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Re: [fxtf-drafts] [filter-effects-2] Backdrop filters should not use BackgroundImage

From: Mason Freed via GitHub <sysbot+gh@w3.org>
Date: Wed, 07 Nov 2018 06:55:22 +0000
To: public-fxtf-archive@w3.org
Message-ID: <issue_comment.created-436523213-1541573721-sysbot+gh@w3.org>
To see how people are using backdrop-filter today, I did some research using [HTTP Archive](https://httparchive.org/) and [Chrome Platform Stats](https://www.chromestatus.com/metrics/css/timeline/popularity/508). The current usage rate for backdrop-filter (unprefixed) is very low, about 0.0003%. That number does not include prefixed (-webkit-backdrop-filter) usage, so I used HTTP Archive to pull all pages that use backdrop-filter. Of those, about half use **only** the prefixed version, so the actual usage rate might be higher by 2-5X, which is still quite small. Another analysis based on summed Alexa ranks for each page results in a factor of about 3x. In all cases, the existing usage is quite small.

I also looked at the pages themselves that currently make use of backdrop-filter. I was only able to locate two high-ranking sites that have a visible element styled with backdrop-filter. One is [Apple](https://www.apple.com/), and the other is [the Github Blog](https://blog.github.com/). Both use nearly the same DOM structure, as I mentioned above: an element nested directly within the `<body>` with a high z-index value. And as I mentioned, this works perfectly well with our proposal to have backdrop-filter respect isolation boundaries.

We are still curious what effects would be difficult to achieve, if backdrop-filter were specified to respect isolation boundaries. Input appreciated!

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Received on Wednesday, 7 November 2018 06:55:24 UTC

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