[Webkit-unassigned] [Bug 270057] Remove non-standard `webkitBackingStorePixelRatio`

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=270057

--- Comment #5 from Ahmad Saleem <ahmad.saleem792 at gmail.com> ---
(In reply to Brent Fulgham from comment #4)
> Note that all major browsers seem to have an analog of this:
> 
> ```
>     context.webkitBackingStorePixelRatio ||
>     context.mozBackingStorePixelRatio ||
>     context.msBackingStorePixelRatio ||
> ```
> 
> We will want to make sure this doesn't break sites that try to use this for
> something.

I have updated it to check for `moz` - https://jsfiddle.net/z069fcp2/3/

It is `undefined` in Mozilla Firefox.

Additionally - people are using following workaround - https://gist.github.com/callumlocke/cc258a193839691f60dd

leveraging `devicePixelRatio` to workaround the functionality provided by this API.

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