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HTML <optgroup> style Attribute

HTML <ol>

HTML <option>

A style attribute on an <optgroup> tag assigns a unique style to the option group.

Its value is CSS that defines the appearance of the option group.

Example

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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

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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

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<optgroup style="CSS-styles">

Values

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

More Examples

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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

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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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