MWTidy::checkErrors() and its callee TidyDriverBase::validate() are removed, as are
MediaWikiTestCase::assertValidHtmlSnippet() and ::assertValidHtmlDocument(). The
$wgValidateAllHtml configuration option is removed and will be ignored.
+* Execution of external programs using MediaWiki\Shell\Command now applies RESTRICT_DEFAULT
+ Firejail restriction by default.
+* The ResourceLoaderModule::getHashMtime() and ::getDefinitionMtime() methods,
+ deprecated in 1.26, were removed.
=== Deprecations in 1.31 ===
* The Revision class was deprecated in favor of RevisionStore, BlobStore, and