🦖 OpenSearch description format 🦖
https://developer.mozilla.org/en-US/docs/Web/XML/Guides/OpenSearch
The OpenSearch description format can be used to describe the web interface of a search engine. This allows a website to describe a search engine for itself, so that a browser or other client application can use that search engine. OpenSearch is supported by (at least) Firefox, Edge, Safari, and Chrome. (See Reference Material for links to other browsers' documentation.)
🦖 Range: extractContents() method
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/Range/extractContents
The extractContents() method of the Range interface is similar to a combination of Range.cloneContents() and Range.deleteContents(). It removes the child Nodes of the range from the document, clones them, and returns them as a new DocumentFragment object. For partially selected nodes, only the selected text is deleted, but all containing parent…
🦖 AnimationEvent: pseudoElement property
✅ Widely available (from Mar 2020)
https://developer.mozilla.org/en-US/docs/Web/API/AnimationEvent/pseudoElement
The AnimationEvent.pseudoElement read-only property is a string, starting with '::', containing the name of the pseudo-element the animation runs on. If the animation doesn't run on a pseudo-element but on the element, an empty string: ''.
🦖 Document: firstElementChild property
✅ Widely available (from Apr 2018)
https://developer.mozilla.org/en-US/docs/Web/API/Document/firstElementChild
The Document.firstElementChild read-only property returns the document's first child Element, or null if there are no child elements.
🦖 IdentityCredentialRequestOptions 🦖
https://developer.mozilla.org/en-US/docs/Web/API/IdentityCredentialRequestOptions
The IdentityCredentialRequestOptions dictionary represents the object passed to CredentialsContainer.get() as the value of the identity option.
🦖 RTCRtpSender: transport property
✅ Widely available (from Mar 2022)
https://developer.mozilla.org/en-US/docs/Web/API/RTCRtpSender/transport
The read-only transport property of an RTCRtpSender object provides the RTCDtlsTransport object used to interact with the underlying transport over which the sender is exchanging Real-time Transport Control Protocol (RTCP) packets.
🦖 -webkit-text-security 🦖
https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-text-security
-webkit-text-security is a non-standard CSS property that obfuscates characters in a <form> field (such as <input> or <textarea>) by replacing them with a shape. It only affects fields that are not of type=password.
🦖 Compressed texture formats 🦖
https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Compressed_texture_formats
The WebGL API provides methods to use compressed texture formats. These are useful to increase texture detail while limiting the additional video memory necessary. By default, no compressed formats are available: a corresponding compressed texture format extension must first be enabled.
🦖 Clipping and masking 🦖
https://developer.mozilla.org/en-US/docs/Web/SVG/Tutorials/SVG_from_scratch/Clipping_and_masking
Erasing part of what you have created might seem contradictory at first. But when you, for example, try to create a semicircle in SVG, you will find out the use of the following properties quickly:
🦖 TypeError: calling a builtin X constructor without new is forbidden 🦖
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Builtin_ctor_no_new
The JavaScript exception "calling a builtin X constructor without new is forbidden" occurs when you try to call a builtin constructor without using the new keyword. All modern constructors, such as Promise and Map, must be called with new.
🦖 ServiceWorkerGlobalScope: sync event
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScope/sync_event
The sync event of the ServiceWorkerGlobalScope interface is fired when the page (or worker) that registered the event with the SyncManager is running and as soon as network connectivity is available.
🦖 SVGFEDropShadowElement: x property
✅ Widely available (from Jan 2020)
https://developer.mozilla.org/en-US/docs/Web/API/SVGFEDropShadowElement/x
The x read-only property of the SVGFEDropShadowElement interface describes the horizontal coordinate of the position of an SVG filter primitive as a SVGAnimatedLength.
🦖 SVGElement: load event
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/SVGElement/load_event
The load event fires on an SVGElement when it is loaded in the browser, e.g., in the DOM in the case of an embedded <svg>. It is basically the same as the standard load DOM event.
🦖 Temporal.PlainYearMonth.prototype.year
🟧 Limited availability
The year accessor property of Temporal.PlainYearMonth instances returns an integer representing the number of years of this year-month relative to the start of a calendar-specific epoch year. It is calendar-dependent.
🦖 SVGFEDisplacementMapElement: height property
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/SVGFEDisplacementMapElement/height
The height read-only property of the SVGFEDisplacementMapElement interface describes the vertical size of an SVG filter primitive as a SVGAnimatedLength.
🦖 Headers
✅ Widely available (from Mar 2017)
https://developer.mozilla.org/en-US/docs/Web/API/Headers
The Headers interface of the Fetch API allows you to perform various actions on HTTP request and response headers. These actions include retrieving, setting, adding to, and removing headers from the list of the request's headers.
🦖 SVGFESpecularLightingElement: width property
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/SVGFESpecularLightingElement/width
The width read-only property of the SVGFESpecularLightingElement interface describes the horizontal size of an SVG filter primitive as a SVGAnimatedLength.
🦖 BluetoothCharacteristicProperties: broadcast property
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/BluetoothCharacteristicProperties/broadcast
The broadcast read-only property of the BluetoothCharacteristicProperties interface returns a boolean that is true if the broadcast of the characteristic value is permitted using the Server Characteristic Configuration Descriptor.
🦖 animation-duration
✅ Widely available (from Sept 2015)
https://developer.mozilla.org/en-US/docs/Web/CSS/animation-duration
The animation-duration CSS property sets the length of time that an animation takes to complete one cycle.
🦖 GPUCompilationMessage: offset property
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/GPUCompilationMessage/offset
The offset read-only property of the GPUCompilationMessage interface is a number representing the offset from the start of the shader code to the exact point, or the start of the relevant substring, that the message corresponds to.