focus() behaviour differs depending on how value is set

LayoutTests/editing/pasteboard/input-with-display-none-div.html

Index: LayoutTests/editing/pasteboard/input-with-display-none-div.html
diff --git a/LayoutTests/editing/pasteboard/input-with-display-none-div.html b/LayoutTests/editing/pasteboard/input-with-display-none-div.html
index a2b98fe26287d343f36e3cbb2704a57dc7435eaa..737b4d7142fe9f2c06d49be6bc301177237f4044 100644
--- a/LayoutTests/editing/pasteboard/input-with-display-none-div.html
+++ b/LayoutTests/editing/pasteboard/input-with-display-none-div.html
@@ -15,7 +15,7 @@ if (window.testRunner)
     testRunner.dumpAsText();
 
 var input = document.querySelector('input');
-input.focus();
+input.select();

[tkent, 2014/04/11 06:27:17]

Why does the test work?  We need focus() to make the InsertHTML command work.

[harpreet.sk, 2014/04/11 07:33:02]

Added focus().

[tkent, 2014/04/11 07:40:20]

What's the answer of the question?  Why it worked?
If select() is enough, we don't need to add focus() back.

[harpreet.sk, 2014/04/11 08:09:14]

For the given layout tests it worked because focus() was indirectly calling the
select() api which then select the text of input field. So even if we use
select() alone it will work .

[tkent, 2014/04/11 08:19:41]

I'm asking if execCommand('InsertHTML', ...) works with an INPUT with select()
without focus().

[harpreet.sk, 2014/04/11 08:37:56]

Yes it works without focus() and using select() alone. Even the copy() and
paste() commands are getting executed without focus() using select() alone.

[tkent, 2014/04/11 08:42:14]

Thanks.
Hmm, it sounds a bug.  Anyway, we may proceed as is.

 document.execCommand('InsertHTML', false, 'PASS');
 
 document.write(input.value);