Adds shadow parts

features/shadow-parts.yml

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+name: Shadow parts
+description: The `part` and `exportparts` HTML attributes expose elements of a shadow DOM as named parts, which can be selected by the `::part()` CSS pseudo-element for styling.
+spec: https://drafts.csswg.org/css-shadow-parts-1/
+group:
+  - selectors
+  - web-components
+compat_features:
+  - api.Element.part
+  - css.selectors.part
+  - html.global_attributes.exportparts
+  - html.global_attributes.part

features/shadow-parts.yml.dist

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+# Generated from: shadow-parts.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-07-28
+  baseline_high_date: 2023-01-28
+  support:
+    chrome: "73"
+    chrome_android: "73"
+    edge: "79"
+    firefox: "72"
+    firefox_android: "79"
+    safari: "13.1"
+    safari_ios: "13.4"
+compat_features:
+  - api.Element.part
+  - css.selectors.part
+  - html.global_attributes.exportparts
+  - html.global_attributes.part