diff --git a/compat-table/package-lock.json b/compat-table/package-lock.json
index cb9bbff9e6c..7bd80def8ec 100644
--- a/compat-table/package-lock.json
+++ b/compat-table/package-lock.json
@@ -5,16 +5,16 @@
   "packages": {
     "": {
       "dependencies": {
-        "@mdn/browser-compat-data": "5.3.15",
+        "@mdn/browser-compat-data": "5.3.16",
         "@types/caniuse-lite": "1.0.1",
         "@types/node": "20.3.2",
         "caniuse-lite": "1.0.30001534"
       }
     },
     "node_modules/@mdn/browser-compat-data": {
-      "version": "5.3.15",
-      "resolved": "https://registry.npmjs.org/@mdn/browser-compat-data/-/browser-compat-data-5.3.15.tgz",
-      "integrity": "sha512-h/luqw9oAmMF1C/GuUY/PAgZlF4wx71q2bdH+ct8vmjcvseCY32au8XmYy7xZ8l5VJiY/3ltFpr5YiO55v0mzg=="
+      "version": "5.3.16",
+      "resolved": "https://registry.npmjs.org/@mdn/browser-compat-data/-/browser-compat-data-5.3.16.tgz",
+      "integrity": "sha512-b0kKg2weqKDLI+Ai5+tocgUEIidccdSfzUndbS2YnwIp5aVvd3M0D+DCcbrsSOSgMyrV9QKMqogtqMIjKwvDxw=="
     },
     "node_modules/@types/caniuse-lite": {
       "version": "1.0.1",
diff --git a/compat-table/package.json b/compat-table/package.json
index eab50517d52..715b1af259f 100644
--- a/compat-table/package.json
+++ b/compat-table/package.json
@@ -1,10 +1,10 @@
 {
   "githubDependencies": {
-    "kangax/compat-table": "fe0a67bc1e7b237d5271219529aee695ddfe9e9c",
-    "williamkapke/node-compat-table": "9cacd46dbb63fc8ec5ebceb165cbfdd3ae8d03fa"
+    "kangax/compat-table": "d5e9c83b96b23f15318e6b2dc3f5bf51314aa340",
+    "williamkapke/node-compat-table": "e59188734a19f7595d29dd91643720bcbf0d0647"
   },
   "dependencies": {
-    "@mdn/browser-compat-data": "5.3.15",
+    "@mdn/browser-compat-data": "5.3.16",
     "@types/caniuse-lite": "1.0.1",
     "@types/node": "20.3.2",
     "caniuse-lite": "1.0.30001534"
diff --git a/compat-table/src/index.ts b/compat-table/src/index.ts
index 7e43db47444..97517c6ddb1 100644
--- a/compat-table/src/index.ts
+++ b/compat-table/src/index.ts
@@ -129,7 +129,7 @@ export const cssProperties = {
 export interface Support {
   force?: boolean
   passed?: number
-  failed?: number
+  failed?: Set<string>
 }
 
 export interface VersionRange {
@@ -145,6 +145,7 @@ export interface PrefixData {
 
 export type SupportMap<F extends string> = Record<F, Partial<Record<Engine, Record<string, Support>>>>
 export type VersionRangeMap<F extends string> = Partial<Record<F, Partial<Record<Engine, VersionRange[]>>>>
+export type WhyNotMap<F extends string> = Partial<Record<F, Partial<Record<Engine, string[]>>>>
 export type CSSPrefixMap = Partial<Record<CSSProperty, PrefixData[]>>
 
 const compareVersions = (a: number[], b: number[]): number => {
@@ -187,12 +188,14 @@ const mergePrefixMaps = (to: CSSPrefixMap, from: CSSPrefixMap): void => {
   }
 }
 
-const supportMapToVersionRanges = <F extends string>(supportMap: SupportMap<F>): VersionRangeMap<F> => {
+const supportMapToVersionRanges = <F extends string>(supportMap: SupportMap<F>): [VersionRangeMap<F>, WhyNotMap<F>] => {
   const versionRangeMap: VersionRangeMap<F> = {}
+  const whyNotMap: WhyNotMap<F> = {}
 
   for (const feature in supportMap) {
     const engines = supportMap[feature as F]
     const featureMap: Partial<Record<Engine, VersionRange[]>> = {}
+    const whyNotByEngine: Partial<Record<Engine, string[]>> = {}
 
     // Compute the maximum number of tests that any one engine has passed
     let maxPassed = 0
@@ -206,7 +209,7 @@ const supportMapToVersionRanges = <F extends string>(supportMap: SupportMap<F>):
 
     for (const engine in engines) {
       const versions = engines[engine as Engine]
-      const sortedVersions: { version: number[], supported: boolean }[] = []
+      const sortedVersions: { version: number[], supported: boolean, failed?: Set<string> }[] = []
 
       for (const version in versions) {
         const { force, passed, failed } = versions[version]
@@ -221,11 +224,17 @@ const supportMapToVersionRanges = <F extends string>(supportMap: SupportMap<F>):
             // feature to be unsupported if not all tests were run, since it could
             // be dangerous to assume otherwise.
             !failed && passed === maxPassed,
+          failed,
         })
       }
 
       sortedVersions.sort((a, b) => compareVersions(a.version, b.version))
 
+      if (sortedVersions.length) {
+        const last = sortedVersions[sortedVersions.length - 1]
+        if (last.failed) whyNotByEngine[engine as Engine] = [...last.failed].sort()
+      }
+
       const versionRanges: VersionRange[] = []
       let i = 0
 
@@ -270,9 +279,10 @@ const supportMapToVersionRanges = <F extends string>(supportMap: SupportMap<F>):
     }
 
     versionRangeMap[feature as F] = featureMap
+    whyNotMap[feature as F] = whyNotByEngine
   }
 
-  return versionRangeMap
+  return [versionRangeMap, whyNotMap]
 }
 
 const updateGithubDependencies = (): void => {
@@ -469,7 +479,8 @@ import('./kangax').then(kangax => {
   // MDN data is wrong here: https://www.chromestatus.com/feature/6482797915013120
   js.ClassStaticBlocks.Chrome = { 91: { force: true } }
 
-  generateTableForJS(supportMapToVersionRanges(js))
+  const [jsVersionRanges, jsWhyNot] = supportMapToVersionRanges(js)
+  generateTableForJS(jsVersionRanges, jsWhyNot)
 })
 
 const css: SupportMap<CSSFeature> = {} as SupportMap<CSSFeature>
@@ -481,4 +492,5 @@ mergeSupportMaps(css, mdn.css)
 mergePrefixMaps(cssPrefix, caniuse.cssPrefix)
 mergePrefixMaps(cssPrefix, mdn.cssPrefix)
 
-generateTableForCSS(supportMapToVersionRanges(css), cssPrefix)
+const [cssVersionRanges] = supportMapToVersionRanges(css)
+generateTableForCSS(cssVersionRanges, cssPrefix)
diff --git a/compat-table/src/js_table.ts b/compat-table/src/js_table.ts
index 27a1c0bbf04..ee31548189c 100644
--- a/compat-table/src/js_table.ts
+++ b/compat-table/src/js_table.ts
@@ -1,7 +1,7 @@
 // This file generates "internal/compat/js_table.go"
 
 import fs = require('fs')
-import { Engine, JSFeature, VersionRange, VersionRangeMap, engines } from './index'
+import { Engine, JSFeature, VersionRange, VersionRangeMap, WhyNotMap, engines } from './index'
 
 const jsFeatureString = (feature: string): string => {
   return feature.replace(/([A-Z])/g, '-$1').slice(1).toLowerCase()
@@ -21,17 +21,27 @@ const compareEngines = (a: Engine, b: Engine): number => {
   return lowerA < lowerB ? -1 : lowerA > lowerB ? 1 : 0
 }
 
-const jsTableMap = (map: Partial<Record<Engine, VersionRange[]>>) => {
+const jsTableMap = (map: Partial<Record<Engine, VersionRange[]>>, whyNot: Partial<Record<Engine, string[]>>) => {
+  const lines: string[] = []
+  const whyNotKeys = (Object.keys(whyNot) as Engine[]).sort(compareEngines)
+  for (const engine of whyNotKeys) {
+    const failedTests = whyNot[engine]!
+    lines.push(`\t\t// Note: The latest version of ${JSON.stringify(engine)} failed ` + (failedTests.length === 1
+      ? `this test: ${failedTests[0]}` : `${failedTests.length} tests including: ${failedTests[0]}`))
+  }
+
   const engineKeys = (Object.keys(map) as Engine[]).sort(compareEngines)
   const maxLength = engineKeys.reduce((a, b) => Math.max(a, b.length + 1), 0)
-  if (engineKeys.length === 0) return '{}'
-  return `{\n${engineKeys.map(engine => {
+  for (const engine of engineKeys) {
     const items = map[engine]!.map(range => {
       return `{start: v{${range.start.concat(0, 0).slice(0, 3).join(', ')
         }}${range.end ? `, end: v{${range.end.concat(0, 0).slice(0, 3).join(', ')}}` : ''}}`
     })
-    return `\t\t${(engine + ':').padEnd(maxLength)} {${items.join(', ')}},`
-  }).join('\n')}\n\t}`
+    lines.push(`\t\t${(engine + ':').padEnd(maxLength)} {${items.join(', ')}},`)
+  }
+
+  if (lines.length === 0) return '{}'
+  return `{\n${lines.join('\n')}\n\t}`
 }
 
 const jsTableValidEnginesMap = (engines: Engine[]) => {
@@ -44,7 +54,7 @@ const jsTableValidEnginesMap = (engines: Engine[]) => {
 
 const generatedByComment = `// This file was automatically generated by "js_table.ts"`
 
-export const generateTableForJS = (map: VersionRangeMap<JSFeature>): void => {
+export const generateTableForJS = (map: VersionRangeMap<JSFeature>, whyNot: WhyNotMap<JSFeature>): void => {
   const enginesKeys = (Object.keys(engines) as Engine[]).sort(compareEngines)
 
   fs.writeFileSync(__dirname + '/../internal/compat/js_table.go',
@@ -92,7 +102,7 @@ func (features JSFeature) ApplyOverrides(overrides JSFeature, mask JSFeature) JS
 }
 
 var jsTable = map[JSFeature]map[Engine][]versionRange{
-${Object.keys(map).sort().map(feature => `\t${feature}: ${jsTableMap(map[feature as JSFeature]!)},`).join('\n')}
+${Object.keys(map).sort().map(feature => `\t${feature}: ${jsTableMap(map[feature as JSFeature]!, whyNot[feature as JSFeature]!)},`).join('\n')}
 }
 
 // Return all features that are not available in at least one environment
diff --git a/compat-table/src/kangax.ts b/compat-table/src/kangax.ts
index 8afc17d0f54..b19cb09be1e 100644
--- a/compat-table/src/kangax.ts
+++ b/compat-table/src/kangax.ts
@@ -144,8 +144,12 @@ const updateMap = (map: SupportMap<JSFeature>, feature: JSFeature, engine: Engin
   const engines = map[feature] || (map[feature] = {})
   const versions = engines[engine] || (engines[engine] = {})
   const support = versions[version] || (versions[version] = {})
-  if (passed) support.passed = (support.passed || 0) + 1
-  else support.failed = (support.failed || 0) + 1
+  if (passed) {
+    support.passed = (support.passed || 0) + 1
+  } else {
+    support.failed ||= new Set
+    support.failed.add(testName)
+  }
 }
 
 const mergeIndividualTestResults = (map: SupportMap<JSFeature>, feature: JSFeature, testName: string, res: Record<string, boolean | { val: boolean }>, omit: Engine[]): void => {
diff --git a/internal/compat/js_table.go b/internal/compat/js_table.go
index cabac2e20ae..dabde6d8af8 100644
--- a/internal/compat/js_table.go
+++ b/internal/compat/js_table.go
@@ -195,6 +195,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Node:    {{start: v{16, 0, 0}}},
 	},
 	ArraySpread: {
+		// Note: The latest version of "IE" failed 15 tests including: spread syntax for iterable objects: spreading non-iterables is a runtime error
+		// Note: The latest version of "Rhino" failed 15 tests including: spread syntax for iterable objects: spreading non-iterables is a runtime error
 		Chrome:  {{start: v{46, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{13, 0, 0}}},
@@ -207,6 +209,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{10, 0, 0}}},
 	},
 	Arrow: {
+		// Note: The latest version of "Hermes" failed 3 tests including: arrow functions: lexical "super" binding in constructors
+		// Note: The latest version of "IE" failed 13 tests including: arrow functions: "this" unchanged by call or apply
+		// Note: The latest version of "Rhino" failed 3 tests including: arrow functions: lexical "new.target" binding
 		Chrome:  {{start: v{49, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{13, 0, 0}}},
@@ -218,6 +223,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{10, 0, 0}}},
 	},
 	AsyncAwait: {
+		// Note: The latest version of "Hermes" failed 4 tests including: async functions: async arrow functions
+		// Note: The latest version of "IE" failed 16 tests including: async functions: async arrow functions
+		// Note: The latest version of "Rhino" failed 16 tests including: async functions: async arrow functions
 		Chrome:  {{start: v{55, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{15, 0, 0}}},
@@ -229,6 +237,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{11, 0, 0}}},
 	},
 	AsyncGenerator: {
+		// Note: The latest version of "Hermes" failed this test: Asynchronous Iterators: async generators
+		// Note: The latest version of "IE" failed this test: Asynchronous Iterators: async generators
+		// Note: The latest version of "Rhino" failed this test: Asynchronous Iterators: async generators
 		Chrome:  {{start: v{63, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -240,6 +251,7 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{12, 0, 0}}},
 	},
 	Bigint: {
+		// Note: The latest version of "IE" failed this test: BigInt: basic functionality
 		Chrome:  {{start: v{67, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -253,6 +265,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{14, 0, 0}}},
 	},
 	Class: {
+		// Note: The latest version of "Hermes" failed 24 tests including: class: accessor properties
+		// Note: The latest version of "IE" failed 24 tests including: class: accessor properties
+		// Note: The latest version of "Rhino" failed 24 tests including: class: accessor properties
 		Chrome:  {{start: v{49, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{13, 0, 0}}},
@@ -264,6 +279,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{10, 0, 0}}},
 	},
 	ClassField: {
+		// Note: The latest version of "Hermes" failed 2 tests including: instance class fields: computed instance class fields
+		// Note: The latest version of "IE" failed 2 tests including: instance class fields: computed instance class fields
+		// Note: The latest version of "Rhino" failed 2 tests including: instance class fields: computed instance class fields
 		Chrome:  {{start: v{73, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -275,6 +293,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{14, 0, 0}}},
 	},
 	ClassPrivateAccessor: {
+		// Note: The latest version of "Hermes" failed this test: private class methods: private accessor properties
+		// Note: The latest version of "IE" failed this test: private class methods: private accessor properties
+		// Note: The latest version of "Rhino" failed this test: private class methods: private accessor properties
 		Chrome:  {{start: v{84, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{84, 0, 0}}},
@@ -286,6 +307,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{15, 0, 0}}},
 	},
 	ClassPrivateBrandCheck: {
+		// Note: The latest version of "Hermes" failed this test: Ergonomic brand checks for private fields
+		// Note: The latest version of "IE" failed this test: Ergonomic brand checks for private fields
+		// Note: The latest version of "Rhino" failed this test: Ergonomic brand checks for private fields
 		Chrome:  {{start: v{91, 0, 0}}},
 		Deno:    {{start: v{1, 9, 0}}},
 		Edge:    {{start: v{91, 0, 0}}},
@@ -297,6 +321,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{15, 0, 0}}},
 	},
 	ClassPrivateField: {
+		// Note: The latest version of "Hermes" failed 4 tests including: instance class fields: optional deep private instance class fields access
+		// Note: The latest version of "IE" failed 4 tests including: instance class fields: optional deep private instance class fields access
+		// Note: The latest version of "Rhino" failed 4 tests including: instance class fields: optional deep private instance class fields access
 		Chrome:  {{start: v{84, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{84, 0, 0}}},
@@ -308,6 +335,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{14, 1, 0}}},
 	},
 	ClassPrivateMethod: {
+		// Note: The latest version of "Hermes" failed this test: private class methods: private instance methods
+		// Note: The latest version of "IE" failed this test: private class methods: private instance methods
+		// Note: The latest version of "Rhino" failed this test: private class methods: private instance methods
 		Chrome:  {{start: v{84, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{84, 0, 0}}},
@@ -319,6 +349,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{15, 0, 0}}},
 	},
 	ClassPrivateStaticAccessor: {
+		// Note: The latest version of "Hermes" failed this test: private class methods: private static accessor properties
+		// Note: The latest version of "IE" failed this test: private class methods: private static accessor properties
+		// Note: The latest version of "Rhino" failed this test: private class methods: private static accessor properties
 		Chrome:  {{start: v{84, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{84, 0, 0}}},
@@ -330,6 +363,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{15, 0, 0}}},
 	},
 	ClassPrivateStaticField: {
+		// Note: The latest version of "Hermes" failed this test: static class fields: private static class fields
+		// Note: The latest version of "IE" failed this test: static class fields: private static class fields
+		// Note: The latest version of "Rhino" failed this test: static class fields: private static class fields
 		Chrome:  {{start: v{74, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -341,6 +377,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{14, 1, 0}}},
 	},
 	ClassPrivateStaticMethod: {
+		// Note: The latest version of "Hermes" failed this test: private class methods: private static methods
+		// Note: The latest version of "IE" failed this test: private class methods: private static methods
+		// Note: The latest version of "Rhino" failed this test: private class methods: private static methods
 		Chrome:  {{start: v{84, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{84, 0, 0}}},
@@ -363,6 +402,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{16, 4, 0}}},
 	},
 	ClassStaticField: {
+		// Note: The latest version of "Hermes" failed 2 tests including: static class fields: computed static class fields
+		// Note: The latest version of "IE" failed 2 tests including: static class fields: computed static class fields
+		// Note: The latest version of "Rhino" failed 2 tests including: static class fields: computed static class fields
 		Chrome:  {{start: v{73, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -374,6 +416,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{14, 1, 0}}},
 	},
 	ConstAndLet: {
+		// Note: The latest version of "Hermes" failed 20 tests including: const: for loop statement scope
+		// Note: The latest version of "IE" failed 6 tests including: const: for-in loop iteration scope
+		// Note: The latest version of "Rhino" failed 22 tests including: const: cannot be in statements
 		Chrome:  {{start: v{49, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{14, 0, 0}}},
@@ -386,6 +431,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 	},
 	Decorators: {},
 	DefaultArgument: {
+		// Note: The latest version of "Hermes" failed 2 tests including: default function parameters: separate scope
+		// Note: The latest version of "IE" failed 7 tests including: default function parameters: arguments object interaction
+		// Note: The latest version of "Rhino" failed 7 tests including: default function parameters: arguments object interaction
 		Chrome:  {{start: v{49, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{14, 0, 0}}},
@@ -397,6 +445,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{10, 0, 0}}},
 	},
 	Destructuring: {
+		// Note: The latest version of "Hermes" failed 3 tests including: destructuring, declarations: defaults, let temporal dead zone
+		// Note: The latest version of "IE" failed 71 tests including: destructuring, assignment: chained iterable destructuring
+		// Note: The latest version of "Rhino" failed 33 tests including: destructuring, assignment: computed properties
 		Chrome:  {{start: v{51, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{18, 0, 0}}},
@@ -418,6 +469,7 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{11, 1, 0}}},
 	},
 	ExponentOperator: {
+		// Note: The latest version of "IE" failed 3 tests including: exponentiation (**) operator: assignment
 		Chrome:  {{start: v{52, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{14, 0, 0}}},
@@ -442,6 +494,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{14, 1, 0}}},
 	},
 	ForAwait: {
+		// Note: The latest version of "Hermes" failed this test: Asynchronous Iterators: for-await-of loops
+		// Note: The latest version of "IE" failed this test: Asynchronous Iterators: for-await-of loops
+		// Note: The latest version of "Rhino" failed this test: Asynchronous Iterators: for-await-of loops
 		Chrome:  {{start: v{63, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -453,6 +508,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{12, 0, 0}}},
 	},
 	ForOf: {
+		// Note: The latest version of "IE" failed 9 tests including: for..of loops: iterator closing, break
+		// Note: The latest version of "Rhino" failed 4 tests including: for..of loops: iterator closing, break
 		Chrome:  {{start: v{51, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{15, 0, 0}}},
@@ -479,6 +536,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{16, 3, 0}}},
 	},
 	Generator: {
+		// Note: The latest version of "Hermes" failed 3 tests including: generators: computed shorthand generators, classes
+		// Note: The latest version of "IE" failed 27 tests including: generators: %GeneratorPrototype%
+		// Note: The latest version of "Rhino" failed 15 tests including: generators: %GeneratorPrototype%
 		Chrome:  {{start: v{50, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{13, 0, 0}}},
@@ -490,6 +550,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{10, 0, 0}}},
 	},
 	Hashbang: {
+		// Note: The latest version of "IE" failed this test: Hashbang Grammar
+		// Note: The latest version of "Rhino" failed this test: Hashbang Grammar
 		Chrome:  {{start: v{74, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -520,6 +582,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 	},
 	InlineScript: {},
 	LogicalAssignment: {
+		// Note: The latest version of "IE" failed 9 tests including: Logical Assignment: &&= basic support
+		// Note: The latest version of "Rhino" failed 9 tests including: Logical Assignment: &&= basic support
 		Chrome:  {{start: v{85, 0, 0}}},
 		Deno:    {{start: v{1, 2, 0}}},
 		Edge:    {{start: v{85, 0, 0}}},
@@ -532,6 +596,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{14, 0, 0}}},
 	},
 	NestedRestBinding: {
+		// Note: The latest version of "IE" failed 2 tests including: nested rest destructuring, declarations
+		// Note: The latest version of "Rhino" failed 2 tests including: nested rest destructuring, declarations
 		Chrome:  {{start: v{49, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{14, 0, 0}}},
@@ -544,6 +610,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{10, 1, 0}}},
 	},
 	NewTarget: {
+		// Note: The latest version of "IE" failed 2 tests including: new.target: assignment is an early error
+		// Note: The latest version of "Rhino" failed 2 tests including: new.target: assignment is an early error
 		Chrome:  {{start: v{46, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{14, 0, 0}}},
@@ -562,6 +630,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Node: {{start: v{14, 18, 0}, end: v{15, 0, 0}}, {start: v{16, 0, 0}}},
 	},
 	NullishCoalescing: {
+		// Note: The latest version of "IE" failed this test: nullish coalescing operator (??)
+		// Note: The latest version of "Rhino" failed this test: nullish coalescing operator (??)
 		Chrome:  {{start: v{80, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{80, 0, 0}}},
@@ -588,6 +658,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{3, 1, 0}}},
 	},
 	ObjectExtensions: {
+		// Note: The latest version of "IE" failed 6 tests including: object literal extensions: computed accessors
+		// Note: The latest version of "Rhino" failed 3 tests including: object literal extensions: computed accessors
 		Chrome:  {{start: v{44, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{12, 0, 0}}},
@@ -600,6 +672,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{10, 0, 0}}},
 	},
 	ObjectRestSpread: {
+		// Note: The latest version of "IE" failed 2 tests including: object rest/spread properties: object rest properties
+		// Note: The latest version of "Rhino" failed 2 tests including: object rest/spread properties: object rest properties
 		Chrome:  {{start: v{60, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -612,6 +686,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{11, 1, 0}}},
 	},
 	OptionalCatchBinding: {
+		// Note: The latest version of "IE" failed 3 tests including: optional catch binding: await
+		// Note: The latest version of "Rhino" failed 3 tests including: optional catch binding: await
 		Chrome:  {{start: v{66, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -624,6 +700,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{11, 1, 0}}},
 	},
 	OptionalChain: {
+		// Note: The latest version of "IE" failed 5 tests including: optional chaining operator (?.): optional bracket access
+		// Note: The latest version of "Rhino" failed 5 tests including: optional chaining operator (?.): optional bracket access
 		Chrome:  {{start: v{91, 0, 0}}},
 		Deno:    {{start: v{1, 9, 0}}},
 		Edge:    {{start: v{91, 0, 0}}},
@@ -636,6 +714,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{13, 1, 0}}},
 	},
 	RegexpDotAllFlag: {
+		// Note: The latest version of "IE" failed this test: s (dotAll) flag for regular expressions
+		// Note: The latest version of "Rhino" failed this test: s (dotAll) flag for regular expressions
 		Chrome:  {{start: v{62, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -648,6 +728,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{11, 1, 0}}},
 	},
 	RegexpLookbehindAssertions: {
+		// Note: The latest version of "IE" failed this test: RegExp Lookbehind Assertions
+		// Note: The latest version of "Rhino" failed this test: RegExp Lookbehind Assertions
 		Chrome:  {{start: v{62, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -671,6 +753,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{15, 0, 0}}},
 	},
 	RegexpNamedCaptureGroups: {
+		// Note: The latest version of "Hermes" failed this test: RegExp named capture groups
+		// Note: The latest version of "IE" failed this test: RegExp named capture groups
+		// Note: The latest version of "Rhino" failed this test: RegExp named capture groups
 		Chrome:  {{start: v{64, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{79, 0, 0}}},
@@ -683,6 +768,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 	},
 	RegexpSetNotation: {},
 	RegexpStickyAndUnicodeFlags: {
+		// Note: The latest version of "IE" failed 6 tests including: RegExp "y" and "u" flags: "u" flag
+		// Note: The latest version of "Rhino" failed 6 tests including: RegExp "y" and "u" flags: "u" flag
 		Chrome:  {{start: v{50, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{13, 0, 0}}},
@@ -695,17 +782,23 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{12, 0, 0}}},
 	},
 	RegexpUnicodePropertyEscapes: {
-		Chrome:  {{start: v{64, 0, 0}}},
-		Deno:    {{start: v{1, 0, 0}}},
-		Edge:    {{start: v{79, 0, 0}}},
-		ES:      {{start: v{2018, 0, 0}}},
-		Firefox: {{start: v{78, 0, 0}}},
-		IOS:     {{start: v{11, 3, 0}}},
-		Node:    {{start: v{10, 0, 0}}},
-		Opera:   {{start: v{51, 0, 0}}},
-		Safari:  {{start: v{11, 1, 0}}},
+		// Note: The latest version of "Chrome" failed this test: RegExp Unicode Property Escapes: Unicode 15.1
+		// Note: The latest version of "Firefox" failed this test: RegExp Unicode Property Escapes: Unicode 15.1
+		// Note: The latest version of "Hermes" failed 8 tests including: RegExp Unicode Property Escapes: Unicode 11
+		// Note: The latest version of "IE" failed 8 tests including: RegExp Unicode Property Escapes: Unicode 11
+		// Note: The latest version of "IOS" failed 2 tests including: RegExp Unicode Property Escapes: Unicode 15
+		// Note: The latest version of "Node" failed this test: RegExp Unicode Property Escapes: Unicode 15.1
+		// Note: The latest version of "Rhino" failed 8 tests including: RegExp Unicode Property Escapes: Unicode 11
+		// Note: The latest version of "Safari" failed 2 tests including: RegExp Unicode Property Escapes: Unicode 15
+		Deno:  {{start: v{1, 31, 0}}},
+		Edge:  {{start: v{110, 0, 0}}},
+		ES:    {{start: v{2018, 0, 0}}},
+		Opera: {{start: v{96, 0, 0}}},
 	},
 	RestArgument: {
+		// Note: The latest version of "Hermes" failed this test: rest parameters: function 'length' property
+		// Note: The latest version of "IE" failed 5 tests including: rest parameters: arguments object interaction
+		// Note: The latest version of "Rhino" failed 5 tests including: rest parameters: arguments object interaction
 		Chrome:  {{start: v{47, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{12, 0, 0}}},
@@ -717,6 +810,9 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{10, 0, 0}}},
 	},
 	TemplateLiteral: {
+		// Note: The latest version of "Hermes" failed this test: template literals: TemplateStrings call site caching
+		// Note: The latest version of "IE" failed 7 tests including: template literals: TemplateStrings call site caching
+		// Note: The latest version of "Rhino" failed 2 tests including: template literals: basic functionality
 		Chrome:  {{start: v{41, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{13, 0, 0}}},
@@ -752,6 +848,8 @@ var jsTable = map[JSFeature]map[Engine][]versionRange{
 		Safari:  {{start: v{0, 0, 0}}},
 	},
 	UnicodeEscapes: {
+		// Note: The latest version of "IE" failed 2 tests including: Unicode code point escapes: in identifiers
+		// Note: The latest version of "Rhino" failed 4 tests including: Unicode code point escapes: in identifiers
 		Chrome:  {{start: v{44, 0, 0}}},
 		Deno:    {{start: v{1, 0, 0}}},
 		Edge:    {{start: v{12, 0, 0}}},