On 14/07/2011 11:36, Foskett, Mike wrote:
Hi all,
Just finished a major update for Tesco's homepage.
http://www.tesco.com/
Tesco's are the UKs largest retailer and this page gets approximately
1 million hits a day.
The page has been speed tweaked as much as possible given IT / server
restraints.
Unfortunately the page now fails W3C formal grammar validation.
Because the page as designed was a massive 1.4MB (previously 260 Kb -
330 Kb), JavaScript was used to fetch image upon demand rather than
on-load or post-load.
This greatly reduced the impact on the servers (critical) and improved
the initial page load speed.
Obviously a no JavaScript version was also required.
The image references cannot be in the standard CSS as IE loaded all
the images, used or not:
.noJS .imgRef {background:url(...)}
Will not work.
All the image references were placed into a separate CSS noJS.css and
the link in a <noscript> and this is where the validation breaks.
Apparently <noscript> is illegal in the <head>, and a <noscript>
containing a <link> is illegal in the body.
<noscript>
<link rel="stylesheet" href="/homepages/default/noJS.compressed.css"
type="text/css" media="all" />
</noscript>
I went for placing it in the body so the noscript is legal but the
link reference is not.
I can see no alternative, and wondered if any of the list members had
a more valid solution?
Regards,
Mike Foskett
http://webSemantics.co.uk/ <http://websemantics.co.uk/>
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Failing that, could you not implement php to check whether there JS is
enabled, if not, it can echo the StyleSheet.
--
Mike Flanagan
CCO Telford Computer Doctor
http://www.telfordpc.co.uk
[email protected]
0800 058 8914
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