diff --git a/core/modules/utils/dom/dom.js b/core/modules/utils/dom/dom.js
index 330d184cc..20aa6896d 100644
--- a/core/modules/utils/dom/dom.js
+++ b/core/modules/utils/dom/dom.js
@@ -12,6 +12,8 @@ Various static DOM-related utility functions.
 /*global $tw: false */
 "use strict";
 
+var Popup = require("$:/core/modules/utils/dom/popup.js");
+
 /*
 Determines whether element 'a' contains element 'b'
 Code thanks to John Resig, http://ejohn.org/blog/comparing-document-position/
@@ -294,8 +296,21 @@ exports.collectDOMVariables = function(selectedNode,domNode,event) {
 		});
 		
 		if(selectedNode.offsetLeft) {
-			// Add a variable with a popup coordinate string for the selected node
-			variables["tv-popup-coords"] = "(" + selectedNode.offsetLeft + "," + selectedNode.offsetTop +"," + selectedNode.offsetWidth + "," + selectedNode.offsetHeight + ")";
+			// Add variables with a (relative and absolute) popup coordinate string for the selected node
+			var nodeRect = {
+				left: selectedNode.offsetLeft,
+				top: selectedNode.offsetTop,
+				width: selectedNode.offsetWidth,
+				height: selectedNode.offsetHeight
+			};
+			variables["tv-popup-coords"] = Popup.buildCoordinates(Popup.coordinatePrefix.csOffsetParent,nodeRect);
+
+			var absRect = $tw.utils.extend({}, nodeRect);
+			for (var currentNode = selectedNode.offsetParent; currentNode; currentNode = currentNode.offsetParent) {
+				absRect.left += currentNode.offsetLeft;
+				absRect.top += currentNode.offsetTop;
+			}
+			variables["tv-popup-abs-coords"] = Popup.buildCoordinates(Popup.coordinatePrefix.csAbsolute,absRect);
 
 			// Add variables for offset of selected node
 			variables["tv-selectednode-posx"] = selectedNode.offsetLeft.toString();
diff --git a/core/modules/utils/dom/popup.js b/core/modules/utils/dom/popup.js
index 5eed80c88..017e7da8f 100644
--- a/core/modules/utils/dom/popup.js
+++ b/core/modules/utils/dom/popup.js
@@ -22,6 +22,19 @@ var Popup = function(options) {
 	this.popups = []; // Array of {title:,wiki:,domNode:} objects
 };
 
+/*
+Global regular expression for parsing the location of a popup.
+This is also used by the Reveal widget.
+*/
+exports.popupLocationRegExp = /^(@?)\((-?[0-9\.E]+),(-?[0-9\.E]+),(-?[0-9\.E]+),(-?[0-9\.E]+)\)$/
+
+/*
+Objekt containing the available prefixes for coordinates build with the `buildCoordinates` function:
+ - csOffsetParent: Uses a coordinate system based on the offset parent (no prefix).
+ - csAbsolute: Use an absolute coordinate system (prefix "@").
+*/
+exports.coordinatePrefix = { csOffsetParent: "", csAbsolute: "@" }
+
 /*
 Trigger a popup open or closed. Parameters are in a hashmap:
 	title: title of the tiddler where the popup details are stored
@@ -136,8 +149,17 @@ Popup.prototype.show = function(options) {
 			height: options.domNode.offsetHeight
 		};
 	}
-	var popupRect = "(" + rect.left + "," + rect.top + "," + 
-				rect.width + "," + rect.height + ")";
+	if(options.absolute && options.domNode) {
+		// Walk the offsetParent chain and add the position of the offsetParents to make
+		// the position absolute to the root node of the page.
+		var currentNode = options.domNode.offsetParent;
+		while(currentNode) {
+			rect.left += currentNode.offsetLeft;
+			rect.top += currentNode.offsetTop;
+			currentNode = currentNode.offsetParent;
+		}
+	}
+	var popupRect = exports.buildCoordinates(options.absolute?exports.coordinatePrefix.csAbsolute:exports.coordinatePrefix.csOffsetParent,rect);
 	if(options.noStateReference) {
 		options.wiki.setText(options.title,"text",undefined,popupRect);
 	} else {
@@ -172,13 +194,54 @@ Popup.prototype.cancel = function(level) {
 };
 
 /*
-Returns true if the specified title and text identifies an active popup
+Returns true if the specified title and text identifies an active popup.
+This function is safe to call, even if the popup class was not initialized.
 */
-Popup.prototype.readPopupState = function(text) {
-	var popupLocationRegExp = /^\((-?[0-9\.E]+),(-?[0-9\.E]+),(-?[0-9\.E]+),(-?[0-9\.E]+)\)$/;
-	return popupLocationRegExp.test(text);
+exports.readPopupState = function(text) {
+	return exports.popupLocationRegExp.test(text);
 };
 
+/*
+Parses a coordinate string in the format `(x,y,w,h)` or `@(x,y,z,h)` and returns
+an object containing the position, width and height. The absolute-Mark is boolean
+value that indicates the coordinate system of the coordinates. If they start with
+an `@`, `absolute` is set to true and the coordinates are relative to the root
+element. If the initial `@` is missing, they are relative to the offset parent
+element and `absoute` is false.
+This function is safe to call, even if the popup class was not initialized.
+*/
+exports.parseCoordinates = function(coordinates) {
+	var match = exports.popupLocationRegExp.exec(coordinates);
+	if(match) {
+		return {
+			absolute: (match[1] === "@"),
+			left: parseFloat(match[2]),
+			top: parseFloat(match[3]),
+			width: parseFloat(match[4]),
+			height: parseFloat(match[5])
+		};
+	} else {
+		return false;
+	}
+}
+
+/*
+Builds a coordinate string from a coordinate system identifier and an object
+containing the left, top, width and height values.
+Use constants defined in coordinatePrefix to specify a coordinate system.
+If one of the parameters is invalid for building a coordinate string `(0,0,0,0)`
+will be returned.
+This function is safe to call, even if the popup class was not initialized.
+*/
+exports.buildCoordinates = function(prefix,position) {
+	var coord = prefix + "(" + position.left + "," + position.top + "," + position.width + "," + position.height + ")";
+	if (exports.popupLocationRegExp.test(coord)) {
+		return coord;
+	} else {
+		return "(0,0,0,0)";
+	}
+}
+
 exports.Popup = Popup;
 
 })();
diff --git a/core/modules/widgets/action-popup.js b/core/modules/widgets/action-popup.js
index 2903532b6..a3ce20165 100644
--- a/core/modules/widgets/action-popup.js
+++ b/core/modules/widgets/action-popup.js
@@ -14,6 +14,8 @@ Action widget to trigger a popup.
 
 var Widget = require("$:/core/modules/widgets/widget.js").widget;
 
+var Popup = require("$:/core/modules/utils/dom/popup.js");
+
 var ActionPopupWidget = function(parseTreeNode,options) {
 	this.initialise(parseTreeNode,options);
 };
@@ -57,20 +59,20 @@ Invoke the action associated with this widget
 */
 ActionPopupWidget.prototype.invokeAction = function(triggeringWidget,event) {
 	// Trigger the popup
-	var popupLocationRegExp = /^\((-?[0-9\.E]+),(-?[0-9\.E]+),(-?[0-9\.E]+),(-?[0-9\.E]+)\)$/,
-		match = popupLocationRegExp.exec(this.actionCoords || "");
-	if(match) {
+	var coordinates = Popup.parseCoordinates(this.actionCoords || "");
+	if(coordinates) {
 		$tw.popup.triggerPopup({
 			domNode: null,
 			domNodeRect: {
-				left: parseFloat(match[1]),
-				top: parseFloat(match[2]),
-				width: parseFloat(match[3]),
-				height: parseFloat(match[4])
+				left: coordinates.left,
+				top: coordinates.top,
+				width: coordinates.width,
+				height: coordinates.height
 			},
 			title: this.actionState,
 			wiki: this.wiki,
-			floating: this.floating
+			floating: this.floating,
+			absolute: coordinates.absolute
 		});
 	} else {
 		$tw.popup.cancel(0);
diff --git a/core/modules/widgets/button.js b/core/modules/widgets/button.js
index a32820e8b..a724d8448 100644
--- a/core/modules/widgets/button.js
+++ b/core/modules/widgets/button.js
@@ -14,6 +14,8 @@ Button widget
 
 var Widget = require("$:/core/modules/widgets/widget.js").widget;
 
+var Popup = require("$:/core/modules/utils/dom/popup.js");
+
 var ButtonWidget = function(parseTreeNode,options) {
 	this.initialise(parseTreeNode,options);
 };
@@ -147,7 +149,7 @@ ButtonWidget.prototype.isSelected = function() {
 
 ButtonWidget.prototype.isPoppedUp = function() {
 	var tiddler = this.popupTitle ? this.wiki.getTiddler(this.popupTitle) : this.wiki.getTiddler(this.popup);
-	var result = tiddler && tiddler.fields.text ? $tw.popup.readPopupState(tiddler.fields.text) : false;
+	var result = tiddler && tiddler.fields.text ? Popup.readPopupState(tiddler.fields.text) : false;
 	return result;
 };
 
@@ -173,6 +175,7 @@ ButtonWidget.prototype.triggerPopup = function(event) {
 	if(this.popupTitle) {
 		$tw.popup.triggerPopup({
 			domNode: this.domNodes[0],
+			absolute: (this.popupAbsCoords === "yes"),
 			title: this.popupTitle,
 			wiki: this.wiki,
 			noStateReference: true
@@ -180,6 +183,7 @@ ButtonWidget.prototype.triggerPopup = function(event) {
 	} else {
 		$tw.popup.triggerPopup({
 			domNode: this.domNodes[0],
+			absolute: (this.popupAbsCoords === "yes"),
 			title: this.popup,
 			wiki: this.wiki
 		});
@@ -223,6 +227,7 @@ ButtonWidget.prototype.execute = function() {
 	this.setField = this.getAttribute("setField");
 	this.setIndex = this.getAttribute("setIndex");
 	this.popupTitle = this.getAttribute("popupTitle");
+	this.popupAbsCoords = this.getAttribute("popupAbsCoords", "no");
 	this.tabIndex = this.getAttribute("tabindex");
 	this.isDisabled = this.getAttribute("disabled","no");
 	// Make child widgets
@@ -252,7 +257,7 @@ Selectively refreshes the widget if needed. Returns true if the widget or any of
 */
 ButtonWidget.prototype.refresh = function(changedTiddlers) {
 	var changedAttributes = this.computeAttributes();
-	if(changedAttributes.actions || changedAttributes.to || changedAttributes.message || changedAttributes.param || changedAttributes.set || changedAttributes.setTo || changedAttributes.popup || changedAttributes.hover || changedAttributes.selectedClass || changedAttributes.style || changedAttributes.dragFilter || changedAttributes.dragTiddler || (this.set && changedTiddlers[this.set]) || (this.popup && changedTiddlers[this.popup]) || (this.popupTitle && changedTiddlers[this.popupTitle]) || changedAttributes.setTitle || changedAttributes.setField || changedAttributes.setIndex || changedAttributes.popupTitle || changedAttributes.disabled || changedAttributes["default"]) {
+	if(changedAttributes.actions || changedAttributes.to || changedAttributes.message || changedAttributes.param || changedAttributes.set || changedAttributes.setTo || changedAttributes.popup || changedAttributes.hover || changedAttributes.selectedClass || changedAttributes.style || changedAttributes.dragFilter || changedAttributes.dragTiddler || (this.set && changedTiddlers[this.set]) || (this.popup && changedTiddlers[this.popup]) || (this.popupTitle && changedTiddlers[this.popupTitle]) || changedAttributes.popupAbsCoords || changedAttributes.setTitle || changedAttributes.setField || changedAttributes.setIndex || changedAttributes.popupTitle || changedAttributes.disabled || changedAttributes["default"]) {
 		this.refreshSelf();
 		return true;
 	} else if(changedAttributes["class"]) {
diff --git a/core/modules/widgets/reveal.js b/core/modules/widgets/reveal.js
index 46e55e99e..3e3510f75 100755
--- a/core/modules/widgets/reveal.js
+++ b/core/modules/widgets/reveal.js
@@ -14,6 +14,8 @@ Reveal widget
 
 var Widget = require("$:/core/modules/widgets/widget.js").widget;
 
+var Popup = require("$:/core/modules/utils/dom/popup.js");
+
 var RevealWidget = function(parseTreeNode,options) {
 	this.initialise(parseTreeNode,options);
 };
@@ -94,6 +96,13 @@ RevealWidget.prototype.positionPopup = function(domNode) {
 		left = Math.max(0,left);
 		top = Math.max(0,top);
 	}
+	if (this.popup.absolute) {
+		// Traverse the offsetParent chain and correct the offset to make it relative to the parent node.
+		for (var offsetParentDomNode = domNode.offsetParent; offsetParentDomNode; offsetParentDomNode = offsetParentDomNode.offsetParent) {
+			left -= offsetParentDomNode.offsetLeft;
+			top -= offsetParentDomNode.offsetTop;
+		}
+	}
 	domNode.style.left = left + "px";
 	domNode.style.top = top + "px";
 };
@@ -183,19 +192,11 @@ RevealWidget.prototype.compareStateText = function(state) {
 };
 
 RevealWidget.prototype.readPopupState = function(state) {
-	var popupLocationRegExp = /^\((-?[0-9\.E]+),(-?[0-9\.E]+),(-?[0-9\.E]+),(-?[0-9\.E]+)\)$/,
-		match = popupLocationRegExp.exec(state);
+	this.popup = Popup.parseCoordinates(state);
 	// Check if the state matches the location regexp
-	if(match) {
+	if(this.popup) {
 		// If so, we're open
 		this.isOpen = true;
-		// Get the location
-		this.popup = {
-			left: parseFloat(match[1]),
-			top: parseFloat(match[2]),
-			width: parseFloat(match[3]),
-			height: parseFloat(match[4])
-		};
 	} else {
 		// If not, we're closed
 		this.isOpen = false;
diff --git a/editions/test/tiddlers/tests/test-popup.js b/editions/test/tiddlers/tests/test-popup.js
new file mode 100644
index 000000000..455da2b9b
--- /dev/null
+++ b/editions/test/tiddlers/tests/test-popup.js
@@ -0,0 +1,63 @@
+/*\
+title: test-popup.js
+type: application/javascript
+tags: [[$:/tags/test-spec]]
+
+Tests some utility function of the Popup prototype.
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+describe("Popup tests", function() {
+
+	it("parseCoordinates should parse valid coordinates", function() {
+		var popup = require("$:/core/modules/utils/dom/popup.js");
+
+		expect(popup.parseCoordinates("(1,2,3,4)")).toEqual({absolute: false, left: 1, top: 2, width: 3, height: 4});
+		expect(popup.parseCoordinates("(1.5,2.6,3.7,4.8)")).toEqual({absolute: false, left: 1.5, top: 2.6, width: 3.7, height: 4.8});
+		expect(popup.parseCoordinates("@(1,2,3,4)")).toEqual({absolute: true, left: 1, top: 2, width: 3, height: 4});
+		expect(popup.parseCoordinates("@(1.5,2.6,3.7,4.8)")).toEqual({absolute: true, left: 1.5, top: 2.6, width: 3.7, height: 4.8});
+	});
+
+	it("parseCoordinates should not parse invalid coordinates", function() {
+		var popup = require("$:/core/modules/utils/dom/popup.js");
+
+		expect(popup.parseCoordinates("#(1,2,3,4)")).toEqual(false);
+		expect(popup.parseCoordinates("(1,2,3,4")).toEqual(false);
+		expect(popup.parseCoordinates("(1,2,3)")).toEqual(false);
+	});
+
+	it("buildCoordinates should create valid coordinates", function() {
+		var popup = require("$:/core/modules/utils/dom/popup.js");
+
+		var coordinates = {
+			left: 1.5,
+			top: 2.6,
+			width: 3.7,
+			height: 4.8
+		};
+
+		expect(popup.buildCoordinates(popup.coordinatePrefix.csOffsetParent, coordinates)).toEqual("(1.5,2.6,3.7,4.8)");
+		expect(popup.buildCoordinates(popup.coordinatePrefix.csAbsolute, coordinates)).toEqual("@(1.5,2.6,3.7,4.8)");
+	});
+
+	it("buildCoordinates should detect invalid input", function() {
+		var popup = require("$:/core/modules/utils/dom/popup.js");
+
+		var coordinates = {
+			left: "invalid",
+			top: 2.6,
+			width: 3.7,
+			height: 4.8
+		};
+
+		expect(popup.buildCoordinates(popup.coordinatePrefix.csOffsetParent, coordinates)).toEqual("(0,0,0,0)");
+		expect(popup.buildCoordinates("dummy", coordinates)).toEqual("(0,0,0,0)");
+	});
+});
+
+})();
diff --git a/editions/tw5.com/tiddlers/concepts/CoordinateSystems.tid b/editions/tw5.com/tiddlers/concepts/CoordinateSystems.tid
new file mode 100644
index 000000000..9b66f941b
--- /dev/null
+++ b/editions/tw5.com/tiddlers/concepts/CoordinateSystems.tid
@@ -0,0 +1,42 @@
+created: 20220810201659784
+modified: 20220810201659784
+tags: Concepts
+title: Coordinate Systems
+type: text/vnd.tiddlywiki
+
+TiddlyWiki (primarily the RevealWidget) supports two coordinate systems for positioning popups (see PopupMechanism to learn more about popups).
+
+<<.from-version "5.2.4">> We introduced absolute coordinates that may not work with all extensions and plugins. For maximum backwards compatibility, use absolute coordinates only where necessary.
+
+!! Relative coordinate system
+
+The default coordinate system is relative to the nearest positioned ancestor element. This is either:
+
+* an element with a non-static position, or
+* a ''td'', ''th'', ''table'' in case the element itself is static positioned.
+
+For tiddlers the nearest positioned ancestor element mostly is the body of the tiddler. Read the next chapter to learn about the exceptions.
+
+Relative coordinates are expressed in the form ''(x,y,w,h)''. Where ''x'' and ''y'' represent the position and ''w'' and ''h'' the width and height of the element.
+
+!! Absolute coordinate system
+
+The relative coordinate system works flawless most of the time. Problems occure if the target element (for example, a popup) and the source element (the triggering button) do not share the same positioned ancherstor element. This is often the case if the popup is declared outside a table and the triggering button is declared within a table cell. In this case the coordiante systems have different origins and the popup will be displayed in the wrong location.
+
+Absolute coordinates can fix this problem by using the root element of the page (the upper-left corner of the page) as the origin of the coordinate system. Absolute coordinates are expressed in the form ''@(x,y,w,h)''. Where ''x'' and ''y'' represent the position and ''w'' and ''h'' the width and height of the element. The leading ''@''-symbol marks these coordinates as absolute.
+
+The ButtonWidget has an option (''popupAbsCoords'') to put absolute coordinates into the state tiddler. The DraggableWidget and the EventCatcherWidget provide the absolute coordinate of an event within the attribute `tv-popup-abs-coords`.
+
+
+!! Example
+
+The following example shows a popup that is triggerd from within a table cell. The table cell is the nearest positioned ancestor element. The popup was defined outside the table cell. The button using relative coordinates will open the popup in the wrong location because the button and the popup do not agree on the same coordinate system. Using absolute coordinates fixes this problem.
+
+<<wikitext-example-without-html '<$reveal type="popup" state="$:/state/CoordinateSampleReveal">
+<div class="tc-drop-down">
+Popup
+</div>
+</$reveal>
+
+| Table Row 1 |<$button popup="$:/state/CoordinateSampleReveal">Relative coordinates</$button>|
+| Table Row 2 |<$button popup="$:/state/CoordinateSampleReveal" popupAbsCoords="yes">Absolute coordinates</$button>|'>>
diff --git a/editions/tw5.com/tiddlers/mechanisms/PopupMechanism.tid b/editions/tw5.com/tiddlers/mechanisms/PopupMechanism.tid
index 60566a329..79f3de4c5 100644
--- a/editions/tw5.com/tiddlers/mechanisms/PopupMechanism.tid
+++ b/editions/tw5.com/tiddlers/mechanisms/PopupMechanism.tid
@@ -8,6 +8,7 @@ The popup mechanism allows blocks of content to be selectively displayed and pos
 
 * [[StateTiddlers|StateMechanism]] to record whether a popup is currently displayed or not
 * The RevealWidget to selectively display the popup content
+** <<.from-version "5.2.4">> For positioning the popups relative or absolute coordinates can be used. See [[Coordinate Systems]] for more information about usage and format.
 ** For "sticky" popups — those that don't close when clicking inside one — set the ''class'' attribute to `tc-popup-keep`
 * The ButtonWidget to trigger the display of the popup by setting the state tiddler appropriately
 
diff --git a/editions/tw5.com/tiddlers/widgets/ActionPopupWidget.tid b/editions/tw5.com/tiddlers/widgets/ActionPopupWidget.tid
index e423b6576..590e25a92 100644
--- a/editions/tw5.com/tiddlers/widgets/ActionPopupWidget.tid
+++ b/editions/tw5.com/tiddlers/widgets/ActionPopupWidget.tid
@@ -1,6 +1,6 @@
 caption: action-popup
 created: 20200303114556528
-modified: 20210501203451387
+modified: 20220815205132124
 tags: Widgets ActionWidgets
 title: ActionPopupWidget
 type: text/vnd.tiddlywiki
@@ -15,10 +15,11 @@ The ''action-popup'' widget is invisible. Any content within it is ignored.
 
 |!Attribute |!Description |
 |$state |The title of the state tiddler for the popup |
-|$coords |Optional coordinates for the handle to which popup is positioned (in the format `(x,y,w,h)`) |
+|$coords |Optional coordinates for the handle to which popup is positioned (see [[Coordinate Systems]] for the supported formats) |
 |$floating |<<.from-version "5.2.0">> Optional. Defaults to `no`. Set to `yes` to create a popup that must be closed explicitly. |
 
-<<.from-version "5.1.23">> If the ''$coords'' attribute is missing or empty then all popups are cancelled.
+<<.from-version "5.1.23">> If the ''$coords'' attribute is missing or empty then all popups are cancelled.<br/>
+<<.from-version "5.2.4">> The ''$coords'' attribute supports absolute and relative coordinates. See [[Coordinate Systems]] for more information.
 
 <<.tip "Delete the state tiddler for a floating popup to close it.">>
 
diff --git a/editions/tw5.com/tiddlers/widgets/ButtonWidget.tid b/editions/tw5.com/tiddlers/widgets/ButtonWidget.tid
index e94504659..da61838af 100644
--- a/editions/tw5.com/tiddlers/widgets/ButtonWidget.tid
+++ b/editions/tw5.com/tiddlers/widgets/ButtonWidget.tid
@@ -1,6 +1,6 @@
 caption: button
 created: 20131024141900000
-modified: 20211009121239795
+modified: 20220810192251345
 tags: Widgets TriggeringWidgets
 title: ButtonWidget
 type: text/vnd.tiddlywiki
@@ -37,6 +37,7 @@ The content of the `<$button>` widget is displayed within the button.
 |default |Default value if <<.attr set>> tiddler is missing for testing against <<.attr setTo>> to determine <<.attr selectedClass>> |
 |popup |Title of a state tiddler for a popup that is toggled when the button is clicked. See PopupMechanism for details |
 |popupTitle |Title of a state tiddler for a popup that is toggled when the button is clicked. In difference to the <<.attr popup>> attribute, ''no'' TextReference is used. See PopupMechanism for details |
+|popupAbsCoords |<<.from-version "5.2.4">> If set to ''yes'' writes absolute coordinates to the tiddler referenced by the <<.attr popup>>. If set to ''no'' (the default) uses relative coordinates. See [[Coordinate Systems]] for details |
 |aria-label |Optional [[Accessibility]] label |
 |tooltip |Optional tooltip |
 |class |An optional CSS class name to be assigned to the HTML element|
diff --git a/editions/tw5.com/tiddlers/widgets/DraggableWidget.tid b/editions/tw5.com/tiddlers/widgets/DraggableWidget.tid
index fc65c4e74..c25b15791 100644
--- a/editions/tw5.com/tiddlers/widgets/DraggableWidget.tid
+++ b/editions/tw5.com/tiddlers/widgets/DraggableWidget.tid
@@ -41,7 +41,8 @@ The LinkWidget incorporates the functionality of the DraggableWidget via the ''d
 |!Variables |!Description |
 |`modifier` |The [[modifier Variable]] contains the Modifier Key held while dragging |
 |`dom-*` |All DOM attributes of the node being dragged are made available as variables, with the prefix `dom-` |
-|`tv-popup-coords` |A co-ordinate string that can be used with the ActionPopupWidget to trigger a popup at the DOM node that's being dragged where the event originated |
+|`tv-popup-coords` |A relative co-ordinate string that can be used with the ActionPopupWidget to trigger a popup at the DOM node matching the selector where the event originated (see [[Coordinate Systems]] for more information) |
+|`tv-popup-abs-coords` |<<.from-version "5.2.4">> An absolute co-ordinate string that can be used with the ActionPopupWidget to trigger a popup at the DOM node matching the selector where the event originated (see [[Coordinate Systems]] for more information) |
 |`tv-selectednode-posx` |`x` offset position of the dragged DOM node |
 |`tv-selectednode-posy` |`y` offset position of the dragged DOM node  |
 |`tv-selectednode-width` |`offsetWidth` of the dragged DOM node |
diff --git a/editions/tw5.com/tiddlers/widgets/EventCatcherWidget.tid b/editions/tw5.com/tiddlers/widgets/EventCatcherWidget.tid
index f0c8c257c..5c2568a19 100644
--- a/editions/tw5.com/tiddlers/widgets/EventCatcherWidget.tid
+++ b/editions/tw5.com/tiddlers/widgets/EventCatcherWidget.tid
@@ -1,5 +1,5 @@
 created: 20201123113532200
-modified: 20220507184043398
+modified: 20221012194222875
 tags: Widgets TriggeringWidgets
 title: EventCatcherWidget
 type: text/vnd.tiddlywiki
@@ -10,7 +10,7 @@ type: text/vnd.tiddlywiki
 
 //This is an advanced widget intended for use by those familiar with HTML, CSS and JavaScript handling of DOM events.//
 
-The event catcher widget traps DOM-initiated Javascript events dispatched within its child content, and allows invoking a series of ActionWidgets in response to those events. 
+The event catcher widget traps DOM-initiated Javascript events dispatched within its child content, and allows invoking a series of ActionWidgets in response to those events.
 
 In order for the events to be trapped:
 
@@ -47,7 +47,8 @@ The following variables are made available to the actions:
 |`event-mousebutton` |The mouse button (if any) used to trigger the event (can be "left", "right" or "middle"). Note that not all event types support the mousebutton property |
 |`event-type` |The type property of the JavaScript event |
 |`event-detail-*` |Any properties in the detail attribute of the event are made available with the prefix `event-detail-` |
-|`tv-popup-coords` |A co-ordinate string that can be used with the ActionPopupWidget to trigger a popup at the DOM node matching the selector where the event originated |
+|`tv-popup-coords` |A relative co-ordinate string that can be used with the ActionPopupWidget to trigger a popup at the DOM node matching the selector where the event originated (see [[Coordinate Systems]] for more information) |
+|`tv-popup-abs-coords` |<<.from-version "5.2.4">> An absolute co-ordinate string that can be used with the ActionPopupWidget to trigger a popup at the DOM node matching the selector where the event originated (see [[Coordinate Systems]] for more information) |
 |`tv-widgetnode-width` |<<.from-version "5.2.3">> `offsetWidth` of the DOM node created by the eventcatcher widget |
 |`tv-widgetnode-height` |<<.from-version "5.2.3">> `offsetHeight` of the DOM node created by the eventcatcher widget |
 |`tv-selectednode-posx` |`x` offset position of the selected DOM node |
diff --git a/plugins/tiddlywiki/dynannotate/modules/dynannotate.js b/plugins/tiddlywiki/dynannotate/modules/dynannotate.js
index 9a913384d..00314dab2 100644
--- a/plugins/tiddlywiki/dynannotate/modules/dynannotate.js
+++ b/plugins/tiddlywiki/dynannotate/modules/dynannotate.js
@@ -16,6 +16,8 @@ var TextMap = require("$:/plugins/tiddlywiki/dynannotate/textmap.js").TextMap;
 
 var Widget = require("$:/core/modules/widgets/widget.js").widget;
 
+var Popup = require("$:/core/modules/utils/dom/popup.js");
+
 var DynannotateWidget = function(parseTreeNode,options) {
 	this.initialise(parseTreeNode,options);
 };
@@ -191,7 +193,7 @@ DynannotateWidget.prototype.applyAnnotations = function() {
 				"tv-selection-posy": (bounds.top).toString(),
 				"tv-selection-width": (bounds.width).toString(),
 				"tv-selection-height": (bounds.height).toString(),
-				"tv-selection-coords": "(" + bounds.left + "," + bounds.top + "," + bounds.width + "," + bounds.height + ")"
+				"tv-selection-coords": Popup.buildCoordinates(Popup.coordinatePrefix.csOffsetParent,bounds)
 			});
 			if(self.hasAttribute("popup")) {
 				$tw.popup.triggerPopup({