26265 2014-07-04 09:05:03 +0000 Typo: unregister*Handler() does not return any value. 2014-07-30 22:14:38 +0000 1 1 1 Unclassified WHATWG HTML unspecified PC All RESOLVED FIXED P2 normal Unsorted 1 sanjoy.pal ian ian mike contributor oldest_to_newest 108718 0 sanjoy.pal 2014-07-04 09:05:03 +0000 Here http://www.whatwg.org/specs/web-apps/current-work/#custom-handlers As per the idl definition, unregisterProtocolHandler() does not return any value. Below, the spec specifies that it return state which need to be corrected. state = window . navigator . unregisterProtocolHandler(scheme, url) state = window . navigator . unregisterContentHandler(mimeType, url) 109615 1 ian 2014-07-30 22:14:38 +0000 This will be fixed in the next update. Thanks!