HTML <main> style Attribute

The style attribute on a <main> tag assigns a unique style to the main element. A style contains one or more CSS property/value pairs that define the appearance of the main element.

Example

#

A style attribute on a <main> element.

Impressionism is a 19th-century art movement characterized by relatively small brush strokes, emphasis on accurate depiction of light, ordinary subject matter, and unusual visual angles. Impressionism originated with a group of Paris-based artists whose independent exhibitions brought them to prominence in the 1870s and 1880s.
<main style="max-width: 400px; background:#f6f8ff; padding:25px;">
  <b>Impressionism</b> is a 19th-century art movement 
  characterized by relatively small brush strokes, 
  emphasis on accurate depiction of light, ordinary
  subject  matter, and unusual visual angles. 
  Impressionism originated  with a group of 
  Paris-based artists whose independent exhibitions 
  brought them to prominence in the 1870s and 1880s.
</main>

Using style

The style attribute specifies the style, i.e. look and feel, of the <main> element.

A style contains any number of CSS property/value pairs, separated by semicolons (;).

The style attribute overrides any other style that was defined in a <style> tag or an external CSS file.

This inline styling affects the current <main> element only.


Syntax

<main style="CSS-styles">

Values

#

Value Description
CSS-styles One or more CSS property/value pairs separated by semicolons (;).

More Examples

A style attribute on a <main> element.
Clicking the button toggles the max width value.

Impressionism is a 19th-century art movement characterized by relatively small brush strokes, emphasis on accurate depiction of light, ordinary subject matter, and unusual visual angles. Impressionism originated with a group of Paris-based artists whose independent exhibitions brought them to prominence in the 1870s and 1880s.

<main id="mymain" 
      style="max-width: 400px;background:#f6f8ff; padding:25px;">
  <b>Impressionism</b> is a 19th-century art movement 
  characterized by relatively small brush strokes, 
  emphasis on accurate depiction of light, ordinary
  subject  matter, and unusual visual angles. 
  Impressionism originated  with a group of 
  Paris-based artists whose independent exhibitions 
  brought them to prominence in the 1870s and 1880s.
</main>

<br />
<button onclick="toggle();">Toggle style</button>

<script>
  let toggle = () => {
    let element = document.getElementById("mymain");

    if (element.style.maxWidth === "400px") {
       element.style.maxWidth = "100%";
    } else {
       element.style.maxWidth = "400px";
    }
  }
</script>

Code explanation

The style attribute sets the <main> element maximum width.

Clicking the button calls JavaScript which changes the maximum width.


Browser support

Here is when style support started for each browser:

Chrome
6.0 Sep 2010
Firefox
4.0 Mar 2011
IE/Edge
12.0 Jul 2015
Opera
11.1 Mar 2011
Safari
5.0 Jun 2010

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