RESOLVED DUPLICATE of bug 145460 158062
"use strict"; delete ProgressEvent.length; should not throw 
https://bugs.webkit.org/show_bug.cgi?id=158062
Summary "use strict"; delete ProgressEvent.length; should not throw
Simon Pieters (:zcorpan)
Reported 2016-05-25 02:39:59 PDT
See https://github.com/w3c/web-platform-tests/pull/3068 This fails in WebKit: <!DOCTYPE html> <script> "use strict"; try { delete ProgressEvent.length; w('PASS'); } catch(e) { w('FAIL'); } </script> http://software.hixie.ch/utilities/js/live-dom-viewer/saved/4231 Per ES6 deleting a function's "length" property should apparently not throw (even in strict mode). It throws in WebKit for a vanilla function: <!DOCTYPE html> <script> "use strict"; var x = function(x) {}; try { delete x.length; w('PASS'); } catch(e) { w('FAIL'); } </script> http://software.hixie.ch/utilities/js/live-dom-viewer/saved/4232 Also, the ProgressEvent interface object is typeof "object" in WebKit but per WebIDL should be "function". <!DOCTYPE html> <script> w(typeof ProgressEvent == "function" ? "PASS" : "FAIL"); </script> http://software.hixie.ch/utilities/js/live-dom-viewer/saved/4233
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Simon Pieters (:zcorpan)
Comment 1 2016-05-25 03:08:19 PDT
Or, this should be true: Object.getOwnPropertyDescriptor(function(){}, 'length').configurable It seems this bug is a dup of the following two bugs: https://bugs.webkit.org/show_bug.cgi?id=124598 https://bugs.webkit.org/show_bug.cgi?id=145460 *** This bug has been marked as a duplicate of bug 145460 ***
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