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longdesc attribute on img is not obsolete. http://www.w3.org/TR/html-longdesc/ Please correct this error. Thank you.
The error occurs in 3.6 Obsolete Attributes http://www.w3.org/TR/html5-diff/#obsolete-attributes
https://github.com/whatwg/html-differences/commit/fafe40ca874f680d6e4f7a23dd699a0c974c0148
https://github.com/whatwg/html-differences/commit/1e096e5472381729a0f8a052f72b62f991c4e657