LayoutTests/imported/w3c/web-platform-tests/dom/collections/HTMLCollection-delete-expected.txt

PASS Loose id 
FAIL Strict id assert_throws: function "function () {
    "use strict";
    delete c[0];
  }" did not throw
PASS Loose name 
FAIL Strict name assert_throws: function "function () {
    "use strict";
    delete c.foo;
  }" did not throw