This template can be used to indicate, e.g. in template documentation or Wikipedia articles on things like HTML specifications, code that has been deprecated and should not normally be used. On the technical level it is a CSS-styled <del>...</del> that greys out the text (the near-universal sign in computing and computing documentation for "doesn't work", "don't do this", "bad code", "ignore", "option not available", etc.), and removed that element's usual strike-through rendering, which makes the content hard to read.
Parameters
|1= the content to be marked as deprecated
|2= or |title= a mouse-over "tooltip" (in some browsers, anyway), e.g. for briefly explaining the deprecation, e.g. "Deprecated since HTML 3.0" or "Breaks infobox formatting"
|red=y made the text red instead of grey, for indicating dangerous not just deprecated things
|class= assign a CSS class
|id= assign an HTML ID for #linking and other purposes (must be unique on the page and start with an alphabetic letter)
|style= add additional CSS styling
See also
{{!xt}} and related templates for indicating bad (and good) examples
To indicate text is a variable name. Use for any variable names except those including "I" (uppercase i) and/or "l" (lowercase L); for these, {{var serif}} should be used to ensure a noticeable distinction
To display parameters as used in code (i.e. with triple braces), especially to indicate relationships between them. May be combined with {{para}} above
To display parameter values lightly bordered; replaces <code>...</code>, especially when value contains embedded or leading/trailing blanks; visualized here with middot (·) but can use ␠, ▯, or any character.
To showcase with colors in horizontal format the syntax of any template, while providing an easy way to display placeholder texts using colons as separators
To indicate text is source code. To nest other templates within {{code}}, use <code>...</code>. {{codett}} differs only in styling: someMethod becomes someMethod
( or {{dc}}) To indicate deprecated source code in template documentation, articles on HTML specs, etc. The {{dc2}} variant uses strike-through (<blink>) while {{dcr}} uses red (<blink>).
To showcase with colors and multiple lines (vertical format) the syntax of any template, while providing an easy way to display placeholder texts using colons as separators
