Re: What accessibility support exists for low vision?

Quickfire comment: why are you inventing a new term "symmetric 
responsive design"? Changing browser zoom level changes the 
browser-internal mapping of its viewport / pixel density, so the fact 
that, say, 16px text ends up rendering as 64px text at 400% is simply a 
result of the fact that the browser's viewport mapping (its own CSS 
pixels to OS pixels) was changed. It's nothing more than regular 
responsive design. Adding new terminology ("symmetric", which also isn't 
really all that understandable/appt to describe what you're getting at, 
I'd argue) adds nothing other than an extra layer of confusion for 
authors reading the spec.


On 19/07/2017 03:27, Wayne Dick wrote:
> ​Surprisingly I have a complete answer to this problem. Browser Zoom
> applied to "symmetric" responsive design.
> What is symmetric responsive design. Put simply, it is responsive design
> that responds equally  well to changes in device dimensions as it does
> to changes in browser zoom level.
> The general answer is personalization, but for content size symmetric
> responsive design does it.
> How precisely does it work:
> 1. For now assume our base resolution is 1280 by 720 and our font size
> for running text is 16px. This is the pivot case because it will act
> like 12pt type on other media and  it divides well by 4. Thus 400%
> enlargement creates a 320 by 180 screen where the font size of 16px =
> 64px. That is about the best balance of size and space available for
> very large print.
> So, symetric reaponsive design should follow the list of do's and
> don't's below.
> Do:
>   * Use symmetric responsive design
>   * Make a break point class for resolution 320 by 180
>   * Use Expand / Collapse to give a users a time based sequence of full
>     screen interactions with applications
>   * Use appropriate inline markup
>     ​ to enable adaptation of text
> Don't
>   * Use fixed position banners
>   * Force the main area to occupy less than 80% of the screen space​
>   * Put controls in the middle of the main page area without an on / off
>     mechanism
>   * Put sprites in background images.
> If an author does this. The standard user agent technology becomes the
> best assistive technology available for users with low vision to read
> the web for both passive content and applications.
> Wayne
> ​

Patrick H. Lauke | |
twitter: @patrick_h_lauke | skype: patrick_h_lauke

Received on Wednesday, 19 July 2017 09:58:35 UTC