24096 2013-12-14 08:53:55 +0000 Clarify element.dataset delete algorithm 2014-01-03 22:37:50 +0000 1 1 1 Unclassified WHATWG HTML unspecified All All RESOLVED FIXED P2 normal Unsorted 1 sof ian ian mike contributor oldest_to_newest 97617 0 sof 2013-12-14 08:53:55 +0000 Assuming element.setAttribute("data--n", "o") has been performed on an element, element.dataset will report [ ("N", "o") ] in its key-value list result. Per "The algorithm for deleting names", http://www.whatwg.org/specs/web-apps/current-work/#embedding-custom-non-visible-data-with-the-data-*-attributes 'delete element.dataset["N"]' will remove the "data--n" property. But so will 'delete element.dataset["-n"]'. It seems slightly odd to admit this second form also. Trident (IE11) implements this, others don't, ignoring the deletion. Should the delete steps have an extra step that corresponds to step 3 from the "setting" algorithm (but is non-throwing)? Or stay as-is as the current behaviour is intentional? If the latter, perhaps a note can be added to clarify that "deletion" does allow untranslated minus-lowercase pairs to pass through verbatim? 97710 1 contributor 2013-12-16 23:01:27 +0000 Checked in as WHATWG revision r8359. Check-in comment: Clarify that the delete dataset[foo] algorithm doesn't get invoked for values of 'foo' that don't exist. http://html5.org/tools/web-apps-tracker?from=8358&to=8359 97711 2 ian 2013-12-16 23:02:13 +0000 If I'm not mistaken, what's going on here is that IE11 has a WebIDL bug, and that the deleter algorithm in HTML won't get invoked unless the property name exists. 97728 3 sof 2013-12-17 07:16:45 +0000 That looks accurate, the "named property visibility algorithm" (a predicate) needs to pass before the deleter is applied. Thanks for the clarification, could the note be made a bit a stronger? ("can get" => "will only be".) 97985 4 contributor 2014-01-03 22:37:50 +0000 Checked in as WHATWG revision r8371. Check-in comment: Clarification regarding 'The algorithm for deleting names' for dataset. http://html5.org/tools/web-apps-tracker?from=8370&to=8371