[webkit-dev] The SrcN responsive images proposal

Maciej Stachowiak mjs at apple.com
Thu Oct 24 10:06:04 PDT 2013

On Oct 23, 2013, at 11:24 PM, Yoav Weiss <yoav at yoav.ws> wrote:

> On Wed, Oct 23, 2013 at 10:22 PM, Ryosuke Niwa <rniwa at webkit.org> wrote:
> On Tue, Oct 22, 2013 at 1:50 PM, Tab Atkins Jr. <jackalmage at gmail.com> wrote:
> On Sun, Oct 20, 2013 at 10:07 AM, Antti Koivisto <koivisto at iki.fi> wrote:
> > Ignoring other aspects of this, the idea of making attribute name an
> > enumeration is somewhat distasteful. It will require ugly special parsing.
> > The platform has plenty of attribute values that are lists already.
> The parsing aspect isn't particularly new - parsing data-* attributes
> presents the same problem.  You just need to filter the list of
> attributes on the element to look for things with a src- prefix.  I've
> heard direct feedback from Yoav, implementing in Blink, that it's not
> a big problem.
> Just because it was not a big problem in one engine, it doesn't mean it won't be in other engines.
> If we're supporting src-N attributes in WebKit, I'd like to see N to have a small upper bound; e.g. 10.
> so that we can enumerate all parsed attributes statically at the compilation time.
> Out of curiosity, what would be the benefits of such a restriction? 
> When thinking about the feature's implementation for Blink, I found it easier to iterate once over the element's attribute, create a vector containing all the srcN attributes (so all attrs that start with "src-"), sort it according to attribute numeric order, and return that vector when the srcN attributes are requested from the element.

Your described strategy is both not quite correct (srcN attributes are not all attributes that start with "src-") and it's O(N^2) for srcN attributes added dynamically with script. It's likely not the best way to implement the feature.

I think the authoring complexity is a more relevant consideration than the implementation complexity, though.


> For the HTMLPreloadScanner, I'd probably need to create a similar vector attribute by attribute, sort it at the tag's end, and send it to the main thread.
> Wouldn't a similar approach work for WebKit?
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