.focus() results in 'Unspecified error.' IE9, v1.9

[Firsh]

When called on its own (not in a click handler or something like that), it returns this in IE9 (dev console). Tried with jQuery migrate, no joy.

min: LOG: JQMIGRATE: Logging is active SCRIPT16389: Unspecified error. jquery.min.js, line 2 character 7390

dev: LOG: JQMIGRATE: Logging is active SCRIPT16389: Unspecified error. jquery.js, line 3216 character 5

JSfiddle: ​http://jsbin.com/aloleq/2/edit Thought it was that I was using SIAF before the html elements are loaded (not sure where jsfiddle puts scripts), but it's not the case.

Interestingly it doesn't occur in the view mode of jsfiddle, only in the edit view (and in my plugin).

[Firsh]

It works when called with an 1ms setTimeout: ​http://jsbin.com/#/ogahac/1/edit

[dmethvin]

This is related to #13378, which only repros inside an iframe. Asking about document.activeElement seems to be grounds for the IE9 script death penalty while the page is loading.

Slightly modified test case: ​http://jsbin.com/aloleq/8/edit

Workaround, use native DOM .focus(): ​http://jsbin.com/aloleq/10/edit

[Firsh]

Replying to dmethvin:

Workaround, use native DOM .focus(): ​http://jsbin.com/aloleq/10/edit

The [0] workaround is king!

[Dave Methvin]

Fix #13393. Avoid IE9 activeElement of death.

Changeset: 85fc5878b3c6af73f42d61eedf73013e7faae408