- From: David Swindlehurst <davidms@uwclub.net>
- Date: Mon, 21 Nov 2011 11:54:15 +0000
- To: "T.J. Crowder" <tj@crowdersoftware.com>
- CC: public-html-comments@w3.org, art@artspad.net, jukka.k.korpela@kolumbus.fi, simonp@opera.com, mike@w3.org
- Message-ID: <4ECA3BE7.6080501@uwclub.net>
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 <davidms@uwclub.net > <mailto:davidms@uwclub.net>> 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 <davidms@uwclub.net > <mailto:davidms@uwclub.net>> 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 > > >
Received on Monday, 21 November 2011 11:54:57 UTC