[Webkit-unassigned] [Bug 158062] New: "use strict"; delete ProgressEvent.length; should not throw

Wed May 25 02:39:59 PDT 2016

https://bugs.webkit.org/show_bug.cgi?id=158062

            Bug ID: 158062
           Summary: "use strict"; delete ProgressEvent.length; should not
                    throw
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zcorpan at gmail.com

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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