W3C home > Mailing lists > Public > public-respimg@w3.org > March 2015

Re: accessibility and browser zoom

From: Attiks <attiks@gmail.com>
Date: Sun, 01 Mar 2015 10:36:57 +0000
Message-ID: <CAM7OHzvww-FJQ3vLRvH03nFSzG7XRHbJG=EPrZvT=XHQ0+kTkw@mail.gmail.com>
To: Alice Wonder <alice@domblogger.net>
Cc: public-respimg@w3.org
But you can translate the px values to ems,  just divide by 16 and it
should work.  We always use ems for sizes, except the last/widest one we
use px so it works well on huge screens

On Sun, Mar 1, 2015, 11:32 Alice Wonder <alice@domblogger.net> wrote:

> It may be, but when generating picture code from a database, I don't
> know if the image is going to use 35% of the container it is in or 100%
> of the container it is in. That's determined by an external CSS sheet.
>
> On 03/01/2015 02:23 AM, Attiks wrote:
> > Isn't is safer to use em based media queries, those should scale
> correctly
> >
> > On Sun, Mar 1, 2015 at 10:40 AM, Alice Wonder <alice@domblogger.net
> > <mailto:alice@domblogger.net>> wrote:
> >
> >     I can't test Safari.
> >
> >     It does the same thing in Chrome.
> >
> >     The media query rules for a smaller screen should fire when zooming
> >     in to avoid horizontal scrolling, and it probably should also apply
> >     to images in case a cropped version is used with the layout that
> >     accompanies smaller screens, which may even want a different aspect
> >     ratio.
> >
> >     So I think chrome and firefox are doing the right thing, it's just I
> >     don't understand how to tell them to use a higher resolution version
> >     if the pixels are there but the browser is zoomed in.
> >
> >     There must be a way.
> >
> >     On 03/01/2015 01:28 AM, Yoav Weiss wrote:
> >
> >         That sounds like a Firefox bug. Did you try the same with
> >         Chrome/Opera?
> >
> >         If it works there, you would probably file a bug with Firefox.
> If it
> >         doesn't, you should probably file a bug with both :)
> >
> >         On Mar 1, 2015 7:13 AM, "Alice Wonder" <alice@domblogger.net
> >         <mailto:alice@domblogger.net>
> >         <mailto:alice@domblogger.net <mailto:alice@domblogger.net>>>
> wrote:
> >
> >              Hi,
> >
> >              It is hard to find examples of the picture element online
> that
> >              actually validate but I have it at this point.
> >
> >              Have my firefox set up and it works.
> >
> >              Did this test :
> >
> >              [picture]
> >                 [source media="(min-width: 801px)"
> srcset="Camera_800.jpg"
> >              type="image/jpeg" /]
> >                 [source media="(max-width: 800px)"
> srcset="Camera_400.jpg"
> >              type="image/jpeg" /]
> >                 [img src="Camera_800.jpg" alt="Classic Medium Format
> >         Camera" /]
> >              [/picture]
> >
> >              (using [] instead of angle brackets)
> >
> >              When I shring the browser down and reload - it works, the
> >         400 is used.
> >
> >              But - when I ctrl-+ to zoom in and then reload, it also
> >         triggers the
> >              media query, and the result is a way over-stretched 400px
> >         version.
> >
> >              What is the proper way to take physical pixels into
> >         consideration so
> >              that people who zoom in due to visual problems don't get a
> >         smaller
> >              version that has been stretched?
> >
> >
> >
>
Received on Sunday, 1 March 2015 10:37:25 UTC

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