- From: Tab Atkins Jr. via GitHub <sysbot+gh@w3.org>
- Date: Mon, 30 Apr 2018 19:16:47 +0000
- To: public-fxtf-archive@w3.org
There's a difference between "the background that gets propagated to the canvas" (from `html` or `body`) and the underlying backdrop (which is UA-specific and undefined).
If filters on `html` apply to the canvas backdrop, what happens with `html { filter: opacity(50%); }`? What shows thru? Presumably not whatever window is underneath the browser window. ^_^
Obviously, there's *some* background that isn't affected by the filter, so that you can show something underneath an opacity() filter. Rather than inventing *yet another* layer to explain this, let's just be consistent with previous resolutions (such as [our resolution that `background-blend-mode` blends with the `html` background, not the canvas backdrop](https://lists.w3.org/Archives/Public/www-style/2014Jun/0380.html).
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Received on Monday, 30 April 2018 19:16:51 UTC