Chrome 55.0.2859.0
OSX 10.11.6

What steps will reproduce the problem?
1. Open `queryCommandEnabled.html` and open the console.
2. Click the button.
3. Highlight the text and click the button.

What is the expected output?
document.queryCommandEnabled('copy') logs `true` in both cases.

What is the expected output?
2. `false`
3. `true`

This one's a bit weird.
Firefox: 2. true 3. true
Chrome, Opera: 2. fase 3. true
Safari: 2. false 3. false [1]
Firefox matches the expected behaviours.

Reading [2] from the perspective of a normal developer suggests the correct value should be `true`, but the specification draft link on that page is broken, and following a link to [3] leads to a spec with an aggressive warning that it will not advance beyond draft status. ¯\_(ツ)_/¯

All the more reason to implement a sane clipboard API ( Issue 593475 ).

queryCommandEnabled.html source:

  Some text
  <button onclick="console.log(document.queryCommandEnabled('copy'));">Click me</button>

[1] https://bugs.webkit.org/show_bug.cgi?id=156529
[2] https://developer.mozilla.org/en-US/docs/Web/API/Document/queryCommandEnabled
[3] https://w3c.github.io/editing/execCommand.html