line dra html code example

Example 1: which is right or in html

<hr> <!--   it represents a horizontal line break, in HTML4.0 we use <hr>, 
            in XHTML1.0 we use <hr/>,  in HTML5(which is the current version of 
            HTML) we can use both <hr> and <hr/>    
       -->

Example 2: how to draw a horizontal line in javascript

var elem = document.createElement("hr");
elem.setAttribute("width", "100px");
document.body.appendChild(elem);