__NOTOC__  The template  is used to write an abbreviation with its meaning. It is a wrapper for the HTML element , the element used by most web browsers to create a tooltip indicating the meaning of an abbreviation or acronym.   See  for how to implement similar functionality without abusing markup (though it is also not accessibility-perfect  input sought at Template talk:Hover title).   ব্যবহার   The template  takes two unnamed parameters, in order: 1  – the abbreviation, acronym, or initialism to be explained; shows as text, and may use wikimarkup, such as a link to an article about what it refers to. 2  – the expansion or definition of the abbreviation; shows as the popup when you hover over the abbreviation.  can be used in this parameter. These can also be given as explicitly numbered parameters; this is necessary if a parameter's content contains the equals () character:  Complex example: [[Mass–energy equivalence|{{abbr|{{math|''E'' {{=}} ''mc''<sup>2</sup>}}|2=Energy = mass times the speed of light squared}}]]  Produces:   A third unnamed parameter accepts the following values (which have the same effect): 3  or  – applies the  template to fix the International Phonetic Alphabet rendering on Windows XP.  Named parameters and the input they take: class One or more CSS classes (space-separated if more than one) id An HTML id (i.e., a # link anchor); this must be unique on the entire page style Arbitrary inline CSS to apply to the  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.    উদাহরণ   When hovering over the text "", something like  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.  CompatibilityMarkupRenders as  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 title= 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 ''italics''.   অ্যাক্সেসযোগ্যতা এবং এইচটিএমএল বৈধতা উদ্বেগ   This 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 an 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.).   পুনর্নির্দেশ   The following template names will redirect to :       (deprecated)   টেমপ্লেটতথ্য    আরও দেখুন   , a variant of this template that includes wikilinking.  , used for generating tooltips in general.  , which generates the abbreviation (the code number) for an R-phrase (a "risk phrase", e.g. "Explosive when dry"). The R-phrase itself and a link to List of R-phrases are included in a tooltip.  , which produces the inline superscript:  .  , which allows a main fact to be presented in an article while hiding finer detail which, although factually accurate and maybe of interest to specific readers, might detract from the general readability of the article by cluttering the article if always presented; it allows referencing.