[whatwg] should async scripts block the document's load event?

Steve Souders whatwg at souders.org
Thu Feb 11 22:23:39 PST 2010

I just sent email last week proposing a POSTONLOAD attribute for scripts.


On 2/10/2010 5:18 PM, Jonas Sicking wrote:
> On Fri, Nov 6, 2009 at 4:22 PM, Brian Kuhn<bnkuhn at gmail.com>  wrote:
>> No one has any thoughts on this?
>> It seems to me that the purpose of async scripts is to get out of the way of
>> user-visible functionality.  Many sites currently attach user-visible
>> functionality to window.onload, so it would be great if async scripts at
>> least had a way to not block that event.  It would help minimize the affect
>> that secondary-functionality like ads and web analytics have on the user
>> experience.
>> -Brian
> I'm concerned that this is too big of a departure from how people are
> used to<script>s behaving.
> If we do want to do something like this, one possibility would be to
> create a generic attribute that can go on things like<img>,<link
> rel=stylesheet>,<script>  etc that make the resource not block the
> 'load' event.
> / Jonas

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