different hr in html code example

Example 1: hr tag

<hr style="height:2px;border-width:0;color:gray;background-color:gray">

Example 2: hr tag

The <hr> tag in HTML stands for horizontal rule 
and is used to insert a horizontal rule or a thematic break in an HTML page 
to divide or separate document sections. 
The <hr> tag is an empty tag and it does not require an end tag.