diff --git a/Tests/LibWeb/Text/expected/all-window-properties.txt b/Tests/LibWeb/Text/expected/all-window-properties.txt
new file mode 100644
index 00000000000..7674cc7efbf
--- /dev/null
+++ b/Tests/LibWeb/Text/expected/all-window-properties.txt
@@ -0,0 +1,371 @@
+AbortController
+AbortSignal
+AbstractRange
+AggregateError
+Animation
+AnimationEffect
+AnimationEvent
+AnimationPlaybackEvent
+AnimationTimeline
+Array
+ArrayBuffer
+Attr
+Audio
+AudioBuffer
+AudioContext
+AudioNode
+AudioParam
+AudioScheduledSourceNode
+AudioTrack
+AudioTrackList
+BaseAudioContext
+BigInt
+BigInt64Array
+BigUint64Array
+Blob
+Boolean
+ByteLengthQueuingStrategy
+CDATASection
+CSSAnimation
+CSSConditionRule
+CSSFontFaceRule
+CSSGroupingRule
+CSSImportRule
+CSSKeyframeRule
+CSSKeyframesRule
+CSSMediaRule
+CSSNamespaceRule
+CSSRule
+CSSRuleList
+CSSStyleDeclaration
+CSSStyleRule
+CSSStyleSheet
+CSSSupportsRule
+CSSTransition
+CanvasGradient
+CanvasPattern
+CanvasRenderingContext2D
+CharacterData
+Clipboard
+CloseEvent
+CloseWatcher
+Comment
+CountQueuingStrategy
+Crypto
+CryptoKey
+CustomElementRegistry
+CustomEvent
+DOMException
+DOMImplementation
+DOMMatrix
+DOMMatrixReadOnly
+DOMParser
+DOMPoint
+DOMPointReadOnly
+DOMQuad
+DOMRect
+DOMRectList
+DOMRectReadOnly
+DOMStringMap
+DOMTokenList
+DataTransfer
+DataView
+Date
+DisposableStack
+Document
+DocumentFragment
+DocumentTimeline
+DocumentType
+DynamicsCompressorNode
+Element
+ElementInternals
+Error
+ErrorEvent
+EvalError
+Event
+EventSource
+EventTarget
+File
+FileList
+FileReader
+FinalizationRegistry
+Float32Array
+Float64Array
+FocusEvent
+FontFace
+FontFaceSet
+FormData
+FormDataEvent
+Function
+GainNode
+HTMLAllCollection
+HTMLAnchorElement
+HTMLAreaElement
+HTMLAudioElement
+HTMLBRElement
+HTMLBaseElement
+HTMLBodyElement
+HTMLButtonElement
+HTMLCanvasElement
+HTMLCollection
+HTMLDListElement
+HTMLDataElement
+HTMLDataListElement
+HTMLDetailsElement
+HTMLDialogElement
+HTMLDirectoryElement
+HTMLDivElement
+HTMLDocument
+HTMLElement
+HTMLEmbedElement
+HTMLFieldSetElement
+HTMLFontElement
+HTMLFormControlsCollection
+HTMLFormElement
+HTMLFrameElement
+HTMLFrameSetElement
+HTMLHRElement
+HTMLHeadElement
+HTMLHeadingElement
+HTMLHtmlElement
+HTMLIFrameElement
+HTMLImageElement
+HTMLInputElement
+HTMLLIElement
+HTMLLabelElement
+HTMLLegendElement
+HTMLLinkElement
+HTMLMapElement
+HTMLMarqueeElement
+HTMLMediaElement
+HTMLMenuElement
+HTMLMetaElement
+HTMLMeterElement
+HTMLModElement
+HTMLOListElement
+HTMLObjectElement
+HTMLOptGroupElement
+HTMLOptionElement
+HTMLOptionsCollection
+HTMLOutputElement
+HTMLParagraphElement
+HTMLParamElement
+HTMLPictureElement
+HTMLPreElement
+HTMLProgressElement
+HTMLQuoteElement
+HTMLScriptElement
+HTMLSelectElement
+HTMLSlotElement
+HTMLSourceElement
+HTMLSpanElement
+HTMLStyleElement
+HTMLTableCaptionElement
+HTMLTableCellElement
+HTMLTableColElement
+HTMLTableElement
+HTMLTableRowElement
+HTMLTableSectionElement
+HTMLTemplateElement
+HTMLTextAreaElement
+HTMLTimeElement
+HTMLTitleElement
+HTMLTrackElement
+HTMLUListElement
+HTMLUnknownElement
+HTMLVideoElement
+HashChangeEvent
+Headers
+History
+IDBFactory
+IDBOpenDBRequest
+IDBRequest
+IdleDeadline
+Image
+ImageBitmap
+ImageData
+Int16Array
+Int32Array
+Int8Array
+InternalError
+IntersectionObserver
+IntersectionObserverEntry
+Iterator
+KeyboardEvent
+KeyframeEffect
+Location
+Map
+MathMLElement
+MediaError
+MediaList
+MediaQueryList
+MediaQueryListEvent
+MessageChannel
+MessageEvent
+MessagePort
+MimeType
+MimeTypeArray
+MouseEvent
+MutationObserver
+MutationRecord
+NamedNodeMap
+NavigateEvent
+Navigation
+NavigationCurrentEntryChangeEvent
+NavigationDestination
+NavigationHistoryEntry
+NavigationTransition
+Navigator
+Node
+NodeFilter
+NodeIterator
+NodeList
+Number
+Object
+OfflineAudioContext
+Option
+OscillatorNode
+PageTransitionEvent
+Path2D
+Performance
+PerformanceEntry
+PerformanceMark
+PerformanceMeasure
+PerformanceObserver
+PerformanceObserverEntryList
+PerformanceTiming
+PeriodicWave
+Plugin
+PluginArray
+PointerEvent
+PopStateEvent
+ProcessingInstruction
+ProgressEvent
+Promise
+PromiseRejectionEvent
+RadioNodeList
+Range
+RangeError
+ReadableByteStreamController
+ReadableStream
+ReadableStreamBYOBReader
+ReadableStreamBYOBRequest
+ReadableStreamDefaultController
+ReadableStreamDefaultReader
+ReferenceError
+RegExp
+Request
+ResizeObserver
+ResizeObserverEntry
+ResizeObserverSize
+Response
+SVGAElement
+SVGAnimatedLength
+SVGAnimatedNumber
+SVGAnimatedRect
+SVGAnimatedString
+SVGAnimatedTransformList
+SVGCircleElement
+SVGClipPathElement
+SVGDefsElement
+SVGDescElement
+SVGElement
+SVGEllipseElement
+SVGForeignObjectElement
+SVGGeometryElement
+SVGGradientElement
+SVGGraphicsElement
+SVGLength
+SVGLineElement
+SVGLinearGradientElement
+SVGMaskElement
+SVGMatrix
+SVGPathElement
+SVGPoint
+SVGPolygonElement
+SVGPolylineElement
+SVGRadialGradientElement
+SVGRect
+SVGRectElement
+SVGSVGElement
+SVGScriptElement
+SVGStopElement
+SVGStyleElement
+SVGSymbolElement
+SVGTSpanElement
+SVGTextContentElement
+SVGTextElement
+SVGTextPathElement
+SVGTextPositioningElement
+SVGTitleElement
+SVGTransform
+SVGTransformList
+SVGUseElement
+Screen
+ScreenOrientation
+Selection
+Set
+ShadowRealm
+ShadowRoot
+SharedArrayBuffer
+StaticRange
+Storage
+String
+StyleSheet
+StyleSheetList
+SubmitEvent
+SubtleCrypto
+SuppressedError
+Symbol
+SyntaxError
+Text
+TextDecoder
+TextEncoder
+TextMetrics
+TimeRanges
+ToggleEvent
+TrackEvent
+TransformStream
+TransformStreamDefaultController
+TreeWalker
+TypeError
+UIEvent
+URIError
+URL
+URLSearchParams
+Uint16Array
+Uint32Array
+Uint8Array
+Uint8ClampedArray
+UserActivation
+ValidityState
+VideoTrack
+VideoTrackList
+VisualViewport
+WeakMap
+WeakRef
+WeakSet
+WebGLContextEvent
+WebGLRenderingContext
+WebKitCSSMatrix
+WebSocket
+WheelEvent
+Window
+Worker
+WritableStream
+WritableStreamDefaultController
+WritableStreamDefaultWriter
+XMLDocument
+XMLHttpRequest
+XMLHttpRequestEventTarget
+XMLHttpRequestUpload
+XMLSerializer
+__preventMultipleTestFunctions
+animationFrame
+asyncTest
+printElement
+println
+promiseTest
+test
+timeout
+webkitURL
diff --git a/Tests/LibWeb/Text/input/all-window-properties.html b/Tests/LibWeb/Text/input/all-window-properties.html
new file mode 100644
index 00000000000..412bcda1b08
--- /dev/null
+++ b/Tests/LibWeb/Text/input/all-window-properties.html
@@ -0,0 +1,18 @@
+<script src="include.js"></script>
+<script>
+    test(() => {
+        const properties = Object.getOwnPropertyNames(window);
+        const constructors = properties.filter(prop => {
+            try {
+                const value = window[prop];
+                return typeof value === 'function' && !!value.prototype;
+            } catch (e) {
+                return false;
+            }
+        });
+        constructors.sort();
+
+        for (const c of constructors)
+            println(c);
+    });
+</script>