[edit-context-property.tentative.html]
  [Check the existence of HTMLElement.editContext]
    expected: FAIL

  [HTMLElement.editContext must throw a TypeError if set to something other than an EditContext]
    expected: FAIL

  [HTMLElement.editContext can be set on the shadow root elements plus canvas.]
    expected: FAIL

  [Setting HTMLElement.editContext must throw a NotSupportedError for disallowed elements]
    expected: FAIL

  [An EditContext can only be associated with one element at a time]
    expected: FAIL