js: Added optional browser requirements from ES2021 & Safari 14-15

src/plugin/system/files/js/RapidContext_Browser.js

@@ -164,14 +164,24 @@
         "navigator.credentials.get",
         // "Object.hasOwn",
         "Promise.any",
+        "String.prototype.matchAll",
         "String.prototype.replaceAll",
         "SubtleCrypto.prototype.digest",
         // "Temporal",
         "ResizeObserver",
+        "WeakRef",
         // { test: "HTMLScriptElement.supports('module')", name: "ES module script", },
         // { test: "HTMLScriptElement.supports('importmap')", name: "ES module import maps", },
+        { test: "123_456.78_9_12 == 123456.78912", name: "numeric separators (_)" },
+        { test: "new Error('test', { cause: true }).cause", name: "error cause property" },
         { test: "var a = null; a?.dummy; true", name: "optional chaining operator (?.)" },
         { test: "null ?? true", name: "nullish coalescing operator (??)" },
+        { test: "var a = true; a &&= true; a", name: "logical and assignment operator (&&=)" },
+        { test: "var a = false; a ||= true; a", name: "logical or assignment operator (||=)" },
+        { test: "var a = null; a ??= true; a", name: "nullish assignment operator (??=)" },
+        { test: "class Test { a; b = 123; static c = true; }; Test.c", name: "public class fields" },
+        { test: "class Test { #a; #b = 123; static #c = 0; }; true", name: "private class fields" },
+        { test: "class Test { static { 1; } }; true", name: "static class initialization block" },
         // "selector(:has(*))",
         "appearance: none",
         "inset: 0",