On May 13, 2012, at 4:20 PM, Kornel Lesiński <[email protected]> wrote:
> > Syntax used on the wiki: > http://wiki.whatwg.org/wiki/Adaptive_images > > places alt on the new element: > > <picture alt="alt"> > <source …> > <img> > </picture> > > > I think it can be improved in two ways: > > - Instead of having alt on <picture>, it could be on the fallback <img>. This > will give better backward-compatibility. Seems perfectly reasonable to me. I assumed an alt tag on both picture and the fallback, but this could serve to both cut down on redundancy for authors _and_ encourage authoring that’s equally accessible whether or not `picture` is supported. > > - Use of an attribute for alternative content is very limiting, e.g. image of > a comic cannot have dialog marked up well. Use of an non-empty element opens > up possibility of richer alternatives. I whole-heatedly agree. The primary objective is accessibility, for certain, but being able to serve tabular data as the fallback for a complex infographic stands to benefit _everyone_. I’d love to explore this further. > > > The processing rules for extracting fallback from <picture> would be: > > 1. Take all children of <picture> > 2. Remove/ignore all <source> elements. > 3. Interpret all <img alt=""> elements as their alt text. > > > <picture> > <source …> > <img alt="This is unstructured fallback"> > </picture> > > and > > <picture> > <source …> > <img> > This is <em>structured</em> fallback > </picture> > > The two examples above would have "This is unstructured fallback" and "This > is <em>structured</em> fallback" as their alt, respectively. > > > A use case for markup in alt: > > <picture> > <source src="world-map-showing-most-popular-browser-in-each-country.png"> > <table><tr><th>Country</th><th>Most popular browser</th>... > </picture> > > Trying to put all data in alt="" wouldn't work well, and > > <img alt="world map showing most popular browser in each country"> > > doesn't contain the information that the map conveys, so that's at best a > caption, not an alternative. > > -- > regards, Kornel Lesiński
