I have emailed [1] Marco, Dave and Alex from the Moz acc team to see if 
they can help. Marco is already aware of the issue.

[1] http://lists.w3.org/Archives/Public/www-archive/2014May/0003.html

On Friday, 9 May 2014 19:26:57 UTC+1, Daniel Freedman wrote:
>
> It looks like any element with a mousedown handler is treated as a 
> clickable element in firefox: http://jsbin.com/vegan/1/quiet
>
> The example only has a div and mousedown handler, no bits of Polymer 
> anywhere.
>
> The Polymer gesture library adds mouse listeners so it doesn't have to 
> wrap addEventListener and keep track of interested elements. However, it 
> does not add a click event listener, and it seems odd to me that only 
> Firefox adds the click default action for this strategy. Chrome and IE both 
> give an accDefaultAction of none.
>
> Alice, Addy, this seems like a FF bug to me. Can one of you reach out to 
> their a11y team to figure out why they made this heuristic?
> On May 8, 2014 10:46 PM, "Steve Faulkner" <[email protected]<javascript:>> 
> wrote:
>
>>
>>
>> On Thursday, 8 May 2014 23:25:18 UTC+1, Daniel Freedman wrote:
>>>
>>> Hi Steve,
>>>
>>> Alice and Addy alerted me to this the other day, and I'm going to carve 
>>> out some time to work on this, probably tomorrow.
>>>
>>
>> great! thank you.
>>
>>  
>>
>>>
>>>
>>> On Thu, May 8, 2014 at 3:16 PM, Steve Faulkner <[email protected]>wrote:
>>>
>>>>  I have found that on non interactive polymer based custom elements, 
>>>> when using Firefox, a click handler is exposed via accessibility APIs. 
>>>> This 
>>>> causes assistive technology such as a screen reader to announce the custom 
>>>> element as clickable (when it isn't).
>>>>
>>>> Would appreciate some help tracking down the cause, as it is annoying 
>>>> to users <https://twitter.com/MarcoInEnglish/status/464383799640735745>
>>>> .
>>>>
>>>> custom element example where the issue occurs: https://github.com/
>>>> ThePacielloGroup/w3c-heading demo page http://thepaciellogroup.
>>>> github.io/w3c-heading/
>>>>
>>>>
>>>>
>>>>
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