Add auto-sized lazy images feature (#2986)

* New auto-sized lazy images feature

* Update features/lazy-loading-image-auto-sizes.yml

Co-authored-by: Daniel D. Beck <[email protected]>

* Change ID

---------

Co-authored-by: Daniel D. Beck <[email protected]>

Author: captainbrosset

features/sizes-auto.yml

@@ -0,0 +1,6 @@
+name: '<img sizes="auto" loading="lazy">'
+description: The `sizes="auto"` attribute for the `<img>` HTML element reserves layout space for an image before it loads, avoiding some layout shifts. This attribute only applies to images with the `loading="lazy"` attribute.
+spec: https://html.spec.whatwg.org/multipage/images.html#valdef-sizes-auto
+group: images
+compat_features:
+  - html.elements.img.sizes.auto

features/sizes-auto.yml.dist

@@ -0,0 +1,11 @@
+# Generated from: sizes-auto.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support:
+    chrome: "126"
+    chrome_android: "126"
+    edge: "126"
+compat_features:
+  - html.elements.img.sizes.auto