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After adding a custom attribute1, the HTML editor will not complain this is an invalid attribute. It works but any invalid attribute2 followed by this custom attribute1 became valid too! I mean the editor has no complain on this attribute2. e.g. <div att1="dkdk" att2="888"></div> att1 is added to the json file as a custom attribute. But att2 has not added as a custom attribute. HTML editor should show the att2 is invalid, but actually it is not.