Validation date: 2026-09-17
Validator: EPUBCheck 5.4.0
Runtime: eclipse-temurin:21-jre Docker image

Command:
docker run --rm -v "$PWD:/work" -w /work eclipse-temurin:21-jre java -jar epubcheck-5.4.0/epubcheck.jar four-chapter-web-novel-fixture.epub

Output:
Validating using EPUB version 3.4 rules.
No errors or warnings detected.
Messages: 0 fatals / 0 errors / 0 warnings / 0 infos

This result establishes only that this exact fixture produced no messages from EPUBCheck 5.4.0 under the selected rules. It does not establish translation quality, accessibility conformance, retailer acceptance, or cross-device compatibility.