W3C home > Mailing lists > Public > www-style@w3.org > August 2013

Re: [css-regions] Reworking getNamedFlows()

From: Mihai Maerean <mmaerean@adobe.com>
Date: Thu, 1 Aug 2013 18:27:01 +0100
To: François REMY <francois.remy.dev@outlook.com>, Catalin Grigoroscuta <cataling@adobe.com>, Mihnea-Vlad Ovidenie <mihnea@adobe.com>, Boris Zbarsky <bzbarsky@mit.edu>, "www-style@w3.org" <www-style@w3.org>
Message-ID: <CE20750F.EDAD%mmaerean@adobe.com>
On 8/1/13 7:18 PM, "François REMY" <francois.remy.dev@outlook.com> wrote:

>>>You may want to add listeners to a named flow before the page actually
>>>finished loading, and there's no good way to know when all the
>>>stylesheets have been downloaded and applied (you don't want to use the
>>>"load" event because it waits on images).
>>>
>>>Also, you may just want to listen to events on a flow that do not exist
>>>yet but you suspect some script or media query could make alive
>>>depending
>>>on conditions you don't want to know about (you just want to know when
>>>you should start acting on the flow).
>>>
>>
>> This is one way to do it, for the case where you know the name of the
>> named flow in advance.
>>
>> While this solves the theoretical problem, I don't know a real life use
>> case where this would be needed.
>> What would you do anyway with the NamedFlow object before the images are
>> loaded and the layout completed?
>
>Huh... maybe make sure that the website looks good even when the user is
>on 3G connection and that loading images takes a while? A good website
>does not rely on the images themselves to size the image exclusion areas,
>so there's no point waiting for them anyway.
>
>If the goal of the events is to make sure the regions are adjusted to fit
>content, you want to do so as soon as possible, even if you have to
>readjust later on.
>
>By the way, a lot of W3C tests use a <script> at the end of the page to
>interact with a NamedFlow, and I expect developers to do the same kind of
>things. There's a non-zero chance that the css stylesheets will all have
>been downloaded by the time the script is executed on most dev platforms,
>because css files are small and internet connections fast, so that will
>seem to work on the developer machine. However, it will not when the site
>runs in 3G because the CSS could load after the page finished parsing,
>causing any code that relies on the existence of a flow created by the
>stylesheet to fail to register any event on it because
>getNamedFlows()["the-flow"] will return undefined.
>
>If the web platform had a 'StyleReady' event you could hook up, you could
>still tell people to wait for this event before attempting to use any
>NamedFlow but this event does not exist so developers only have choice
>between DOMContentReady and Load; the first one is fast but doesn't
>guarantee all stylesheets have been applied, the second can be
>inacceptably delayed but gives you that guarantee. 		 	   		
>
Received on Thursday, 1 August 2013 17:27:37 UTC

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