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This implements the HTML spec for applying auto sizes to lazy-loaded images by prepending `auto` to the `sizes` attribute generated by WordPress if the image has a `loading` attribute set to `lazy`. For browser that support this HTML spec, the image's size value will be set to the concrete object size of the image. For browsers that don't support the spec, the word "auto" will be ignored when parsing the sizes value. References: - https://html.spec.whatwg.org/multipage/images.html#sizes-attributes - https://github.com/whatwg/html/pull/8008 Props mukesh27, flixos90, joemcgill, westonruter, peterwilsoncc. Fixes #61847. git-svn-id: https://develop.svn.wordpress.org/trunk@59008 602fd350-edb4-49c9-b593-d223f7449a82