1219825 - Combobox internal state is inconsistent when set via javascript

Status: RESOLVED WORKSFORME

(Core :: DOM: Core & HTML, defect)

Description

[jsproch]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36

Steps to reproduce:

Go to fiddle: https://jsfiddle.net/som2so5u/
Click reset
press tab to focus on the combobox
use arrow keys to select banana
use shift+tab to go back to the reset button
press spacebar to press the button and activate the hard reset
press tab to go back to the combobox
press down arrow


Actual results:

Combobox value went from "Apple" to "Candy" without passing through "Banana".

I also have unconfirmed (but believable) reports that prior to hitting the down arrow, screenreaders identify the combobox value as "Banana", despite the fact that it visually shows "Apple"


Expected results:

Combobox should go from Apple to Banana.

Comment 1

[jsproch]

Discovered in: https://github.com/facebook/react/issues/5315

Comment 2

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

Duplicate of bug 1203668?

Comment 3

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

Attachment: reduced testcase.html

Occurs on Nightly 44.0a1, Firefox 41.0.2 and 38.3.0esr.

Comment 4

[Boris Zbarsky [:bzbarsky]]

> Duplicate of bug 1203668?

No, since this testcase never sets .value.

Mats, you've looked into these bits before right?  Do you have time for this?

Comment 5

[Everett Zufelt]

I had originally filed this against React. Please let me know if there is any additional feedback that I can provide or testing that I can perform.

Comment 6

[Mats Palmgren (inactive)]

(In reply to Boris Zbarsky [:bz] from comment #4)
> Mats, you've looked into these bits before right?  Do you have time for this?

Yes.  No, not anytime soon, sorry.  Maybe in Q1.

Comment 7

[Boris Zbarsky [:bzbarsky]]

Just retested this, and the testcase works correctly now.