HTML <h1>-<h6> Tags

The <h1> to <h6> elements are used to define six levels of HTML Headings, with <h1> being the highest (or most important) level and <h6> the least important one.

Each web page must have only one <h1> heading. As search engines use it to index the structure and content of web documents, be sure to include keywords in it.

Syntax

The <h1>-<h6> tags come in pairs, so the closing tag is required.

As the <h1> to <h6> tags are block-level elements, they always start on a new line and take up the full width available.

Example

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
  </head>
  <body>
    <h1>First-level heading</h1>
    <h2>Second-level heading</h2>
    <h3>Third-level heading</h3>
    <h4>Fourth-level heading</h4>
    <h5>Fifth-level heading</h5>
    <h6>Sixth-level heading</h6>
  </body>
</html>
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Result

The <h1>-<h6> elements must not be used to markup subheadings, subtitles, alternative titles, and taglines unless intended to be the heading for a new section or subsection.

As the align attribute is not supported in HTML5, use the CSS font-size and font-weight properties instead.

Attributes

Attribute	Value	Description
align	left right center justify	Defines the vertical alignment of the tag content. Not supported in HTML 5.

The <h1> to <h6> tags support the Global Attributes and the Event Attributes.

How to style <h1>-<h6> tag

Common properties to alter the visual weight/emphasis/size of text in <h1>-<h6> tag:?

CSS font-style property sets the style of the font. normal | italic | oblique | initial | inherit
CSS font-family property specifies a prioritized list of one or more font family names and/or generic family names for the selected element.
CSS font-size property sets the size of the font.
CSS font-weight property defines whether the font should be bold or thick. CSS text-transform Property controls text case and capitalization.
CSS text-decoration property specifies the decoration added to text, and is a shorthand property for text-decoration-line, text-decoration-color, text-decoration-style

Coloring text in <h1>-<h6> tag:

CSS color property describes the color of the text content and text decorations
CSS background-color property sets the background color of an element.

Text layout styles for <h1>-<h6> tag:

CSS text-indent property specifies the indentation of the first line in a text block.
CSS text-overflow property specifies how overflowed content that is not displayed should be signaled to the user.
CSS white-space property specifies how white-space inside an element is handled.
CSS word-break property specifies where the lines should be broken.

Other properties worth looking at for <h1>-<h6> tag

CSS text-shadow property adds shadow to text.
CSS text-align-last property sets the alignment of the last line of the text.
CSS line-height property specifies the height of a line.
CSS letter-spacing property defines the spaces between letters/characters in a text.
CSS word-spacing property: Allow setting the spacing between words.

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