<acronym>
HTML <acronym> Tag
The <acronym> tag defines an acronym or abbreviation. To decipher an acronym, the global title attribute is used (displayed as a pop-up text prompt when you hover the mouse over an acronym). （要解密首字母缩略词，将使用全局标题属性（将鼠标悬停在首字母缩略词上时显示为弹出式文本提示）。）
The <acronym> tag is a deprecated HTML tag and not supported in HTML5. Use the <abbr> tag instead.
Syntax
Syntax （语法）
The <acronym> tag comes in pairs. The content is written between the opening (<acronym>) and closing (</acronym>) tags.
Example of the HTML <acronym> tag:
<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<p>Hover the mouse cursor over acronym HTML</p>
<acronym title="Hyper Text Markup Language">HTML</acronym>
</body>
</html>
In the following example, the HTML <abbr> tag is used instead of <acronym>. The browser renders the characters within the <abbr> tag as an abbreviation or an acronym.
Example of the HTML <abbr> tag:
<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<p><abbr title="Universal Resource Locator">URL</abbr> - This is a special form of designating an individual resource address on the Internet </p>
</body>
</html>
Default styling
Default styling （默认样式）
The default styling of the <acronym> tag varies from one browser to another:
- Opera, Firefox, Chrome style the content with a dotted underline. And, some other browsers not only add a dotted underline but also put it in small caps. （- Opera、Firefox、Chrome使用虚线下划线对内容进行样式设置。而且，其他一些浏览器不仅添加了虚线下划线，还使用小写字母。）
Attributes
Attributes （属性）
The <acronym> tag supports the Global Attributes and the Event Attributes.
How to style <acronym> tag? Common properties to alter the visual weight/emphasis/size of text in <acronym> tag:
CSS font-style property sets the style of the font. normal | italic | oblique | initial | inherit. CSS font-family property specifies a prioritized list of one or more font family names and/or generic family names for the selected element. CSS font-size property sets the size of the font. CSS font-weight property defines whether the font should be bold or thick. CSS text-transform property controls text case and capitalization. CSS text-decoration property specifies the decoration added to text, and is a shorthand property for text-decoration-line, text-decoration-color, text-decoration-style.
Coloring text in <acronym> tag:
CSS color property describes the color of the text content and text decorations. CSS background-color property sets the background color of an element.
Text layout styles for <acronym> tag:
CSS text-indent property specifies the indentation of the first line in a text block. CSS text-overflow property specifies how overflowed content that is not displayed should be signalled to the user. CSS white-space property specifies how white-space inside an element is handled. CSS word-break property specifies where the lines should be broken.
Other properties worth looking at for <acronym> tag:
CSS text-shadow property adds shadow to text. CSS text-align-last property sets the alignment of the last line of the text. CSS line-height property specifies the height of a line. CSS letter-spacing property defines the spaces between letters/characters in a text. CSS word-spacing property sets the spacing between words.