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https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage Window: localStorage property - Web APIs | MDN The localStorage read-only property of the window interface allows you to access a Storage object for the Document's origin; the stored data is saved across... property web apis window localstorage mdn https://developer.mozilla.org/en-US/docs/Web/API/Element/classList Element: classList property - Web APIs | MDN The read-only classList property of the Element interface contains a live DOMTokenList collection representing the class attribute of the element. This can... property web apis element mdn https://developer.mozilla.org/en-US/docs/Web/API/Document/cookie Document: cookie property - Web APIs | MDN The Document property cookie lets you read and write cookies associated with the document. It serves as a getter and setter for the actual values of the... property web apis document cookie mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEntry/duration PerformanceEntry: duration property - Web APIs | MDN The read-only duration property returns a timestamp that is the duration of the performance entry. The meaning of this property depends on the value of this... property web apis duration mdn https://developer.mozilla.org/en-US/docs/Web/API/Document/documentURI Document: documentURI property - Web APIs | MDN The documentURI read-only property of the Document interface returns the document location as a string. property web apis document mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceTiming/secureConnectionStart PerformanceTiming: secureConnectionStart property - Web APIs | MDN The legacy PerformanceTiming.secureConnectionStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX... property web apis performancetiming mdn https://developer.mozilla.org/en-US/docs/Web/API/URLPattern/port URLPattern: port property - Web APIs | MDN The port read-only property of the URLPattern interface is a string containing the pattern used to match the port part of a URL. property web apis port mdn https://developer.mozilla.org/en-US/docs/Web/API/ProgressEvent/loaded ProgressEvent: loaded property - Web APIs | MDN The ProgressEvent.loaded read-only property is a number indicating the size of the data already transmitted or processed. The progress ratio can be calculated... property web apis loaded mdn https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent/data MessageEvent: data property - Web APIs | MDN The data read-only property of the MessageEvent interface represents the data sent by the message emitter. property web apis messageevent data mdn https://developer.mozilla.org/en-US/docs/Web/API/CSSMathSum/values CSSMathSum: values property - Web APIs | MDN The CSSMathSum.values read-only property of the CSSMathSum interface returns a CSSNumericArray object which contains one or more CSSNumericValue objects. property web apis cssmathsum values mdn https://developer.mozilla.org/en-US/docs/Web/API/CSSTransformValue/is2D CSSTransformValue: is2D property - Web APIs | MDN The read-only is2D property of the CSSTransformValue interface returns whether the transform is 2D or 3D. property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams/size URLSearchParams: size property - Web APIs | MDN The size read-only property of the URLSearchParams interface indicates the total number of search parameter entries. property web apis urlsearchparams size mdn https://developer.mozilla.org/en-US/docs/Web/API/CSSMathProduct/values CSSMathProduct: values property - Web APIs | MDN The CSSMathProduct.values read-only property of the CSSMathProduct interface returns a CSSNumericArray object which contains one or more CSSNumericValue... property web apis cssmathproduct values mdn https://developer.mozilla.org/en-US/docs/Web/API/Request/url Request: url property - Web APIs | MDN The url read-only property of the Request interface contains the URL of the request. property web apis request url mdn https://developer.mozilla.org/en-US/docs/Web/API/NodeIterator/filter NodeIterator: filter property - Web APIs | MDN The NodeIterator.filter read-only property returns a NodeFilter object, that is an object which implements an acceptNode(node) method, used to screen nodes. property web apis filter mdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/innerText HTMLElement: innerText property - Web APIs | MDN The innerText property of the HTMLElement interface represents the rendered text content of a node and its descendants. property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/detail CustomEvent: detail property - Web APIs | MDN The read-only detail property of the CustomEvent interface returns any data passed when initializing the event. property web apis detail mdn https://developer.mozilla.org/en-US/docs/Web/API/ErrorEvent/lineno ErrorEvent: lineno property - Web APIs | MDN The lineno read-only property of the ErrorEvent interface returns an integer containing the line number of the script file on which the error occurred. property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/CSS/paintWorklet_static CSS: paintWorklet static property - Web APIs | MDN The static, read-only paintWorklet property of the CSS interface provides access to the paint worklet, which programmatically generates an image where a CSS... property web apis css static mdn https://developer.mozilla.org/en-US/docs/Web/API/Element/attributes Element: attributes property - Web APIs | MDN The Element.attributes property returns a live collection of all attribute nodes registered to the specified node. It is a NamedNodeMap, not an Array, so it... property web apis element attributes mdn https://developer.mozilla.org/en-US/docs/Web/API/Document/childElementCount Document: childElementCount property - Web APIs | MDN The Document.childElementCount read-only property returns the number of child elements of the document. property web apis document mdn https://developer.mozilla.org/en-US/docs/Web/API/Navigator/userAgent Navigator: userAgent property - Web APIs | MDN The Navigator.userAgent read-only property of the Navigator interface returns the User-Agent (UA) string for the current browser. property web apis navigator useragent mdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement/referrerPolicy HTMLImageElement: referrerPolicy property - Web APIs | MDN property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/scheduler Window: scheduler property - Web APIs | MDN The scheduler read-only property of the Window interface is the entry point for using the Prioritized Task Scheduling API. property web apis window scheduler mdn https://developer.mozilla.org/en-US/docs/Web/API/EventSource/url EventSource: url property - Web APIs | MDN The url read-only property of the EventSource interface returns a string representing the URL of the source. property web apis eventsource url mdn https://developer.mozilla.org/en-US/docs/Web/API/ErrorEvent/filename ErrorEvent: filename property - Web APIs | MDN The filename read-only property of the ErrorEvent interface returns a string containing the name of the script file in which the error occurred. property web apis filename mdn https://developer.mozilla.org/en-US/docs/Web/API/Document/characterSet Document: characterSet property - Web APIs | MDN The Document.characterSet read-only property returns the character encoding of the document that it's currently rendered with. property web apis document mdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/playbackRate HTMLMediaElement: playbackRate property - Web APIs | MDN The HTMLMediaElement.playbackRate property sets the rate at which the media is being played back. This is used to implement user controls for fast forward,... property web apis playbackrate mdn https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType Node: nodeType property - Web APIs | MDN The read-only nodeType property of a Node interface is an integer that identifies what the node is. It distinguishes different kinds of nodes from each other,... property web apis node mdn https://developer.mozilla.org/en-US/docs/Web/API/Response/body Response: body property - Web APIs | MDN The body read-only property of the Response interface is a ReadableStream of the body contents. property web apis response body mdn https://developer.mozilla.org/en-US/docs/Web/API/Navigator/locks Navigator: locks property - Web APIs | MDN The locks read-only property of the Navigator interface returns a LockManager object which provides methods for requesting a new Lock object and querying for... property web apis navigator locks mdn https://developer.mozilla.org/en-US/docs/Web/API/Response/status Response: status property - Web APIs | MDN The status read-only property of the Response interface contains the HTTP status codes of the response. property web apis response status mdn https://developer.mozilla.org/en-US/docs/Web/API/TextEncoderStream/writable TextEncoderStream: writable property - Web APIs | MDN The writable read-only property of the TextEncoderStream interface returns a WritableStream that accepts strings to be encoded into binary data. property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/MutationRecord/removedNodes MutationRecord: removedNodes property - Web APIs | MDN The MutationRecord read-only property removedNodes is a NodeList of nodes removed from a target node by a mutation observed with a MutationObserver. property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/CryptoKey/extractable CryptoKey: extractable property - Web APIs | MDN The read-only extractable property of the CryptoKey interface indicates whether or not the key may be extracted using SubtleCrypto.exportKey() or... property web apis cryptokey extractable mdn https://developer.mozilla.org/en-US/docs/Web/API/URL/href URL: href property - Web APIs | MDN The href property of the URL interface is a string containing the whole URL. property web apis url href mdn https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder/encoding TextEncoder: encoding property - Web APIs | MDN The TextEncoder.encoding read-only property returns a string containing the name of the encoding algorithm used by the specific encoder. property web apis encoding mdn https://developer.mozilla.org/en-US/docs/Web/API/Request/referrerPolicy Request: referrerPolicy property - Web APIs | MDN The referrerPolicy read-only property of the Request interface returns the referrer policy, which governs what referrer information, sent in the Referer... property web apis request mdn https://developer.mozilla.org/en-US/docs/Web/API/Blob/type Blob: type property - Web APIs | MDN The type read-only property of the Blob interface returns the MIME type of the file. property web apis blob type mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceServerTiming/name PerformanceServerTiming: name property - Web APIs | MDN The name read-only property returns a string value of the server-specified metric name. property web apis name mdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLCollection/length HTMLCollection: length property - Web APIs | MDN The HTMLCollection.length property returns the number of items in a HTMLCollection. property web apis length mdn https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent/lastEventId MessageEvent: lastEventId property - Web APIs | MDN The lastEventId read-only property of the MessageEvent interface is a string representing a unique ID for the event. property web apis messageevent mdn https://developer.mozilla.org/en-US/docs/Web/API/XPathResult/singleNodeValue XPathResult: singleNodeValue property - Web APIs | MDN The read-only singleNodeValue property of the XPathResult interface returns a Node value or null in case no node was matched of a result with... property web apis xpathresult mdn https://developer.mozilla.org/en-US/docs/Web/API/DecompressionStream/readable DecompressionStream: readable property - Web APIs | MDN The readable read-only property of the DecompressionStream interface returns a ReadableStream that emits decompressed data as Uint8Array chunks. property web apis readable mdn https://developer.mozilla.org/en-US/docs/Web/API/Navigator/platform Navigator: platform property - Web APIs | MDN The platform property read-only property of the Navigator interface returns a string identifying the platform on which the user's browser is running. property web apis navigator platform mdn https://developer.mozilla.org/en-US/docs/Web/API/XPathResult/booleanValue XPathResult: booleanValue property - Web APIs | MDN The read-only booleanValue property of the XPathResult interface returns the boolean value of a result with XPathResult.resultType being BOOLEAN_TYPE. property web apis xpathresult mdn https://developer.mozilla.org/en-US/docs/Web/API/Node/parentElement Node: parentElement property - Web APIs | MDN The read-only parentElement property of Node interface returns the DOM node's parent Element, or null if the node either has no parent, or its parent isn't a... property web apis node mdn https://developer.mozilla.org/en-US/docs/Web/API/Document/doctype Document: doctype property - Web APIs | MDN The doctype read-only property of the Document interface is a DocumentType object representing the Document Type Declaration (DTD) associated with the current... property web apis document doctype mdn https://developer.mozilla.org/en-US/docs/Web/API/Window/crypto Window: crypto property - Web APIs | MDN The crypto read-only property of the Window interface returns the Crypto object for this window's scope. This object gives web pages access to certain... property web apis window crypto mdn https://developer.mozilla.org/en-US/docs/Web/API/ImageData/colorSpace ImageData: colorSpace property - Web APIs | MDN The read-only ImageData.colorSpace property is a string indicating the color space of the image data. property web apis colorspace mdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLIFrameElement/allow HTMLIFrameElement: allow property - Web APIs | MDN property web apis allow mdn https://developer.mozilla.org/en-US/docs/Web/API/URL/pathname URL: pathname property - Web APIs | MDN The pathname property of the URL interface represents a location in a hierarchical structure. It is a string constructed from a list of path segments, each of... property web apis url mdn https://developer.mozilla.org/en-US/docs/Web/API/Element/localName Element: localName property - Web APIs | MDN The Element.localName read-only property returns the local part of the qualified name of an element. property web apis element mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceTiming/domLoading PerformanceTiming: domLoading property - Web APIs | MDN The legacy PerformanceTiming.domLoading read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, when... property web apis performancetiming mdn https://developer.mozilla.org/en-US/docs/Web/API/CSSMathNegate/value CSSMathNegate: value property - Web APIs | MDN The CSSMathNegate.value read-only property of the CSSMathNegate interface returns a CSSNumericValue object. property web apis value mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceTiming/domContentLoadedEventStart PerformanceTiming: domContentLoadedEventStart property - Web APIs | MDN The legacy PerformanceTiming.domContentLoadedEventStart read-only property returns an unsigned long long representing the moment, in milliseconds since the... property web apis performancetiming mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceTiming/domainLookupEnd PerformanceTiming: domainLookupEnd property - Web APIs | MDN The legacy PerformanceTiming.domainLookupEnd read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch,... property web apis performancetiming mdn https://developer.mozilla.org/en-US/docs/Web/API/XPathResult/numberValue XPathResult: numberValue property - Web APIs | MDN The read-only numberValue property of the XPathResult interface returns the numeric value of a result with XPathResult.resultType being NUMBER_TYPE. property web apis xpathresult mdn https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultWriter/ready WritableStreamDefaultWriter: ready property - Web APIs | MDN The ready read-only property of the WritableStreamDefaultWriter interface returns a Promise that resolves when the desired size of the stream's internal queue... property web apis writablestreamdefaultwriter ready mdn https://developer.mozilla.org/en-US/docs/Web/API/Request/referrer Request: referrer property - Web APIs | MDN The referrer read-only property of the Request interface is set by the user agent to be the referrer of the Request. (e.g., client, no-referrer, or a URL.) property web apis request referrer mdn https://developer.mozilla.org/en-US/docs/Web/API/Node/nextSibling Node: nextSibling property - Web APIs | MDN The read-only nextSibling property of the Node interface returns the node immediately following the specified one in their parent's childNodes, or returns null... property web apis node mdn https://developer.mozilla.org/en-US/docs/Web/API/Element/tagName Element: tagName property - Web APIs | MDN The tagName read-only property of the Element interface returns the tag name of the element on which it's called. property web apis element mdn https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultWriter/desiredSize WritableStreamDefaultWriter: desiredSize property - Web APIs | MDN The desiredSize read-only property of the WritableStreamDefaultWriter interface returns the desired size required to fill the stream's internal queue. property web apis writablestreamdefaultwriter mdn https://developer.mozilla.org/en-US/docs/Web/API/Event/srcElement Event: srcElement property - Web APIs | MDN The deprecated Event.srcElement is an alias for the Event.target property. Use Event.target instead. property web apis event mdn https://developer.mozilla.org/en-US/docs/Web/API/CSSSkewX/ax CSSSkewX: ax property - Web APIs | MDN The ax property of the CSSSkewX interface gets and sets the angle used to distort the element along the x-axis (or abscissa). property web apis ax mdn https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/srcObject HTMLMediaElement: srcObject property - Web APIs | MDN The srcObject property of the HTMLMediaElement interface sets or returns the object which serves as the source of the media associated with the... property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/TextDecoder/fatal TextDecoder: fatal property - Web APIs | MDN The fatal read-only property of the TextDecoder interface is a Boolean indicating whether the error mode is fatal. property web apis fatal mdn https://developer.mozilla.org/en-US/docs/Web/API/MutationRecord/target MutationRecord: target property - Web APIs | MDN The MutationRecord read-only property target is the target (i.e., the mutated/changed node) of a mutation observed with a MutationObserver. property web apis target mdn https://developer.mozilla.org/en-US/docs/Web/API/ProgressEvent/lengthComputable ProgressEvent: lengthComputable property - Web APIs | MDN The ProgressEvent.lengthComputable read-only property is a boolean flag indicating if the resource concerned by the ProgressEvent has a length that can be... property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/Text/assignedSlot Text: assignedSlot property - Web APIs | MDN The read-only assignedSlot property of the Text interface returns the HTMLSlotElement object associated with the element. property web apis text mdn https://developer.mozilla.org/en-US/docs/Web/API/Location/href Location: href property - Web APIs | MDN The href property of the Location interface is a stringifier that returns a string containing the whole URL, and allows the href to be updated. property web apis location href mdn https://developer.mozilla.org/en-US/docs/Web/API/PromiseRejectionEvent/reason PromiseRejectionEvent: reason property - Web APIs | MDN The PromiseRejectionEvent reason read-only property is any JavaScript value or Object which provides the reason passed into Promise.reject(). This in theory... property web apis reason mdn https://developer.mozilla.org/en-US/docs/Web/API/TreeWalker/filter TreeWalker: filter property - Web APIs | MDN The TreeWalker.filter read-only property returns the NodeFilter associated with the TreeWalker. property web apis treewalker filter mdn https://developer.mozilla.org/en-US/docs/Web/API/NamedNodeMap/length NamedNodeMap: length property - Web APIs | MDN The read-only length property of the NamedNodeMap interface is the number of objects stored in the map. property web apis length mdn https://developer.mozilla.org/en-US/docs/Web/API/Request/bodyUsed Request: bodyUsed property - Web APIs | MDN The bodyUsed read-only property of the Request interface is a boolean value that indicates whether the request body has been read yet. property web apis request mdn https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleRule/styleMap CSSStyleRule: styleMap property - Web APIs | MDN The styleMap read-only property of the CSSStyleRule interface returns a StylePropertyMap object which provides access to the rule's property-value pairs. property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/ImageData/width ImageData: width property - Web APIs | MDN The readonly ImageData.width property returns the number of pixels per row in the ImageData object. property web apis width mdn https://developer.mozilla.org/en-US/docs/Web/API/Location/hash Location: hash property - Web APIs | MDN The hash property of the Location interface is a string containing a property web apis location hash mdn https://developer.mozilla.org/en-US/docs/Web/API/DocumentFragment/lastElementChild DocumentFragment: lastElementChild property - Web APIs | MDN The DocumentFragment.lastElementChild read-only property returns the document fragment's last child Element, or null if there are no child elements. property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/Element/children Element: children property - Web APIs | MDN The read-only children property returns a live HTMLCollection which contains all of the child elements of the element upon which it was called. property web apis element children mdn https://developer.mozilla.org/en-US/docs/Web/API/Node/firstChild Node: firstChild property - Web APIs | MDN The read-only firstChild property of the Node interface returns the node's first child in the tree, or null if the node has no children. property web apis node mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceTiming/domInteractive PerformanceTiming: domInteractive property - Web APIs | MDN The legacy PerformanceTiming.domInteractive read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch,... property web apis performancetiming mdn https://developer.mozilla.org/en-US/docs/Web/API/NodeList/length NodeList: length property - Web APIs | MDN The NodeList.length property returns the number of items in a NodeList. property web apis length mdn https://developer.mozilla.org/en-US/docs/Web/API/Element/id Element: id property - Web APIs | MDN The id property of the Element interface represents the element's identifier, reflecting the id global attribute. property web apis element id mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceTiming/loadEventEnd PerformanceTiming: loadEventEnd property - Web APIs | MDN The legacy PerformanceTiming.loadEventEnd read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch, when... property web apis performancetiming mdn https://developer.mozilla.org/en-US/docs/Web/API/CSSMathMax/values CSSMathMax: values property - Web APIs | MDN The CSSMathMax.values read-only property of the CSSMathMax interface returns a CSSNumericArray object which contains one or more CSSNumericValue objects. property web apis values mdn https://developer.mozilla.org/en-US/docs/Web/API/ErrorEvent/colno ErrorEvent: colno property - Web APIs | MDN The colno read-only property of the ErrorEvent interface returns an integer containing the column number of the script file on which the error occurred. property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/Animation/overallProgress Animation: overallProgress property - Web APIs | MDN The overallProgress read-only property of the Animation interface returns a number between 0 and 1 indicating the animation's overall progress towards its... property web apis animation mdn https://developer.mozilla.org/en-US/docs/Web/API/CSSKeywordValue/value CSSKeywordValue: value property - Web APIs | MDN The value property of the CSSKeywordValue interface returns or sets the value of the CSSKeywordValue. property web apis value mdn https://developer.mozilla.org/en-US/docs/Web/API/Event/eventPhase Event: eventPhase property - Web APIs | MDN The eventPhase read-only property of the Event interface indicates which phase of the event flow is currently being evaluated. property web apis event mdn https://developer.mozilla.org/en-US/docs/Web/API/Request/integrity Request: integrity property - Web APIs | MDN The integrity read-only property of the Request interface contains the subresource integrity value of the request. property web apis request integrity mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceServerTiming/description PerformanceServerTiming: description property - Web APIs | MDN The description read-only property returns a string value of the server-specified metric description, or an empty string. property web apis description mdn https://developer.mozilla.org/en-US/docs/Web/API/Request/method Request: method property - Web APIs | MDN The method read-only property of the Request interface contains the request's method (GET, POST, etc.) property web apis request method mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceTiming/domContentLoadedEventEnd PerformanceTiming: domContentLoadedEventEnd property - Web APIs | MDN The legacy PerformanceTiming.domContentLoadedEventEnd read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX... property web apis performancetiming mdn https://developer.mozilla.org/en-US/docs/Web/API/CSSFontPaletteValuesRule/fontFamily CSSFontPaletteValuesRule: fontFamily property - Web APIs | MDN The read-only fontFamily property of the CSSFontPaletteValuesRule interface lists the font families the rule can be applied to. The font families must be named... property web apis mdn https://developer.mozilla.org/en-US/docs/Web/API/URL/origin URL: origin property - Web APIs | MDN The origin read-only property of the URL interface returns a string containing the Unicode serialization of the origin of the represented URL. property web apis url origin mdn https://developer.mozilla.org/en-US/docs/Web/API/PerformanceTiming/domainLookupStart PerformanceTiming: domainLookupStart property - Web APIs | MDN The legacy PerformanceTiming.domainLookupStart read-only property returns an unsigned long long representing the moment, in milliseconds since the UNIX epoch,... property web apis performancetiming mdn https://developer.mozilla.org/en-US/docs/Web/API/TreeWalker/root TreeWalker: root property - Web APIs | MDN The TreeWalker.root read-only property returns the root Node that the TreeWalker traverses. property web apis treewalker root mdn https://developer.mozilla.org/en-US/docs/Web/API/Element/previousElementSibling Element: previousElementSibling property - Web APIs | MDN The Element.previousElementSibling read-only property returns the Element immediately prior to the specified one in its parent's children list, or null if the... property web apis element mdn https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal/aborted AbortSignal: aborted property - Web APIs | MDN The aborted read-only property returns a value that indicates whether the asynchronous operations the signal is communicating with are aborted (true) or not... property web apis mdn