From http://www.w3schools.com (Copyright Refsnes Data)

HTML 5 <hr> tag

Definition and Usage

The <hr> tag inserts a horizontal rule, which should define a thematic change in the content.

Differences Between HTML 4.01 and HTML 5

Attributes: align, noshade, size, and width, were deprecated in HTML 4.01, and are no longer supported in HTML 5.

In HTML 5, the <hr> tag defines a thematic change in the content, and displays a horizontal rule.

In HTML 4.01 it just displayed a horizontal rule.

Example

Source	Output
My car is blue<hr />A banana is a fruit	My car is blue A banana is a fruit

Attributes

4: indicates if the attribute is defined in HTML 4.01
5: indicates if the attribute is defined in HTML 5

Attribute	Value	Description	4
align	center left right	Specifies the alignment of the horizontal rule. Deprecated. Use styles instead	4
noshade	noshade	When set to true the rule should render in a solid color, when set to false the rule should render in a two-color "groove". Deprecated. Use styles instead	4
size	pixels %	Specifies the thickness (height) of the horizontal rule. Deprecated. Use styles instead	4
width	pixels %	Specifies the width of the horizontal rule Deprecated. Use styles instead	4

Standard Attributes

class, contenteditable, contextmenu, dir, draggable, id, irrelevant, lang, ref, registrationmark, tabindex, template, title

For a full description, go to Standard Attributes in HTML 5.

Event Attributes

onabort, onbeforeunload, onblur, onchange, onclick, oncontextmenu, ondblclick, ondrag, ondragend, ondragenter, ondragleave, ondragover, ondragstart, ondrop, onerror, onfocus, onkeydown, onkeypress, onkeyup, onload, onmessage, onmousedown, onmousemove, onmouseover, onmouseout, onmouseup, onmousewheel, onresize, onscroll, onselect, onsubmit, onunload

For a full description, go to Event Attributes in HTML 5.

Try-It-Yourself Demos

Horizontal rule
How to insert a horizontal rule.