There is a new EPUBCheck preview. Version v5.0.0-beta-1 is available from
https://github.com/w3c/epubcheck/releases
Quote:
Features- allow SVG/MathML doctype declarations (6e44b39), closes #1192 #1114
- allow any file extension (bdee846)
- check discouraged HTML elements (base, rp, embed) (afb28cb), closes #1271
- check Media Overlays total duration consistency (ee9c720), closes #1217
- check that 'page-list' and 'landmarks' nav are flat lists (15825a5), closes #1279
- check that publication resources are not in META-INF (61dbf53), closes #1227
- HTML link element resources do not require fallbacks (8d77b0f), closes #1247
- ignore Nav Doc nav elements with no epub:type (f989588), closes #1222
- loosen restriction on where remote resources can be referenced (73fe57c), closes #1288
- page-list nav does not have to match reading order (d0f12a9), closes #1237
- report reserved string in XHTML custom attribute namespaces (bc86db8), closes #1190
- restrict obfuscation to font core media types (a229edf), closes #1291
Minor Changes- remove "under review" notice for toc nav ordering warning (fe08c59), closes #1194
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