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Re: [whatwg] responsive images

From: wrong string <kornel@geekhood.net>
Date: Tue, 22 May 2012 09:26:17 -0500
Message-Id: <8C9FC80F-0DA2-477F-842A-D138BF9BFBD1@geekhood.net>
To: Paul Court <paul@pmcnetworks.co.uk>
Cc: whatwg@whatwg.org
On 22 maj 2012, at 05:53, Paul Court <paul@pmcnetworks.co.uk> wrote:

> As a HTML author and programmer, I just cannot see myself implementing the current srcset proposal on sites. As a programmer, it has very much got what we would call a "bad code smell".
> <img src="face-600-200@1.jpeg" alt="" srcset="face-600-200@1.jpeg 600w 200h 1x, face-600-200@2.jpeg 600w 200h 2x, face-icon.png 200w 200h">
> Not to mention, what happens when a 3x device is released?

2x image will be used, upscaled. 

I think that 3x device is very very unlikely to ever happen, since 2x screens are may be dense enough to have pixels smaller than human eye can see.

> 1x and 2x are. Is it 2x 72 or 2x 96? 
> and isn't 600-200@2 just the same as 1200-400@1?

'x' is not a media query, but property of the image. 

600@2 is a higher quality version of 300@1. 

> Perhaps something like this:-
> <picture>
>    <src="some.img?{width}-{height}@{dpi}">
>    <img src="some-fallback.img">
> </picture>
> You could then define a list of parameters that the browser supports as replacements. Eg. viewport-width/height, dpi, density. This could also be carried over to other tags.

If width/height is a virwport size then it will generate lots of unique URLs (requires server to generate many images and proxies to cache them separately), and may generate lots of requests when window is resized. 

It doesn't work with static file servers, and may be costly/problematic for CDNs. 

Another risk is that authors will create files only for size/DPI of iPhone and iPad and never supply images for 3000 other resolutions of various Android devices. 

regards, Kornel
Received on Tuesday, 22 May 2012 14:27:53 UTC

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