Thanks to everyone for your inputs. Brilliant. I apologise for a
badly-expressed statement re image sizes in html5.
The problem which I cannot seem to overcome (and this may well be simple
idiocy on my part) can be seen here! <http://www.pgsa-plus.co.uk/> The
page source will show you that the slideshow is currently controlled in
size by the width="50%" attribute in the <img> tag -
<img
src="http://farm6.static.flickr.com/5283/5688034076_7ef96aa9ee_b.jpg";
alt="pgs01" width="50%" />
This (along with all the other % values in the code) ensures that the
page displays correctly whichever display size the viewer is using.
Removing the % value from the width="50%" tag reverts the value to a
fixed width, which then automatically destroys the rest of the page
layout. Presumably the intention is that the % attribute is replaceable
by a CSS3 layout command, but I cannot find a way to make a CSS
structure to achieve this. Idiocy?
In the matter of the alt="pgs0x" attribute - Yes - a correction is required.
Regards to all
DMS
On 21/11/2011 11:03, T.J. Crowder wrote:
On 20 November 2011 13:55, David Swindlehurst <[email protected]
<mailto:[email protected]>> wrote:
Although there is a mass of insignificant discussion in the
current Specification about the "alt" tag, there is no mention of
image sizing at all...
Isn't there?
http://www.w3.org/TR/html5/the-map-element.html#attr-dim-width
Separately: Do you have a use-case for using percentage values for
`width` / `height` on `img` elements? I'm not immediately thinking of
one (well, not a good one), but that doesn't mean anything.
--
T.J. Crowder
Independent Software Engineer
tj / crowder software / com
www / crowder software / com
On 20 November 2011 13:55, David Swindlehurst <[email protected]
<mailto:[email protected]>> wrote:
Hi folks:
The W3C Validator for html5 (as with previous versions) accepts
element widths specified in percentages, through CSS, which
enables accurate page rendering for any size of display. EXCEPT
that it refuses to accept percentages for specifying width for the
img tag! For instance
<div class="?"><img src="image.png" alt="ancient grey-haired
awkward person" width="25%" /></div>
results in an error - the Validator expects an absolute number (of
pixels!). Fixing image width like this prevents correct rendering
of the page in any size of display different from the writer's
original. Although there is a mass of insignificant discussion in
the current Specification about the "alt" tag, there is no mention
of image sizing at all, which seems to me to be far more
important. Does the Spec need revising, or is the Validator wrong
in expecting an absolute number?
DMS
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