HR is used to draw horizontal rules across the browser window.
A horizontal rule is typically used to separate sections within a document. In HTML 3.2, the appearance can be controlled more than in HTML 2. You can specify the thickness of the rule with the SIZE attribute, which takes an integer number of pixels. None of the attributes for HR existed in HTML 2, so they may not be supported by all browsers. Setting an absolute width is not recommended, since you have no way to know how wide the currently available window is.