Bootstrap样式<abbr>元素的底部带有浅点边框，并在悬停时显示了全文。
HTML <abbr>元素提供缩写或首字母缩写的标记，例如NASA，HTTPS，ICC等。
您可以尝试运行以下命令以了解Bootstrap如何设置<abbr>元素的样式-
<!DOCTYPE html> <html> <head> <title>Bootstrap abbr styling</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script> <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> </head> <body> <abbr title = "National Aeronautics and Space Administration">NASA</abbr><br> <abbr title = "International Cricket Council">ICC</abbr> </body> </html>