Use this tag when you see a message in the browser devtools console about CORS (Cross-Origin Resource Sharing) — e.g., your browser logged an error about Access-Control-Allow-Origin, and you want to know how to eliminate the error. Also for other questions on the CORS protocol (defined in the Fetch Standard as a way to use response headers to tell browsers to relax the same-origin policy and allow cross-origin XHR/Fetch/Ajax requests).

Event handling is a coding style about handling messages between a source and one or more subscribers. A point listener in the source provide a way which subscribed code can consume messages raised from the source.

MapReduce is an algorithm for processing huge datasets on certain kinds of distributable problems using a large number of nodes

Component Object Model (COM) is a component technology from Microsoft, featuring remoting, language independence and interface-based programming. For questions about the COM serial port, you should use the [serial-port] tag instead.

Geolocation is the identification of the real-world geographic location of an object, such as a cell phone or an Internet-connected computer terminal. Use [w3c-geolocation] for questions about the W3C Geolocation API.

The EditText is the standard text entry widget in Android apps. If the user needs to enter text into an app, this is the primary way for them to do that.

A namespace is a container that provides context for identifiers, within which names are unique.

A dependency exists between two elements if changes to the definition of one element may cause changes to the other.

A temporary window presented to a user (usually as a small box). It interrupts program flow, overlaying the UI, for the purpose of alerting the user or requiring user input or confirmation about a program decision. Sometimes dialogs are used to present forms for user input.

The successor to Microsoft Windows 8.1 which combines features from Windows 7 and 8.1, including touch-interface and restored Start Menu. This tag exclusively is for programming questions related to Windows 10; general software issues not directly related to programming should be directed to Super User.

The term Lucene refers to the open source Java fulltext search engine library, but also to the entire eco-system that grew around it, including lucene.net, solr, elasticsearch and zend-search-lucene.