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The conformance checker for EPUB publications

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Let me describe what I did to explain the "problem": Sometimes changes have to be done in an epub-file. So I take the epub-file and unzip it to a folder...

status: needs review

Hi, I've seen #1283 and #1549, and I want to report a related issue. Links on the different pages, in the body text (e.g. the link to the Java library...

I receive the following error on my EPUB 2 ebook: `Col: 73: ERROR(RSC-005): Error while parsing file: attribute "value" not allowed here; expected attribute "dir", "id", "style", "title" or "xml:lang"`...

- This fixes a high severity vulnerability in `org.codehaus.jackson:jackson-mapper-asl:1.9.12` (CVE-2019-10172). - It also fixes a high severity vulnerability in `org.codehaus.jackson:jackson-core-asl:1.9.12` (CVE-2019-10202).

When following the WAI ARIA 1.2 example for using `role="math"` on an image element to indicate that it represents a mathematical expression (https://www.w3.org/TR/wai-aria-1.2/#example-8), EPUBCheck reports an ERROR RSC-005 stating that...

In the old epub 2.0.1 spec there existed a clear reasoned specification for the Unicode Normalization Form C to be used for all XHtml content files. [QUOTE] 1.3.6: Relationship to...

when I open most of mine epub files (except one epub file can open normally) it gives message "File mode specification error: (wrong-type-argument listp \357\273\277)",and nomatter I set my coding-system...

Currently, building the epubcheck Docker (Docker server version: 27.0.3, API version: 1.46) image produces a [warning](https://docs.docker.com/reference/build-checks/from-as-casing/): > WARN: FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 2)

`actions/checkout@v2` and `actions/cache@v2` currently issue deprecation warnings during execution about deprecated Node.js version. > The following actions uses node12 which is deprecated and will be forced to run on node16:...