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<hr> : horizontal rule
The HR element causes a horizontal rule to be rendered by visual user agents.
The amount of vertical space inserted between a rule and the content that surrounds it depends on the user agent.
Attributes
-) align = left|center|right
Deprecated. This attribute specifies the horizontal alignment of the rule with respect to the surrounding context. Possible values:
left: the rule is rendered flush left.
center: the rule is centered.
right: the rule is rendered flush right.
The default is align=center.
-) noshade
Deprecated. When set, this boolean attribute requests that the user agent render the rule in a solid color rather than as the traditional two-color "groove".
-) size
Deprecated. This attribute specifies the height of the rule. The default value for this attribute depends on the user agent.
-) width
Deprecated. This attribute specifies the width of the rule. The default width is 100%, i.e., the rule extends across the entire canvas.


Example

<hr width="50%" size="3" color="green" align="center">

Gives









For complete reference see html reference at W3C
PL..2   PL..3   PL..4   PL..5   PM..1   PM..2   PM..3   PM..4   PM..5   PM..6   PN..1   PN..2   PN..3   PO..1  
PP..1   PP..2   PP..3   PQ..1   PQ..2   PR..1   PR..2   PR..3   PR..4   PR..5   PR..6   PS..1   PS..2   PS..3  
PS..4   PS..5   PS..6   PS..7   PS..8   PS..9   PS..10   PS..11   PS..12   PS..13   PS..14   PS..15   PS..16   PS..17  
PS..18   PS..19   PS..20   PS..21   PS..22   PS..23   PS..24   PS..25   PS..26   PS..27   PS..28   PS..29   PS..30   PS..31