[webkit-dev] ASYNC attribute for <script>?
ian at hixie.ch
Tue Apr 28 11:48:21 PDT 2009
On Tue, 28 Apr 2009, Peter Kasting wrote:
> It's great that WebKit has parallel script **downloading**. But... this
> still blocks page rendering of all elements below the script and still
> I'd like an ASYNC attribute to the SCRIPT tag that implied WebKit should
> go ahead and render subsequent page elements and go ahead executing
> standalone features (carousel, widgets, etc.) to get better page
> This is esp. important for ads. It's unlikely that we can make much
> progress amongst ad services to adopt performance improvements that
> require even a small amount of extra JS coding. It is more likely that
> we could make inroads in getting them to add a simple "async" attribute.
> The key to accomplish this is that the async-loaded scripts must be able
> to preserve document.write. This opens up a lot of scenarios - I
> certainly haven't thought them all through. But Opera has this
> capability, and in my testing it works (see
HTML5 has <script async> but it doesn't preserve document.write()
behaviour. I don't understand how that is possible given that a
document.write() could change the meaning of subsequent tokens, but that
processing subsequent tokens can have side-effects.
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
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