[whatwg] Link.onload; defer on style, depends

[Sean Hogan]

Ian Hickson wrote:
> On Wed, 25 Mar 2009, Sean Hogan wrote:
>   
>> Ian Hickson wrote:
>>     
>>> On Sun, 15 Mar 2009, Boris Zbarsky wrote:
>>>       
>>>> Sean Hogan wrote:
>>>>         
>>>>>> This is a request for the link element to be given an onload 
>>>>>> attribute.
>>>>>>             
>>>>> And presumably a readyState property.
>>>>>           
>>>> At least in Gecko, you can already detect whether the sheet is done 
>>>> loading: if you try to get its cssRules and that throws 
>>>> INVALID_ACCESS_ERR, then it's still loading.  (If it throws 
>>>> DOM_SECURITY_ERR then you're not allowed to read the style data; 
>>>> that's why you have to check for the exact type of exception thrown.  
>>>> Though really, if you're loading style sheets cross-site you're in 
>>>> for a world of hurt unless you control both sites.)
>>>>         
>>> I haven't added readyState at this time. I am concerned about feature 
>>> creep here.
>>>       
>> As for link.onload, link.readyState is implemented in IE since IE6. Same 
>> values as document.readyState, etc.
>>     
>
> Sure, but we only need one way to do this.
>
>   
How do I check if the resource is already loaded? In a cross-browser, 
cross-site manner?