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RE: Make mouseenter/mouseleave behavior optional

From: Jacob Rossi <Jacob.Rossi@microsoft.com>
Date: Tue, 20 Nov 2012 23:57:14 +0000
To: Rick Byers <rbyers@google.com>, "olli@pettay.fi" <olli@pettay.fi>
CC: "public-pointer-events@w3.org" <public-pointer-events@w3.org>
Message-ID: <D0BC8E77E79D9846B61A2432D1BA4EAE13843EB2@TK5EX14MBXC288.redmond.corp.microsoft.com>
I agree that mouseenter/mouseleave should not be required if a UA doesn't implement them. In fact, neither should mousedown/mouseup/mousemove/mouseover/mouseout. I consider the section on mouse events purely for compat with legacy content. You could imagine a UA that doesn't have legacy content to deal with and just wants to implement pointer. Once we have an issue tracker, we should add this.

Though, for browsers, I agree with Olli:  mouseenter/mouseleave are great.  I'd like to discuss adding pointerenter/pointerleave as well (also should be added to issue tracker).  The primary reason these are good events is that they map to the CSS :hover state.

-Jacob

-----Original Message-----
From: Rick Byers [mailto:rbyers@google.com] 
Sent: Wednesday, November 21, 2012 5:40 AM
To: olli@pettay.fi
Cc: public-pointer-events@w3.org
Subject: Re: Make mouseenter/mouseleave behavior optional

On Tue, Nov 20, 2012 at 1:58 PM, Olli Pettay <Olli.Pettay@helsinki.fi> wrote:
> On 11/20/2012 08:23 PM, Rick Byers wrote:
>>
>> Hi,
>> In the compatibility with mouse events section [1], the pointer 
>> events draft dictates when mouseenter and mouseleave events should be 
>> dispatched.  However, I believe today only IE and Opera support these 
>> events [2].
>
> Only webkit does not support mouseenter and mouseleave, and IIRC

Ah yes, I see the quirksmode page is wrong - Firefox does too.

> there are some patches even for webkit to support them.
>
>
>  Can we add an 'if supported by the UA' to the wording to
>>
>> make it clear that some UAs won't dispatch these events?
>
> Why? mouseenter/leave are spec'ed elsewhere and implementations should 
> support them.
>

I guess it's not a big deal.  I just wouldn't want to imply that a complete implementation of pointer events MUST support mouseenter/mouseleave also - it would make it harder to get such an implementation into WebKit.

If mouseenter/mouseleave is really the right way forward, then I'd argue we should have pointerenter/pointerleave too.
Received on Tuesday, 20 November 2012 23:58:22 UTC

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