HTML - Heading elements

h1, h2, h3, h4, h5 and h6.

The W3C HTML5 specification describes six HTML heading elements: h1, h2, h3, h4, h5 and h6. ref

The height of a heading element is specified in the browser's default stylesheet. See col 4 below. ref

The height of 1 em is usually 16 pixels.

The em is a unit of measure from the field of printed type, and is equal to the width of the letter M. ref

HTML element	rank	example text	default stylesheet	pixel height
<h1> </h1>	1	h1	font-size: 2em font-weight: bolder	32 px
<h2> </h2>	2	h2	font-size: 1.5em font-weight: bolder	24 px
<h3> </h3>	3	h3	font-size: 1.17em font-weight: bolder	18.72 px
<h4> </h4>	4	h4	font-size: 1em font-weight: bolder	16 px
<h5> </h5>	5	h5	font-size: .83em font-weight: bolder	13.28 px
<h6> </h6>	6	h6	font-size: .67em font-weight: bolder	10.72 px

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