HTML <optgroup> style Attribute

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

Example

#

A style attribute on an <optgroup> element.

<select>
  <option value="">-- Select city -- </option>
  <optgroup label="Europe" style="color: teal; font-size: 16px;">
    <option value="stockholm">Stockholm</option>
    <option value="barcelona">Barcelona</option>
    <option value="athens">Athens</option>
  </optgroup>
</select>

Using style

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


Syntax

<optgroup style="CSS-styles">

Values

#

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

More Examples

A style attribute on an <optgroup> element.
Clicking the button toggles the font color of the option group.


<select>
  <option value="">-- Select city -- </option>
  <optgroup id="myoptgroup" label="Europe" style="color: teal; font-size: 16px;">
    <option value="stockholm">Stockholm</option>
    <option value="barcelona">Barcelona</option>
    <option value="athens">Athens</option>
  </optgroup>
</select>

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

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

    if (element.style.color === "teal") {
       element.style.color = "tomato";
    } else {
       element.style.color = "teal";
    }
  }
</script>

Code explanation

The style attribute assigns a text color and size to the <optgroup> element.

Clicking the button calls JavaScript which toggles the text color to another color.


Browser support

Here is when style support started for each browser:

Chrome
1.0 Sep 2008
Firefox
1.0 Sep 2002
IE/Edge
1.0 Aug 1995
Opera
1.0 Jan 2006
Safari
1.0 Jan 2003

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