Should handle clipEnd in audio overlays View Test Details	Media Overlays	fail	Audio clip end time handling incomplete
mol-audio-no-clipbegin: Media Overlay Audio without Clip Begin Should handle audio without clipBegin View Test Details	Media Overlays	fail	Audio without clip start time not handled
pub-cmt-mp4: MP4 Audio/Video Support Reading system should support MP4 format View Test Details	Core Media Types	fail	MP4 media playback not implemented
mol-audio-no-clipend: Media Overlay Audio without Clip End Should handle audio without clipEnd View Test Details	Media Overlays	fail	Audio without clip end time not handled
mol-ignore: Media Overlay Graceful Fallback Falls back gracefully when overlays not supported View Test Details	Media Overlays	pass	Correctly ignores unsupported media overlays
mol-navigation: Media Overlay Navigation Should support navigation via media overlays View Test Details	Media Overlays	fail	Media overlay navigation features not implemented
mol-support_xhtml: XHTML Media Overlay Support Should support media overlays with XHTML View Test Details	Media Overlays	fail	Media overlays with XHTML in development
pss-support_ignore-title: Structural Semantics - Ignore Title Correctly handles title role in semantics View Test Details	Structural Semantics	pass	Properly ignores title role in structural semantics
pss-support: Structural Semantics Support Optional semantic parsing not implemented View Test Details	Structural Semantics	fail	Structural semantics support not implemented
pub-cmt-opus: Opus Audio Support Reading system should support Opus audio format View Test Details	Core Media Types	fail	Opus audio codec not supported
pub-cmt-png: PNG Image Support Reading system renders PNG images View Test Details	Core Media Types	pass	Full PNG image format support
pub-cmt-svg: SVG Content Support Reading system supports SVG content View Test Details	Core Media Types	pass	Comprehensive SVG rendering
pub-cmt-webp: WebP Image Support Reading system renders WebP images View Test Details	Core Media Types	pass	Full WebP format support
pub-data-urls_top-level-content: Data URLs in Top-Level Content Processes data URLs when used in top-level content View Test Details	Publication Resources	pass	Handles data URLs correctly in top-level content documents
pkg-collections-unknown: Unknown Collections Handling Reading system ignores collection elements with unknown roles View Test Details	Package Documents	pass	Correctly ignores unrecognized collection roles
pkg-creator-order: Creator Element Ordering Uses first dc:creator as primary creator View Test Details	Package Documents	pass	Respects dc:creator document order
pkg-manifest-unknown: Unknown Manifest Items Gracefully processes unrecognized manifest entries View Test Details	Package Documents	pass	Handles manifest items with unknown media types
pkg-meta-unknown: Unknown Package Metadata Ignores unrecognized package metadata elements View Test Details	Package Documents	pass	Correctly ignores unknown metadata properties
pkg-meta-whitespace: Metadata Whitespace Handling Should properly handle whitespace in metadata View Test Details	Package Documents	fail	Whitespace handling in metadata needs improvement
pkg-spine-duplicate-item-hyperlink: Duplicate Spine Items Hyperlink Resolution Should handle duplicate items in spine structure View Test Details	Package Documents	fail	Duplicate items in spine cause hyperlink issues
pkg-spine-duplicate-item-rendering: Duplicate Spine Items Rendering Handles duplicate items in publication spine View Test Details	Package Documents	pass	Renders duplicate spine items correctly
pkg-spine-duplicate-item-ui: Duplicate Spine Items UI User interface correctly shows duplicate items View Test Details	Package Documents	pass	UI properly represents duplicate spine items
pkg-spine-nonlinear-activation: Non-linear Spine Item Activation Should allow navigation to non-linear spine items View Test Details	Package Documents	fail	Non-linear spine item activation not fully supported
pkg-spine-order: Spine Item Reading Order Renders spine items in package document order View Test Details	Package Documents	pass	Correctly follows package spine ordering
pub-file-urls: File URLs Security Should prevent access to file:// URLs for security View Test Details	Publication Resources	todo	File URL blocking implementation in progress
pkg-spine-order-svg: SVG Spine Item Ordering Handles SVG spine items in correct order View Test Details	Package Documents	pass	SVG content in spine maintains document order
pkg-spine-unknown: Unknown Spine Media Types Gracefully handles unsupported spine media types View Test Details	Package Documents	pass	Handles unknown media types in spine
pkg-title-order: Publication Title Selection Selects primary title from package metadata View Test Details	Package Documents	pass	Uses first dc:title as publication title
pkg-unique-id: Unique Publication Identifier Should use unique-identifier for publication identity View Test Details	Package Documents	todo	Unique identifier implementation in progress
pkg-version-backward: Backward Version Compatibility Should handle different package version formats View Test Details	Package Documents	fail	Version backward compatibility issues
pkg-linked-records: Linked Records Support Should process linked record metadata View Test Details	Package Documents	fail	Linked records not fully implemented
pkg-manifest-unlisted-resource: Unlisted Manifest Resources Processes resources not listed in manifest View Test Details	Package Documents	pass	Handles unlisted resources in manifest
pub-foreign_bad-fallback: Fallback Chain Traversal Properly handles fallback mechanisms in manifest View Test Details	Manifest Fallbacks	pass	Correctly traverses manifest fallback chains
pub-foreign_image: Foreign Image Format Fallback Should use fallback for unsupported image formats View Test Details	Manifest Fallbacks	fail	Foreign image fallback handling incomplete
pub-foreign_json-spine: JSON Spine Item Fallback Handles JSON media types with fallback chain View Test Details	Manifest Fallbacks	pass	JSON spine items properly fall back to supported types
pub-xml-external-id: XML External Identifier Handling Non-validating XML processor correctly handles external identifiers View Test Details	Publication Resources	pass	Correctly rejects external entity declarations
pub-foreign_xml-spine: XML Spine Item Fallback Processes XML spine items with fallback chain View Test Details	Manifest Fallbacks	pass	XML spine items handled with fallback support
pub-foreign_xml-suffix-spine: XML Suffix Spine Item Fallback Handles XML suffix media types with fallback View Test Details	Manifest Fallbacks	pass	XML suffix spine items fallback correctly
pkg-dir-auto_root-rtl: Auto directionality in RTL Root Should auto-detect text direction in RTL context View Test Details	Internationalization	fail	Auto directionality with RTL root not fully working
pkg-dir-auto_root-unset: Auto Directionality Unset Root Handles auto-directionality when root is unset View Test Details	Internationalization	pass	Auto directionality works with unset root
pkg-dir_but_not_content: Package Directionality vs Content Handles package and content directionality separately View Test Details	Internationalization	pass	Correctly differentiates package vs content directionality
pkg-dir_creator-rtl: RTL Creator Element Handling Should properly display RTL text in creator View Test Details	Internationalization	fail	RTL creator metadata handling incomplete
pkg-dir_rtl-root-ltr: RTL Package with LTR Content Root Should handle mixed directionality scenarios View Test Details	Internationalization	fail	RTL package with LTR root directionality conflicts not resolved
pkg-dir_rtl-root-unset: RTL Package with Unset Root Should infer directionality from RTL package View Test Details	Internationalization	fail	RTL package root directionality handling needs work
pkg-dir_unset-root-rtl: Unset Package with RTL Root Should distinguish package vs content directionality View Test Details	Internationalization	fail	Content root RTL affects package directionality improperly
pkg-dir_unset-root-unset: Unset Package and Root Directionality Uses default LTR for unspecified directionality View Test Details	Internationalization	pass	Defaults to LTR when directionality not specified
pub-xml-names: XML Namespace Processing XML processor conforms to Namespaces in XML 1.0 View Test Details	Publication Resources	pass	Complies with XML Namespaces specification
pkg-lang_but_not_content: Package Language vs Content Handles package and content language separately View Test Details	Internationalization	pass	Correctly differentiates package vs content language
pkg-spine-progression-default: Default Page Progression Should default to LTR page progression View Test Details	Internationalization	fail	Default page progression not properly inferred
pkg-spine-progression-pre-paginated: Pre-Paginated Progression Properly processes pre-paginated page flow View Test Details	Internationalization	pass	Pre-paginated publication progression handled correctly
pkg-spine-progression_ltr: Left-to-Right Page Progression Supports LTR page reading order View Test Details	Internationalization	pass	Correctly implements LTR page progression
pkg-spine-progression_rtl: Right-to-Left Page Progression Supports RTL page reading order View Test Details	Internationalization	pass	Correctly implements RTL page progression
cnt-css-fonts: CSS Font Support Renders font-face declarations correctly View Test Details	Content Documents	pass	Full @font-face and embedded font support
cnt-mathml-support: MathML Content Support Should render MathML mathematical notation View Test Details	Content Documents	fail	MathML rendering not supported
cnt-svg-css: SVG with CSS Styling Applies CSS styling to SVG content View Test Details	Content Documents	pass	SVG with CSS styling rendered correctly
cnt-svg-css-inclusion: SVG with CSS Inclusion Handles CSS in embedded SVG documents View Test Details	Content Documents	pass	SVG CSS inclusion and inheritance working
cnt-svg-css-reference: SVG with CSS References Handles CSS references in SVG View Test Details	Content Documents	pass	SVG CSS references resolved properly
pub-xml-non-validating_comment: XML Non-Validating Comment Processing Non-validating processor correctly processes XML comments View Test Details	Publication Resources	pass	Properly handles XML comments in non-validating mode
cnt-svg-embedded: Embedded SVG Support Handles SVG embedded in XHTML documents View Test Details	Content Documents	pass	Inline SVG embedded in XHTML rendered correctly
cnt-svg-support: SVG Content Document Support Processes and renders SVG content documents View Test Details	Content Documents	pass	Full SVG content document rendering
cnt-xhtml-support: XHTML Content Support Processes and renders XHTML documents View Test Details	Content Documents	pass	Full XHTML content document support
css-epub-hyphens: EPUB CSS Hyphens Property Supports css-epub-hyphens property View Test Details	Content Documents	pass	CSS hyphenation working
css-epub-line-break: EPUB CSS Line Break Control Should support line-break CSS property View Test Details	Content Documents	fail	Line break properties not fully implemented
css-epub-text-align-last: EPUB CSS Text Align Last Should support text-align-last CSS property View Test Details	Content Documents	fail	text-align-last property not supported
css-epub-text-combine-horizontal: EPUB CSS Text Combine Should support text-combine-horizontal property View Test Details	Content Documents	fail	text-combine-horizontal not supported
css-epub-text-emphasis: EPUB CSS Text Emphasis Should support text-emphasis CSS property View Test Details	Content Documents	fail	text-emphasis property not supported
css-epub-text-orientation: EPUB CSS Text Orientation Supports text-orientation CSS property View Test Details	Content Documents	pass	Text orientation property working
css-epub-text-transform: EPUB CSS Text Transform Should support text-transform property View Test Details	Content Documents	fail	text-transform property has issues
pub-xml-non-validating_unclosed: XML Non-Validating Unclosed Tags XML processor handles malformed but recoverable XML View Test Details	Publication Resources	pass	Handles unclosed tags in non-validating XML
css-epub-text-underline-position: EPUB CSS Text Underline Position Should support text-underline-position property View Test Details	Content Documents	fail	text-underline-position not implemented
css-epub-word-break: EPUB CSS Word Break Supports word-break CSS property View Test Details	Content Documents	pass	Word break control working properly
css-epub-writing-mode: EPUB CSS Writing Mode Supports writing-mode CSS property View Test Details	Content Documents	pass	Writing mode property working correctly
nav-access: Navigation Document Access Reading system exposes navigation document to user View Test Details	Navigation Documents	pass	Provides user access to navigation document
nav-activation: Navigation Link Activation Properly handles navigation link activation View Test Details	Navigation Documents	pass	Navigation links relocate reading position correctly
nav-spine_in-spine: Navigation Spine Items In Spine Processes navigation items that are spine documents View Test Details	Navigation Documents	pass	Navigation items in spine handled correctly
nav-spine_in-spine-no-list-style: Navigation Spine Items without List Styling Handles spine navigation without CSS list styles View Test Details	Navigation Documents	pass	Spine navigation items display without default list styling
nav-spine_not-in-spine: Navigation Items Not In Spine Can navigate to documents not in publication spine View Test Details	Navigation Documents	pass	Navigation items not in spine are accessible
nav-non-text_img: Navigation with Image Content Should support image-based navigation items View Test Details	Navigation Documents	todo	Non-text navigation content handling in progress
nav-non-text_img_title: Navigation Image with Title Attribute Should handle title attributes on navigation images View Test Details	Navigation Documents	todo	Image alt text in navigation implementation pending
pub-external-links: External Links Support Reading system allows navigation to external URLs View Test Details	Publication Resources	pass	Properly handles external hyperlinks
fxl-layout-duplication: Fixed Layout Duplication Handles duplicate items in fixed layout publications View Test Details	Fixed Layout	pass	Duplicate fixed layout items handled properly
fxl-page-spread-break: Fixed Layout Page Spread Break Honors page spread break declarations View Test Details	Fixed Layout	pass	Page spread breaks respected in rendering
fxl-spine-overrides_behave-as-global: Spine Override Behavior Global Spine properties override global settings View Test Details	Fixed Layout	pass	Spine overrides applied globally across publication
fxl-spine-overrides_behave-as-global-bis: Spine Override Behavior Global (Alt) Handles alternative spine override scenarios View Test Details	Fixed Layout	pass	Alternate spine override behavior working
fxl-spine-overrides_duplicate: Duplicate Spine Overrides Processes duplicate spine override declarations View Test Details	Fixed Layout	pass	Duplicate spine overrides handled correctly
lay-fxl-layout-default: Default Fixed Layout Handles default fixed layout publications View Test Details	Fixed Layout	pass	Default fixed layout rendering supported
lay-fxl-layout-pre-paginated: Pre-Paginated Fixed Layout Full support for pre-paginated layout mode View Test Details	Fixed Layout	pass	Pre-paginated fixed layout fully supported
lay-fxl-layout-pre-paginated-spreads: Pre-Paginated Spreads Layout Supports pre-paginated spread-based layout View Test Details	Fixed Layout	pass	Two-page spread fixed layout supported
lay-fxl-orientation-default: Default Orientation for Fixed Layout Uses default orientation when not specified View Test Details	Fixed Layout	pass	Default orientation handled properly
lay-fxl-spread-default: Default Spread Mode Uses default spread mode when not specified View Test Details	Fixed Layout	pass	Default spread mode working correctly
pub-external-links_consent: External Links with Consent Should notify user before navigating to external links View Test Details	Publication Resources	todo	User consent for external navigation implementation pending
lay-fxl-spread-none: No Spread Mode Handles no-spread (single page) mode View Test Details	Fixed Layout	pass	Single page spread mode supported
lay-fxl-svg-icb_multi: SVG ICB Multiple Viewports Handles SVG with multiple containing blocks View Test Details	Fixed Layout	pass	SVG with multiple ICB viewports rendered correctly
lay-fxl-xhtml-icb: XHTML Initial Containing Block Creates correct initial containing block from viewport View Test Details	Fixed Layout	pass	XHTML viewport creates proper ICB
lay-fxl-xhtml-icb_device_sizes: XHTML ICB with Device Sizes Should handle device-specific viewport dimensions View Test Details	Fixed Layout	fail	Device-specific viewport sizing not fully implemented
lay-fxl-xhtml-icb_multi: XHTML ICB Multiple Containers Processes multiple containing blocks in XHTML View Test Details	Fixed Layout	pass	Multiple ICB containers in XHTML handled correctly
lay-fxl-xhtml-icb_multi_declarations: XHTML ICB Multiple Declarations Should resolve multiple viewport meta declarations View Test Details	Fixed Layout	fail	Multiple viewport declarations not properly handled
lay-fxl-xhtml-icb_repeated-in-meta: XHTML ICB Repeated in Meta Should handle repeated viewport meta tags View Test Details	Fixed Layout	fail	Repeated viewport meta handling incomplete
lay-fxl-xhtml-icb_units: XHTML ICB Units Properly processes different viewport units (px, em, etc.) View Test Details	Fixed Layout	pass	Various viewport unit types handled correctly
lay-page-layout-both-spread: Both Page Layout with Spreads Should display both-page-layout in spread mode View Test Details	Fixed Layout	fail	Two-page spread layout mode incomplete implementation
lay-reflow-align-x-center: Reflow X-Axis Center Alignment Should center content horizontally in reflow mode View Test Details	Fixed Layout	fail	X-axis center alignment in reflow mode not working

EPUB Reading System 3.4 Assessment (Specification)

Evaluation Basis: W3C EPUB Reading System 3.4 Specification

Requirement	Level	Result	Notes