Bugzilla – Bug 843
introduce <object type='' data='' typemustmatch>
Last modified: 2015-02-20 10:23:39 CET
http://dev.w3.org/html5/spec/the-iframe-element.html#attr-object-typemustmatch [[ The typemustmatch attribute is a boolean attribute whose precense indicates that the resource specified by the data attribute is only to be used if the value of the type attribute and the Content-Type of the aforementioned resource match. The typemustmatch attribute must not be specified unless both the data attribute and the type attribute are present. ]]
*** Bug 910 has been marked as a duplicate of this bug. ***
https://github.com/validator/validator/commit/a7a66bc83fbddd6d7a86b9eb77a93610eb9f590f