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[Bug 11295] Make script-inserted external scripts that have .async=false execute in the insertion order, default to true

From: <bugzilla@jessica.w3.org>
Date: Sat, 08 Jan 2011 06:34:40 +0000
To: public-html-bugzilla@w3.org
Message-Id: <E1PbSNs-0008B1-4z@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=11295

Will Alexander <serverherder+w3c@gmail.com> changed:

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                 CC|                            |serverherder+w3c@gmail.com

--- Comment #14 from Will Alexander <serverherder+w3c@gmail.com> 2011-01-08 06:34:39 UTC ---
Kyle mentioned t previously, but I wanted to also note:  The spec all ready
suggests (and IE implements) a solution to this problem -- begin loading the
url upon src assignment, wait until insertion to execute.  It's buried
somewhere in Step 12 IIRC. This provides a mechanism by which deferred
execution can be achieved.  Since Ordered execution is just a specific type of
dererral, it's handled as well.  We've had almost identical functionality using
images forever.

While it may seem to be, IEs readystate is *not* needed.  Notifcation in-flight
scripts have finished download, while nice, is not required.  Simply create the
scripts, assign the src, and use run-of-the-mill onload chaining.  Since order
will always be preserved, it degrades well in browsers that do not implement.

I dont think it should be feature-testable.  The browser vendor is presumably
aware of the spec's suggestion and chose not to heed.  Making it testable
encourages attempts to thwart the intended behavior. 

Wlile the symmetry is naturally appealing, I dont see how this async method can
be preferable.  A global queue is a natural bottleneck and it doesnt seem right
that my options are: 1) serially download or 2) introduce artificial
dependencies and risk significant delays.  Once "trusted" third-parties start
using this "feature," it's value erodes quickly.  I have struggled with FF's
current behavior and know others do to.  Would hate to end up back there when,
conceptually, there's an alternative.

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Received on Saturday, 8 January 2011 06:34:42 GMT

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