Add <meta name="text-scale"> feature (#3759)

Author: ddbeck

features/meta-text-scale.yml

@@ -0,0 +1,8 @@
+name: <meta name="text-scale">
+description: >
+  The `<meta name="text-scale" content="scale" />` HTML element allows the browser's initial font size to be affected by the operating system text scale settings.
+  The `<meta name="text-scale" content="legacy" />` element is the default behavior that respects only browser font-size settings.
+spec: https://drafts.csswg.org/css-fonts-5/#text-scale-meta
+# Expected:
+# compat_features:
+#   - html.elements.meta.name.text-scale

features/meta-text-scale.yml.dist

@@ -0,0 +1,6 @@
+# Generated from: meta-text-scale.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+status:
+  baseline: false
+  support: {}