[whatwg] Processing the zoom level - MS extensions to window.screen

[Simon Fraser]

On Nov 20, 2010, at 7:46 AM, Ojan Vafai wrote:

> On Fri, Nov 19, 2010 at 9:21 PM, Robert O'Callahan <robert at ocallahan.org> wrote:
> Most of the use cases for script access to the exact device pixel ratio that I've heard boil down to "interfere with the user's ability to zoom", which is why I haven't been eager to make it easier.
> 
> To be clear, chrome.tabs.getZoomPercentage is a Chrome extension API. Having extensions that can mess with zoom seems like a legit use-case. But I agree, I can't think of good use-cases for the general web being able to.

The only one I can think of is sizing the canvas backing store to get a sharp image on high-resolution displays, and possibly swapping in different image assets from JS.

Simon

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