Deprecated Guide, Meaning , Facts, Information and Description
In computing, deprecated features or methods are those that are considered obsolete, and though they may still be effective, are being phased out.For example, the markup language HTML, used for web pages, has been standardized by the World Wide Web Consortium. Whenever a newer version of HTML is published, W3C may decide that some old HTML style tags are not needed, since new methods exist to express the same thing. Such tags are said to be deprecated.
This means the members of W3C have decided not to guarantee their availability in future versions of HTML. Popular web browsers still understand most deprecated tags. However, a new browser may ignore them while being advertised as "HTML 4.0 compliant".
To learn more about web page (HTML) formatting, see Cascading Style Sheets.
Deprecation can be seen as the middle of a continuum of support status, from supported, through deprecated, and ending with unsupported.
An example of this occurred when Apple Computer transitioned its operating system platform from Mac OS 9 to Mac OS X. In the transition period, when Mac OS 9 was the deployed operating system, but OS X had been specified, all API functions that would be supported in both were declared supported, forming the Carbon compatibility environment and APIs that would not be incorporated in OS X were labeled deprecated. When the OS X platform was deployed, the deprecated API's became unsupported, and would only be usable through emulation of the older OS. Carbon is still supported under Mac OS X, making it very easy to rebuild a Mac OS 9 application for Mac OS X using Carbon.
Etymology
In English, the word deprecate traditionally means "to strongly disapprove of" something. It is a back-formation from deprecation, which originally meant a prayer to avert some evil or disaster. Deprecate is also used loosely, and some would say inappropriately, as a substitute for the unrelated word depreciate, which means "to esteem of little value; to reduce in price; to belittle." It is uncertain which use of the word led to its meaning in computer jargon. Individuals who disapprove of such loose usage are typically labelled "prescriptivist" by linguists.
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