The Strong object represents an HTML <strong> element.
You can access a <strong> element by using getElementById():
var x = document.getElementById("myStrong");
You can create a <strong> element by using the document.createElement() method:
var x = document.createElement("STRONG");
The Strong object supports the standard properties and events.
HTML tutorial: HTML Text Formatting Elements
HTML reference: HTML <strong> tag
JavaScript reference: HTML DOM Bold Object