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Re: [csswg-drafts] [css-sizing-3][css-images-3] Distinguish intrinsic size's two definitions with two terms (#4961)

From: Simon Sapin via GitHub <sysbot+gh@w3.org>
Date: Wed, 14 Oct 2020 07:39:10 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-708221545-1602661149-sysbot+gh@w3.org>
Natural size sounds good to me, and consistency with HTML seems worthwhile.

HTML defines natural size as [density-corrected](https://html.spec.whatwg.org/multipage/images.html#density-corrected-intrinsic-width-and-height). I *think* we want that.

> When an img element has a current pixel density that is not 1.0, the element's image data must be treated as if its resolution, in device pixels per CSS pixels, was the current pixel density. The image's density-corrected intrinsic width and height are the [intrinsic width and height](https://drafts.csswg.org/css-images/#intrinsic-dimensions) after taking into account the current pixel density.

This is based on a css-images definition, so changing that may require coordination with HTML.

The density in question is [from `srcset`](https://html.spec.whatwg.org/multipage/images.html#pixel-density-descriptor) (through [update image data](https://html.spec.whatwg.org/multipage/images.html#updating-the-image-data:current-pixel-density) and [select an image source](https://html.spec.whatwg.org/multipage/images.html#select-an-image-source) algorithms).

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