Template:Abbr/doc

The template Abbr is used to write an abbreviation (including an acronym or initialism) with its meaning. It is a wrapper for the HTML element , to create a tooltip indicating the meaning of the term. The Tooltip variant is the same, except it uses the element, and is for providing mouse-over notes about non-abbreviations.

Note that readers on mobile devices typically do not have a mouse to hover with, and so generally cannot see tooltip contents. Mobile users may access tooltips via a tap by modifying the settings for Reference Tooltips, but this is not so useful on linked text, because the same tap that brings up the tooltip also follows the hyperlink to the destination page. As of 2021, approximately the same number of English Wikipedia page views occur on mobile vs. desktop web browsers.|bar|2-year|access~desktop*mobile-app*mobile-web|monthly

Usage
The template and its  variant take two unnamed parameters, in order: Use explicitly numbered parameters if a parameter's content contains the equals (=) character:
 * 1 or first unnamed parameter: the term to be explained; shows as text, and may use wikimarkup, such as a link to an article about what it refers to.
 * 2 or second unnamed parameter: the expansion or definition or other note about the term; shows as the popup when you hover over the term. can be used in this parameter.
 * Complex example:
 * Produces: $E = mc^{2}$

Named parameters (usually not needed) and the input they take:
 * class: One or more CSS classes (space-separated if more than one)
 * id: An HTML  (i.e., a   link anchor); this must be unique on the entire page.
 * style: Arbitrary inline CSS to apply to the displayed text of the term (has no effect on the tooltip text). For any input that needs to be quotation-marked (e.g. because it contains a space character), use straight single-quotes only, e.g. font-family: 'Times New Roman', serif;

Examples
When hovering over the text "MSLP", something like Mean Sea Level Pressure will appear as a tooltip in most browsers. Popular screen readers, used by visually impaired readers, give the meaning in a different way.

Linking must be done a particular way
To wiki-link the abbreviation being marked up by this template, wrap the template in the link, not vice versa, or the meaning will not appear in some browsers, including Chrome.

Do not link, or use any other wikimarkup or HTML markup, in the meaning (popup) – only plain text.

The mouse-over popup for the meaning text is created by a  attribute inside an  HTML element's opening tag, so it cannot itself contain any HTML (or markup that resolves to HTML when rendered). This includes simple things like.

Accessibility and HTML validity concerns
Abbr template is intended for use with abbreviations (including acronyms and initialisms).

The Web Content Accessibility Guidelines contain guidelines for using the element generated by this template; see section H28: Providing definitions for abbreviations by using the abbr and acronym elements.

Furthermore, the HTML specifications (both those of the W3C and WHATWG) strictly define the element as reserved for markup of abbreviations. Abusing it for mouse-over tooltips breaks our semantic markup and makes our content (technically, "not well-formed"; it will pass a basic automated validator test because such a tool can't tell that the logical application of the data to the structure isn't correct, only that tags are nested properly, etc.).

Redirects
The following template names will redirect to Abbr:
 * Abbrv
 * Define

Tooltip is a separate template sharing the same documentation.

Template data
 {       "description": "This template defines an abbreviation or acronym, by creating a tooltip that is displayed on mouse-over.", "params": { "1": {                       "label": "Term", "description": "Shows as text", "type": "string/line", "required": true },               "2": {                        "label": "Meaning", "description": "Shows as a mouse-over tooltip", "type": "string", "required": true },               "style": { "label": "CSS", "description": "applies the specified CSS directives to the content of parameter 1", "type": "string", "required": false },               "class": { "label": "Class", "description": "Adds a one or more CSS classes", "type": "string", "required": false },               "id": { "label": "ID", "description": "Adds an HTML id (must be unique in the page)", "type": "string", "required": false }       } } 