What Is a STRONG Tag/Element? - XHTML 1.0 Tutorials - Understanding In-line Elements and Tags

A "strong" element is an inline element that you can use to specify text with a strong emphasis. Here are basic rules about "strong" elements:

• "strong" elements are inline elements.
• "strong" elements can not be used at block level.
• Contents of "strong" elements will be displayed in bold by most browsers.
• "strong" elements will be treated like "b" elements by most browsers.
• "b" elements may not be supported in future versions of XHTML, You should not use "b" elements in your XHTML.

Here is a good example of "strong" and "b" elements:

<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
 <head>
  <title>STRONG and B Elements</title>
 </head>
 <body>
  <p>The <strong>Rich</strong> must live more simply
  so that the <b>Poor</b> may simply live.</p> 
 </body>
</html>

If you save the above document as strong_and_b.html, and view it with Internet Explorer, you will see that contents in both "strong" and "b" are displayed in bold as shown below: