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randomMDN
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A bot that shares random articles on MDN.

This bot is NOT related to or developed by @mozilla.

Honorable mentions:
- @stefan: twitter bot original
- @jaandrle

[bridged from https://front-end.social/@randomMDN on the fediverse by https://fed.brid.gy/ ]
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randommdn.front-end.social.ap.brid.gy
πŸ¦– HTML itemprop global attribute πŸ¦–

https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Global_attributes/itemprop

The itemprop global attribute is used to add properties to an item. Every HTML element can have an itemprop attribute specified, and an itemprop consists of a name-value […]
Original post on front-end.social
front-end.social
February 13, 2026 at 7:14 PM
randommdn.front-end.social.ap.brid.gy
πŸ¦– TypeError: derived class constructor returned invalid value x πŸ¦–

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Invalid_derived_return

The JavaScript exception "derived class constructor returned invalid value x" occurs when a derived class constructor returns a […]
Original post on front-end.social
front-end.social
February 13, 2026 at 10:11 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– store: Wasm text instruction πŸ¦–

https://developer.mozilla.org/en-US/docs/WebAssembly/Reference/Memory/store

The store memory instructions, are used to store a number on the stack in a memory.

#webdev
store: Wasm text instruction - WebAssembly | MDN
The store memory instructions, are used to store a number on the stack in a memory.
developer.mozilla.org
February 12, 2026 at 7:21 PM
randommdn.front-end.social.ap.brid.gy
πŸ¦– Handling whitespace πŸ¦–

https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Text/Whitespace

The presence of whitespace in the DOM can cause layout problems and make manipulation of the content tree difficult in unexpected ways, depending on where it is located. This article explores when […]
Original post on front-end.social
front-end.social
February 12, 2026 at 10:13 AM
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πŸ¦– RTCInboundRtpStreamStats: totalDecodeTime property
🟧 Limited availability

https://developer.mozilla.org/en-US/docs/Web/API/RTCInboundRtpStreamStats/totalDecodeTime

The totalDecodeTime property of the RTCInboundRtpStreamStats dictionary indicates the total time spend decoding frames for this […]
Original post on front-end.social
front-end.social
February 11, 2026 at 7:20 PM
randommdn.front-end.social.ap.brid.gy
πŸ¦– PerformanceEntry: startTime property
βœ… Widely available (from Sept 2017)

https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEntry/startTime

The read-only startTime property returns the first timestamp recorded for this PerformanceEntry. The meaning of this property depends on the […]
Original post on front-end.social
front-end.social
February 11, 2026 at 10:14 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– CSSStyleDeclaration: item() method
βœ… Widely available (from Jul 2015)

https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleDeclaration/item

The CSSStyleDeclaration.item() method interface returns a CSS property name from a CSSStyleDeclaration by index.

#webdev
CSSStyleDeclaration: item() method - Web APIs | MDN
The CSSStyleDeclaration.item() method interface returns a CSS property name from a CSSStyleDeclaration by index.
developer.mozilla.org
February 10, 2026 at 7:23 PM
randommdn.front-end.social.ap.brid.gy
πŸ¦– :-moz-handler-crashed πŸ¦–

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Selectors/:-moz-handler-crashed

The :-moz-handler-crashed CSS pseudo-class is a Mozilla extension that matches elements that can't be displayed because the plugin responsible for drawing them has crashed […]
Original post on front-end.social
front-end.social
February 10, 2026 at 10:16 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– offset-rotate
βœ… Widely available (from Sept 2022)

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/offset-rotate

The offset-rotate CSS property defines the orientation/direction of the element as it is positioned along the offset-path.

#webdev #css
offset-rotate - CSS | MDN
The offset-rotate CSS property defines the orientation/direction of the element as it is positioned along the offset-path.
developer.mozilla.org
February 9, 2026 at 7:27 PM
randommdn.front-end.social.ap.brid.gy
πŸ¦– HTMLInputElement: valueAsNumber property
βœ… Widely available (from Jul 2015)

https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/valueAsNumber

The valueAsNumber property of the HTMLInputElement interface represents the current value of the element as a number or NaN if […]
Original post on front-end.social
front-end.social
February 9, 2026 at 10:18 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– HTMLTableRowElement: rowIndex property
βœ… Widely available (from Jul 2015)

https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableRowElement/rowIndex

The rowIndex read-only property of the HTMLTableRowElement interface represents the position of a row within the whole .

#webdev
HTMLTableRowElement: rowIndex property - Web APIs | MDN
The rowIndex read-only property of the HTMLTableRowElement interface represents the position of a row within the whole .
developer.mozilla.org
February 8, 2026 at 7:06 PM
.

#webdev
randommdn.front-end.social.ap.brid.gy
πŸ¦– AsyncGenerator.prototype.return()
βœ… Widely available (from Jan 2020)

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/AsyncGenerator/return

The return() method of AsyncGenerator instances acts as if a return statement is inserted in the generator's body at the […]
Original post on front-end.social
front-end.social
February 8, 2026 at 10:02 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– DocumentPictureInPicture: enter event
🟧 Limited availability

https://developer.mozilla.org/en-US/docs/Web/API/DocumentPictureInPicture/enter_event

The enter event of the DocumentPictureInPicture interface is fired when the Picture-in-Picture window is successfully opened.

#webdev
DocumentPictureInPicture: enter event - Web APIs | MDN
The enter event of the DocumentPictureInPicture interface is fired when the Picture-in-Picture window is successfully opened.
developer.mozilla.org
February 7, 2026 at 7:05 PM
randommdn.front-end.social.ap.brid.gy
πŸ¦– AudioWorkletProcessor
βœ… Widely available (from Apr 2021)

https://developer.mozilla.org/en-US/docs/Web/API/AudioWorkletProcessor

The AudioWorkletProcessor interface of the Web Audio API represents an audio processing code behind a custom AudioWorkletNode. It lives in the […]
Original post on front-end.social
front-end.social
February 7, 2026 at 10:02 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– Window: originAgentCluster property πŸ¦–

https://developer.mozilla.org/en-US/docs/Web/API/Window/originAgentCluster

The originAgentCluster read-only property of the Window interface returns true if this window belongs to an origin-keyed agent cluster: this means that the operating system has […]
Original post on front-end.social
front-end.social
February 7, 2026 at 12:55 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– ARIA: aria-valuenow attribute πŸ¦–

https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Reference/Attributes/aria-valuenow

The aria-valuenow attribute defines the current value for a range widget.

#webdev #accessibility
ARIA: aria-valuenow attribute - ARIA | MDN
The aria-valuenow attribute defines the current value for a range widget.
developer.mozilla.org
February 6, 2026 at 10:10 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– Document: evaluate() method
βœ… Widely available (from Jul 2015)

https://developer.mozilla.org/en-US/docs/Web/API/Document/evaluate

The evaluate() method of the Document interface selects elements based on the XPath expression given in parameters.

#webdev
Document: evaluate() method - Web APIs | MDN
The evaluate() method of the Document interface selects elements based on the XPath expression given in parameters.
developer.mozilla.org
February 5, 2026 at 7:14 PM
randommdn.front-end.social.ap.brid.gy
πŸ¦– DOMRectReadOnly: right property
βœ… Widely available (from Jan 2020)

https://developer.mozilla.org/en-US/docs/Web/API/DOMRectReadOnly/right

The right read-only property of the DOMRectReadOnly interface returns the right coordinate value of the DOMRect. (Has the same value as x + width, or x if […]
Original post on front-end.social
front-end.social
February 5, 2026 at 10:11 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– SVGGeometryElement: getPointAtLength() method
βœ… Widely available (from Jan 2020)

https://developer.mozilla.org/en-US/docs/Web/API/SVGGeometryElement/getPointAtLength

The SVGGeometryElement.getPointAtLength() method returns the point at a given distance along the path.

#webdev
SVGGeometryElement: getPointAtLength() method - Web APIs | MDN
The SVGGeometryElement.getPointAtLength() method returns the point at a given distance along the path.
developer.mozilla.org
February 4, 2026 at 7:14 PM
randommdn.front-end.social.ap.brid.gy
πŸ¦– opacity
βœ… Widely available (from Jul 2015)

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/opacity

The opacity CSS property sets the opacity of an element. Opacity is the degree to which content behind an element is hidden, and is the opposite of transparency.

#webdev #css
opacity - CSS | MDN
The opacity CSS property sets the opacity of an element. Opacity is the degree to which content behind an element is hidden, and is the opposite of transparency.
developer.mozilla.org
February 4, 2026 at 10:11 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– Document: hasFocus() method
βœ… Widely available (from Jul 2015)

https://developer.mozilla.org/en-US/docs/Web/API/Document/hasFocus

The hasFocus() method of the Document interface returns a boolean value indicating whether the document or any element inside the document has focus. This method […]
Original post on front-end.social
front-end.social
February 3, 2026 at 7:16 PM
randommdn.front-end.social.ap.brid.gy
πŸ¦– CanvasRenderingContext2D: fillRect() method
βœ… Widely available (from Jul 2015)

https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/fillRect

The CanvasRenderingContext2D.fillRect() method of the Canvas 2D API draws a rectangle that is filled according to the current […]
Original post on front-end.social
front-end.social
February 3, 2026 at 10:09 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– CSS values and units πŸ¦–

https://developer.mozilla.org/en-US/docs/Web/CSS/Guides/Values_and_units

Every CSS declaration consists of a property/value pair. The value can take various forms depending on the property, such as a single integer, keyword, function, or a combination of different […]
Original post on front-end.social
front-end.social
February 2, 2026 at 10:13 AM
randommdn.front-end.social.ap.brid.gy
πŸ¦– Storage API
βœ… Widely available (from Dec 2021)

https://developer.mozilla.org/en-US/docs/Web/API/Storage_API

The Storage Standard defines a shared storage system designed to be used by all APIs and technologies that websites can use to store data in a user's browser.

#webdev
Storage API - Web APIs | MDN
The Storage Standard defines a shared storage system designed to be used by all APIs and technologies that websites can use to store data in a user's browser.
developer.mozilla.org
February 1, 2026 at 7:05 PM
randommdn.front-end.social.ap.brid.gy
πŸ¦–
βœ… Widely available (from Jul 2015)

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/percentage

The CSS data type represents a percentage value. It is often used to define a size as relative to an element's parent object. Numerous properties can use […]
Original post on front-end.social
front-end.social
February 1, 2026 at 10:02 AM