Adds Text underline position & text shadow (web-platform-dx#1997)

Co-authored-by: James Stuckey Weber <[email protected]>

Author: 2 people

features/text-shadow.yml

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+name: text-shadow
+description: The `text-shadow` CSS property sets the position and styles of shadow on text.
+spec: https://drafts.csswg.org/css-text-decor-4/#text-shadow-property
+caniuse: css-textshadow
+group: text
+compat_features:
+  - css.properties.text-shadow

features/text-shadow.yml.dist

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+# Generated from: text-shadow.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2015-07-29
+  baseline_high_date: 2018-01-29
+  support:
+    chrome: "2"
+    chrome_android: "18"
+    edge: "12"
+    firefox: "3.5"
+    firefox_android: "4"
+    safari: "1.1"
+    safari_ios: "1"
+compat_features:
+  - css.properties.text-shadow

features/text-underline-position.yml

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+name: Text underline position
+description: "The `text-underline-position` and `text-underline-offset` CSS properties set the position and distance from initial position of text underlines on text with `text-decoration: underline`."
+spec: https://drafts.csswg.org/css-text-decor-4/#line-decoration
+group: text
+status:
+  compute_from: css.properties.text-underline-offset
+compat_features:
+  - css.properties.text-underline-offset
+  - css.properties.text-underline-offset.auto
+  - css.properties.text-underline-offset.percentage
+  - css.properties.text-underline-position
+  - css.properties.text-underline-position.from-font
+  - css.properties.text-underline-position.left
+  - css.properties.text-underline-position.right
+  - css.properties.text-underline-position.under

features/text-underline-position.yml.dist

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+# Generated from: text-underline-position.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: high
+  baseline_low_date: 2020-11-19
+  baseline_high_date: 2023-05-19
+  support:
+    chrome: "87"
+    chrome_android: "87"
+    edge: "87"
+    firefox: "70"
+    firefox_android: "79"
+    safari: "12.1"
+    safari_ios: "12.2"
+compat_features:
+  # baseline: high
+  # baseline_low_date: 2020-07-28
+  # baseline_high_date: 2023-01-28
+  # support:
+  #   chrome: "33"
+  #   chrome_android: "33"
+  #   edge: "12"
+  #   firefox: "74"
+  #   firefox_android: "79"
+  #   safari: "12.1"
+  #   safari_ios: "12.2"
+  - css.properties.text-underline-position
+
+  # baseline: high
+  # baseline_low_date: 2020-07-28
+  # baseline_high_date: 2023-01-28
+  # support:
+  #   chrome: "33"
+  #   chrome_android: "33"
+  #   edge: "79"
+  #   firefox: "74"
+  #   firefox_android: "79"
+  #   safari: "12.1"
+  #   safari_ios: "12.2"
+  - css.properties.text-underline-position.under
+
+  # ⬇️ Same status as overall feature ⬇️
+  # baseline: high
+  # baseline_low_date: 2020-11-19
+  # baseline_high_date: 2023-05-19
+  # support:
+  #   chrome: "87"
+  #   chrome_android: "87"
+  #   edge: "87"
+  #   firefox: "70"
+  #   firefox_android: "79"
+  #   safari: "12.1"
+  #   safari_ios: "12.2"
+  - css.properties.text-underline-offset
+  - css.properties.text-underline-offset.auto
+
+  # baseline: high
+  # baseline_low_date: 2020-11-19
+  # baseline_high_date: 2023-05-19
+  # support:
+  #   chrome: "87"
+  #   chrome_android: "87"
+  #   edge: "87"
+  #   firefox: "74"
+  #   firefox_android: "79"
+  #   safari: "12.1"
+  #   safari_ios: "12.2"
+  - css.properties.text-underline-position.from-font
+
+  # baseline: false
+  # support:
+  #   chrome: "71"
+  #   chrome_android: "71"
+  #   edge: "79"
+  #   firefox: "74"
+  #   firefox_android: "79"
+  - css.properties.text-underline-position.left
+  - css.properties.text-underline-position.right
+
+  # baseline: false
+  # support:
+  #   chrome: "87"
+  #   chrome_android: "87"
+  #   edge: "87"
+  #   firefox: "74"
+  #   firefox_android: "79"
+  - css.properties.text-underline-offset.percentage